release of 4.5.1

[xboard.git] / manual / xboard.txt

INFO-DIR-SECTION Games
START-INFO-DIR-ENTRY
* xboard: (xboard).         An X Window System graphical chessboard.
END-INFO-DIR-ENTRY

Introduction
************

XBoard is a graphical chessboard that can serve as a user interface to
chess engines (such as GNU Chess), the Internet Chess Servers,
electronic mail correspondence chess, or your own collection of saved
games.

   This manual documents version 4.5.1 of XBoard.

1 Major modes
*************

XBoard always runs in one of four major modes.  You select the major
mode from the command line when you start up XBoard.

xboard [options]
     As an interface to GNU Chess or another chess engine running on
     your machine, XBoard lets you play a game against the machine, set
     up arbitrary positions, force variations, watch a game between two
     chess engines, interactively analyze your stored games or set up
     and analyze arbitrary positions.  (Note: Not all chess engines
     support analysis.)

xboard -ics -icshost hostname [options]
     As Internet Chess Server (ICS) interface, XBoard lets you play
     against other ICS users, observe games they are playing, or review
     games that have recently finished.  Most of the ICS "wild" chess
     variants are supported, including bughouse.

xboard -ncp [options]
     XBoard can also be used simply as an electronic chessboard to play
     through games. It will read and write game files and allow you to
     play through variations manually. You can use it to browse games
     off the net or review games you have saved.  These features are
     also available in the other modes.

|pxboard
     If you want to pipe games into XBoard, use the supplied shell
     script `pxboard'.  For example, from the news reader `xrn', find a
     message with one or more games in it, click the Save button, and
     type `|pxboard' as the file name.

cmail [options]
     As an interface to electronic mail correspondence chess, XBoard
     works with the cmail program. See *note CMail:: below for
     instructions.

2 Menus, buttons, and keys
**************************

To move a piece, you can drag it with the left mouse button, or you can
click the left mouse button once on the piece, then once more on the
destination square.  To drop a new piece on a square (when applicable),
press the middle or the right mouse button over the square and select
from the pop-up menu.  In cases where you can drop either a white or
black piece, use the middle button (or shift+right) for white and the
right button (or shift+middle) for black.  When you are playing a
bughouse game on an Internet Chess Server, a list of the off-board
pieces that each player has available is shown in the window title
after the player's name; in addition, the piece menus show the number
of pieces available of each type. From version 4.3.14 on, it is also
possible in crazyhouse, bughouse or shogi to drag and drop pieces to
the board from the holdings squares displayed next to the board.  This
latter method for dropping pieces during a game is preferred, and the
piece-drop menu is now deprecated (except for editing a position).
Although the old behavior can still be selected through a command-line
option, the default function of the right mouse button is to display
the position the chess program thinks it will end up in, while moving
the mouse vertically with this button pressed will step through the
principal variation to show how this position will be reached.  Lines
of play displayed in the engine-output window an similarly be played
out on the board, by right-clicking on them.

   When connected to an ICS, it is possible to call up a graphical
representation of players seeking a game in stead of the chess board,
when the latter is not in use (i.e. when you are not playing or
observing).  Left-clicking the display area will switch between this
'seek graph' and the chess board.  Hovering the mouse pointer over a
dot will show the details of the seek ad in the message field above the
board.  Left-clicking the dot will challenge that player.
Right-clicking a dot will 'push it to the back', to reveal any dots
that were hidden behind it.  Right-clicking off dots will refresh the
graph.

   Most other XBoard commands are available from the menu bar. The most
frequently used commands also have shortcut keys or on-screen buttons.
Some rarely used parameters can only be set through options on the
command line used to invoke XBoard.

   XBoard uses a settings file, in which it can remember any changes to
the settings that are made through menus or command-line options, so
they will still apply when you restart XBoard for another session.  The
settings can be saved into this file automatically when XBoard exits,
or on explicit request of the user.  The default name for the settings
file is /etc/xboard/xboard.conf, but in a standard install this file is
only used as a master settings file that determines the system-wide
default settings, and defers reading and writing of user settings to a
user-specific file like ~/.xboardrc in the user's home directory.

   When XBoard is iconized, its graphical icon is a white knight if it
is White's turn to move, a black knight if it is Black's turn.  See
Iconize in *note Keys:: below if you have problems getting this feature
to work.

2.1 File Menu
=============

New Game
     Resets XBoard and the chess engine to the beginning of a new chess
     game. The `Ctrl-N' key is a keyboard equivalent. In Internet Chess
     Server mode, clears the current state of XBoard, then
     resynchronizes with the ICS by sending a refresh command. If you
     want to stop playing, observing, or examining an ICS game, use an
     appropriate command from the Action menu, not `New Game'.  *Note
     Action Menu::.

New Shuffle Game
     Similar to `New Game', but allows you to specify a particular
     initial position (according to a standardized numbering system) in
     chess variants which use randomized opening positions (e.g.
     Chess960).  The selected opening position will persistently be
     chosen on any following New Game command until you use this menu
     to select another. Selecting position number -1 will produce a
     newly randomized position on any new game.  Using this menu item
     in variants that normally do not shuffle their opening position
     does cause these variants to become shuffle variants until you use
     the `New Shuffle Game' menu to explicitly switch the randomization
     off, or select a new variant.

New Variant
     Allows you to select a new chess variant in non-ICS mode.  (In ICS
     play, the ICS is responsible for deciding which variant will be
     played, and XBoard adapts automatically.)  The shifted `Alt+V' key
     is a keyboard equivalent. If you play with an engine, the engine
     must be able to play the selected variant, or the command will be
     ignored.  XBoard supports all major variants, such as xiangqi,
     shogi, chess, chess960, Capablanca Chess, shatranj, crazyhouse,
     bughouse.  (But not every board size has built-in bitmaps for
     un-orthodox pieces!)

Load Game
     Plays a game from a record file. The `Ctrl-O' key is a keyboard
     equivalent.  A pop-up dialog prompts you for the file name. If the
     file contains more than one game, a second pop-up dialog displays
     a list of games (with information drawn from their PGN tags, if
     any), and you can select the one you want. Alternatively, you can
     load the Nth game in the file directly, by typing the number `N'
     after the file name, separated by a space.

     The game file parser will accept PGN (portable game notation), or
     in fact almost any file that contains moves in algebraic notation.
     Notation of the form `P@f7' is accepted for piece-drops in
     bughouse games; this is a nonstandard extension to PGN.  If the
     file includes a PGN position (FEN tag), or an old-style XBoard
     position diagram bracketed by `[--' and `--]' before the first
     move, the game starts from that position. Text enclosed in
     parentheses, square brackets, or curly braces is assumed to be
     commentary and is displayed in a pop-up window. Any other text in
     the file is ignored. PGN variations (enclosed in parentheses) also
     are treated as comments; however, if you rights-click them in the
     comment window, XBoard will shelve the current line, and load the
     the selected variation, so you can step through it.  You can later
     revert to the previous line with the `Revert' command.  This way
     you can walk quite complex varation trees with XBoard.  The
     nonstandard PGN tag [Variant "varname"] functions similarly to the
     -variant command-line option (see below), allowing games in
     certain chess variants to be loaded.  Note that it must appear
     before any FEN tag for XBoard to recognize variant FENs
     appropriately.  There is also a heuristic to recognize chess
     variants from the Event tag, by looking for the strings that the
     Internet Chess Servers put there when saving variant ("wild")
     games.

Load Position
     Sets up a position from a position file.  A pop-up dialog prompts
     you for the file name.  The shifted `Ctrl-O' key is a keyboard
     equivalent. If the file contains more than one saved position, and
     you want to load the Nth one, type the number N after the file
     name, separated by a space. Position files must be in FEN
     (Forsythe-Edwards notation), or in the format that the Save
     Position command writes when oldSaveStyle is turned on.

Load Next Position
     Loads the next position from the last position file you loaded.
     The shifted `PgDn' key is a keyboard equivalent.

Load Previous Position
     Loads the previous position from the last position file you
     loaded. The shifted `PgUp' key is a keyboard equivalent.  Not
     available if the last position was loaded from a pipe.

Save Game
     Appends a record of the current game to a file.  The `Ctrl-S' key
     is a keyboard equivalent.  A pop-up dialog prompts you for the
     file name. If the game did not begin with the standard starting
     position, the game file includes the starting position used. Games
     are saved in the PGN (portable game notation) format, unless the
     oldSaveStyle option is true, in which case they are saved in an
     older format that is specific to XBoard. Both formats are
     human-readable, and both can be read back by the `Load Game'
     command.  Notation of the form `P@f7' is accepted for piece-drops
     in bughouse games; this is a nonstandard extension to PGN.

Save Position
     Appends a diagram of the current position to a file.  The shifted
     `Ctrl+S' key is a keyboard equivalent.  A pop-up dialog prompts
     you for the file name. Positions are saved in FEN
     (Forsythe-Edwards notation) format unless the `oldSaveStyle'
     option is true, in which case they are saved in an older,
     human-readable format that is specific to XBoard. Both formats can
     be read back by the `Load Position' command.

Mail Move
Reload CMail Message
     See *note CMail::.

Exit
     Exits from XBoard. The `Ctrl-Q' key is a keyboard equivalent.

2.2 Edit Menu
=============

Copy Game
     Copies a record of the current game to an internal clipboard in PGN
     format and sets the X selection to the game text. The `Ctrl-C' key
     is a keyboard equivalent. The game can be pasted to another
     application (such as a text editor or another copy of XBoard)
     using that application's paste command.  In many X applications,
     such as xterm and emacs, the middle mouse button can be used for
     pasting; in XBoard, you must use the Paste Game command.

Copy Position
     Copies the current position to an internal clipboard in FEN format
     and sets the X selection to the position text. The shifted
     `Ctrl-C' key is a keyboard equivalent.  The position can be pasted
     to another application (such as a text editor or another copy of
     XBoard) using that application's paste command.  In many X
     applications, such as xterm and emacs, the middle mouse button can
     be used for pasting; in XBoard, you must use the Paste Position
     command.

Paste Game
     Interprets the current X selection as a game record and loads it,
     as with Load Game. The `Ctrl-V' key is a keyboard equivalent.

Paste Position
     Interprets the current X selection as a FEN position and loads it,
     as with Load Position. The shifted `Ctrl-V' key is a keyboard
     equivalent.

Edit Game
     Allows you to make moves for both Black and White, and to change
     moves after backing up with the `Backward' command. The clocks do
     not run. The `Ctrl-E' key is a keyboard equivalent.

     In chess engine mode, the chess engine continues to check moves
     for legality but does not participate in the game. You can bring
     the chess engine into the game by selecting `Machine White',
     `Machine Black', or `Two Machines'.

     In ICS mode, the moves are not sent to the ICS: `Edit Game' takes
     XBoard out of ICS Client mode and lets you edit games locally.  If
     you want to edit games on ICS in a way that other ICS users can
     see, use the ICS `examine' command or start an ICS match against
     yourself.

Edit Position
     Lets you set up an arbitrary board position.  The shifted `Ctrl-E'
     key is a keyboard equivalent.  Use mouse button 1 to drag pieces
     to new squares, or to delete a piece by dragging it off the board
     or dragging an empty square on top of it.  To drop a new piece on
     a square, press mouse button 2 or 3 over the square. This brings
     up a menu of white pieces (button 2) or black pieces (button 3).
     Additional menu choices let you empty the square or clear the
     board. You can set the side to play next by clicking on the word
     White or Black at the top of the screen.  Selecting `Edit
     Position' causes XBoard to discard all remembered moves in the
     current game.

     In ICS mode, changes made to the position by `Edit Position' are
     not sent to the ICS: `Edit Position' takes XBoard out of `ICS
     Client' mode and lets you edit positions locally. If you want to
     edit positions on ICS in a way that other ICS users can see, use
     the ICS `examine' command, or start an ICS match against yourself.
     (See also the ICS Client topic above.)

Edit Tags
     Lets you edit the PGN (portable game notation) tags for the
     current game. After editing, the tags must still conform to the
     PGN tag syntax:

          <tag-section> ::= <tag-pair> <tag-section>
                                  <empty>
          <tag-pair> ::= [ <tag-name> <tag-value> ]
          <tag-name> ::= <identifier>
          <tag-value> ::= <string>
     See the PGN Standard for full details. Here is an example:

          [Event "Portoroz Interzonal"]
          [Site "Portoroz, Yugoslavia"]
          [Date "1958.08.16"]
          [Round "8"]
          [White "Robert J. Fischer"]
          [Black "Bent Larsen"]
          [Result "1-0"]
     Any characters that do not match this syntax are silently ignored.
     Note that the PGN standard requires all games to have at least the
     seven tags shown above. Any that you omit will be filled in by
     XBoard with `?' (unknown value), or `-' (inapplicable value).

Edit Comment
     Adds or modifies a comment on the current position. Comments are
     saved by `Save Game' and are displayed by `Load Game', `Forward',
     and `Backward'.

Revert
Annotate
     If you are examining an ICS game and Pause mode is off, Revert
     issues the ICS command `revert'.  In local mode, when you were
     editing or analyzing a game, and the `-variations' command-line
     option is switched on, you can start a new variation by holding
     the Shift key down while entering a move not at the end of the
     game.  Variations can also become the currently displayed line by
     clicking a PGN variation displayed in the Comment window.  This
     can be applied recursively, so that you can analyze variations on
     variations; each time you create a new variation by entering an
     alternative move with Shift pressed, or select a new one from the
     Comment window, the current variation will be shelved.  `Revert'
     allows you to return to the most recently shelved variation.  The
     difference between `Revert' and `Annotate' is that with the latter,
     the variation you are now abandoning will be added as a comment
     (in PGN variation syntax, i.e. between parentheses) to the
     original move where you deviated, for later recalling.  The `Home'
     key is a keyboard equivalent to `Revert'.

Truncate Game
     Discards all remembered moves of the game beyond the current
     position. Puts XBoard into `Edit Game' mode if it was not there
     already.  The `End' key is a keyboard equivalent.

Backward
     Steps backward through a series of remembered moves.  The `[<]'
     button and the `Alt+LeftArrow' key are equivalents, as is turning
     the mouse wheel towards you.  In addition, pressing the Control
     key steps back one move, and releasing it steps forward again.

     In most modes, `Backward' only lets you look back at old positions;
     it does not retract moves. This is the case if you are playing
     against a chess engine, playing or observing a game on an ICS, or
     loading a game.  If you select `Backward' in any of these
     situations, you will not be allowed to make a different move. Use
     `Retract Move' or `Edit Game' if you want to change past moves.

     If you are examining an ICS game, the behavior of `Backward'
     depends on whether XBoard is in Pause mode. If Pause mode is off,
     `Backward' issues the ICS backward command, which backs up
     everyone's view of the game and allows you to make a different
     move. If Pause mode is on, `Backward' only backs up your local
     view.

Forward
     Steps forward through a series of remembered moves (undoing the
     effect of `Backward') or forward through a game file. The `[>]'
     button and the `Alt+RightArrow' key are equivalents, as is turning
     the mouse wheel away from you.

     If you are examining an ICS game, the behavior of Forward depends
     on whether XBoard is in Pause mode. If Pause mode is off,
     `Forward' issues the ICS forward command, which moves everyone's
     view of the game forward along the current line. If Pause mode is
     on, `Forward' only moves your local view forward, and it will not
     go past the position that the game was in when you paused.

Back to Start
     Jumps backward to the first remembered position in the game.  The
     `[<<]' button and the `Alt+Home' key are equivalents.

     In most modes, Back to Start only lets you look back at old
     positions; it does not retract moves. This is the case if you are
     playing against a local chess engine, playing or observing a game
     on a chess server, or loading a game. If you select `Back to
     Start' in any of these situations, you will not be allowed to make
     different moves. Use `Retract Move' or `Edit Game' if you want to
     change past moves; or use Reset to start a new game.

     If you are examining an ICS game, the behavior of `Back to Start'
     depends on whether XBoard is in Pause mode. If Pause mode is off,
     `Back to Start' issues the ICS `backward 999999' command, which
     backs up everyone's view of the game to the start and allows you
     to make different moves. If Pause mode is on, `Back to Start' only
     backs up your local view.

Forward to End
     Jumps forward to the last remembered position in the game. The
     `[>>]' button and the `Alt+End' key are equivalents.

     If you are examining an ICS game, the behavior of `Forward to End'
     depends on whether XBoard is in Pause mode. If Pause mode is off,
     `Forward to End' issues the ICS `forward 999999' command, which
     moves everyone's view of the game forward to the end of the
     current line. If Pause mode is on, `Forward to End' only moves
     your local view forward, and it will not go past the position that
     the game was in when you paused.

2.3 View Menu
=============

Flip View
     Inverts your view of the chess board for the duration of the
     current game. Starting a new game returns the board to normal.
     The `F2' key is a keyboard equivalent.

Show Engine Output
     Shows or hides a window in which the thinking output of any loaded
     engines is displayed. The shifted `Alt+O' key is a keyboard
     equivalent.  XBoard will display lines of thinking output of the
     same depth ordered by score, (highest score on top), rather than
     in the order the engine produced them.  Usually this amounts to
     the same, as a normal engine search will only find new PV (and
     emit it as thinking output) when it searches a move with a higher
     score than the previous variation.  But when the engine is in
     multi-variation mode this needs not always be true, and it is more
     convenient for someone analyzing games to see the moves sorted by
     score.  The order in which the engine found them is only of
     interest to the engine author, and can still be deduced from the
     time or node count printed with the line.

Show Move History
     Shows or hides a list of moves of the current game.  The shifted
     `Alt+H' key is a keyboard equivalent.  This list allows you to
     move the display to any earlier position in the game by clicking
     on the corresponding move.

Show Evaluation Graph
     Shows or hides a window which displays a graph of how the engine
     score(s) evolved as a function of the move number.  The shifted
     `Alt+E' key is a keyboard equivalent.  Clicking on the graph will
     bring the corresponding position in the board display.

Show Game List
     Shows or hides the list of games generated by the last `Load Game'
     command. The shifted `Alt+G' key is a keyboard equivalent.

Tags
     Pops up a window which shows the PGN (portable game notation) tags
     for the current game.  For now this is a duplicate of the `Edit
     Tags' item in the `Edit' menu.

Comments
     Pops up a window which shows any comments to or variations on the
     current move.  For now this is a duplicate of the `Edit Comment'
     item in the `Edit' menu.

ICS Input Box
     If this option is set in ICS mode, XBoard creates an extra window
     that you can use for typing in ICS commands.  The input box is
     especially useful if you want to type in something long or do some
     editing on your input, because output from ICS doesn't get mixed
     in with your typing as it would in the main terminal window.

2.4 Mode Menu
=============

Machine White
     Tells the chess engine to play White.  The `Ctrl-W' key is a
     keyboard equivalent.

Machine Black
     Tells the chess engine to play Black.  The `Ctrl-B' key is a
     keyboard equivalent.

Two Machines
     Plays a game between two chess engines.  The `Ctrl-T' key is a
     keyboard equivalent.

Analysis Mode
     XBoard tells the chess engine to start analyzing the current
     game/position and shows you the analysis as you move pieces around.
     The `Ctrl-A' key is a keyboard equivalent.  Note: Some chess
     engines do not support Analysis mode.

     To set up a position to analyze, you do the following:

     1. Select Edit Position from the Mode Menu

     2. Set up the position.  Use the middle and right buttons to bring
     up the white and black piece menus.

     3. When you are finished, click on either the Black or White clock
     to tell XBoard which side moves first.

     4. Select Analysis Mode from the Mode Menu to start the analysis.

     The analysis function can also be used when observing games on an
     ICS with an engine loaded (zippy mode); the engine then will
     analyse the positions as they occur in the observed game.

Analyze File
     This option lets you load a game from a file (PGN, XBoard format,
     etc.)  and analyze it. The `Ctrl-F' key is a keyboard equivalent.
     When you select this menu item, a pop-up window appears and asks
     for a file name to load.  If the file contains multiple games,
     another pop up appears that lets you select which game you wish to
     analyze.  After a game is loaded, XBoard will start auto-playing
     the game, while the engine is analyzing the current position.  The
     game will be annotated with the results of these analyses.  In
     particlar, the score and depth will be added as a comment, and the
     PV will be added as a variation.  The time the engine spends on
     analyzing each move can be controlled through the command-line
     option `-timeDelay'.  Note: Some chess engines do not support
     Analysis mode.

Edit Game
     Duplicate of the item in the Edit menu.  Note that `Edit Game' is
     the idle mode of XBoard, and can be used to get you out of other
     modes. E.g. to stop analyzing, stop a game between two engines or
     stop editing a position.

Edit Position
     Duplicate of the item in the Edit menu.

Training
     Training mode lets you interactively guess the moves of a game for
     one of the players. You guess the next move of the game by playing
     the move on the board. If the move played matches the next move of
     the game, the move is accepted and the opponent's response is
     auto-played.  If the move played is incorrect, an error message is
     displayed.  You can select this mode only while loading a game
     (that is, after selecting `Load Game' from the File menu).  While
     XBoard is in `Training' mode, the navigation buttons are disabled.

ICS Client
     This is the normal mode when XBoard is connected to a chess
     server.  If you have moved into Edit Game or Edit Position mode,
     you can select this option to get out.

     To use xboard in ICS mode, run it in the foreground with the -ics
     option, and use the terminal you started it from to type commands
     and receive text responses from the chess server.  See *note Chess
     Servers:: below for more information.

     XBoard activates some special position/game editing features when
     you use the `examine' or `bsetup' commands on ICS and you have
     `ICS Client' selected on the Mode menu.  First, you can issue the
     ICS position-editing commands with the mouse.  Move pieces by
     dragging with mouse button 1.  To drop a new piece on a square,
     press mouse button 2 or 3 over the square.  This brings up a menu
     of white pieces (button 2) or black pieces (button 3).  Additional
     menu choices let you empty the square or clear the board.  Click
     on the White or Black clock to set the side to play.  You cannot
     set the side to play or drag pieces to arbitrary squares while
     examining on ICC, but you can do so in `bsetup' mode on FICS.  In
     addition, the menu commands `Forward', `Backward', `Pause', and
     `Stop Examining' have special functions in this mode; see below.

Pause
     Pauses updates to the board, and if you are playing against a
     chess engine, also pauses your clock. To continue, select `Pause'
     again, and the display will automatically update to the latest
     position.  The `P' button and keyboard `Pause' key are equivalents.

     If you select Pause when you are playing against a chess engine and
     it is not your move, the chess engine's clock will continue to run
     and it will eventually make a move, at which point both clocks
     will stop. Since board updates are paused, however, you will not
     see the move until you exit from Pause mode (or select Forward).
     This behavior is meant to simulate adjournment with a sealed move.

     If you select Pause while you are observing or examining a game on
     a chess server, you can step backward and forward in the current
     history of the examined game without affecting the other observers
     and examiners, and without having your display jump forward to the
     latest position each time a move is made. Select Pause again to
     reconnect yourself to the current state of the game on ICS.

     If you select `Pause' while you are loading a game, the game stops
     loading. You can load more moves manually by selecting `Forward',
     or resume automatic loading by selecting `Pause' again.

2.5 Action Menu
===============

Accept
     Accepts a pending match offer.  The `F3' key is a keyboard
     equivalent.  If there is more than one offer pending, you will
     have to type in a more specific command instead of using this menu
     choice.

Decline
     Declines a pending offer (match, draw, adjourn, etc.).  The `F4'
     key is a keyboard equivalent. If there is more than one offer
     pending, you will have to type in a more specific command instead
     of using this menu choice.

Call Flag
     Calls your opponent's flag, claiming a win on time, or claiming a
     draw if you are both out of time.  The `F5' key is a keyboard
     equivalent.  You can also call your opponent's flag by clicking on
     his clock.

Draw
     Offers a draw to your opponent, accepts a pending draw offer from
     your opponent, or claims a draw by repetition or the 50-move rule,
     as appropriate. The `F6' key is a keyboard equivalent.

Adjourn
     Asks your opponent to agree to adjourning the current game, or
     agrees to a pending adjournment offer from your opponent.  The
     `F7' key is a keyboard equivalent.

Abort
     Asks your opponent to agree to aborting the current game, or
     agrees to a pending abort offer from your opponent.  The `F8' key
     is a keyboard equivalent. An aborted game ends immediately without
     affecting either player's rating.

Resign
     Resigns the game to your opponent. The `F9' key is a keyboard
     equivalent.

Stop Observing
     Ends your participation in observing a game, by issuing the ICS
     observe command with no arguments. ICS mode only.  The `F10' key
     is a keyboard equivalent.

Stop Examining
     Ends your participation in examining a game, by issuing the ICS
     unexamine command. ICS mode only.  The `F11' key is a keyboard
     equivalent.

Upload to Examine
     Create an examined game of the proper variant on the ICS, and send
     the game there that is currenty loaded in XBoard (e.g. through
     pasting or loading from file).  You must be connected to an ICS
     for this to work.

Adjudicate to White
Adjudicate to Black
Adjudicate Draw
     Terminate an ongoing game in Two-Machines mode (including match
     mode), with as result a win for white, for black, or a draw,
     respectively.  The PGN file of the game will accompany the result
     string by the comment "user adjudication".

2.6 Engine Menu
===============

Engine #N Settings
     Pop up a menu dialog to alter the settings specific to the
     applicable engine.  (The second engine is only accessible once it
     has been used in Two-Machines mode.)  For each parameter the
     engine allows to be set, a control element will appear in this
     dialog that can be used to alter the value.  Depending on the type
     of parameter (text string, number, multiple choice, on/off switch,
     instantaneous signal) the appropriate control will appear, with a
     description next to it.  XBoard has no idea what these values
     mean; it just passes them on to the engine.  How this dialog looks
     is completely determined by the engine, and XBoard just passes it
     on to the user.  Many engines do not have any parameters that can
     be set by the user, and in that case the dialog will be empty
     (except for the OK and cancel buttons).  UCI engines usually have
     many parameters. (But these are only visible with a sufficiently
     modern version of the Polyglot adapter needed to run UCI engines,
     e.g. Polyglot 1.4.55b.) For native XBoard engines this is less
     common.

Hint
     Displays a move hint from the chess engine.

Book
     Displays a list of possible moves from the chess engine's opening
     book.  The exact format depends on what chess engine you are using.
     With GNU Chess 4, the first column gives moves, the second column
     gives one possible response for each move, and the third column
     shows the number of lines in the book that include the move from
     the first column. If you select this option and nothing happens,
     the chess engine is out of its book or does not support this
     feature.

Move Now
     Forces the chess engine to move immediately. Chess engine mode
     only.  The `Ctrl-M' key is a keyboard equivalent.

Retract Move
     Retracts your last move. In chess engine mode, you can do this only
     after the chess engine has replied to your move; if the chess
     engine is still thinking, use `Move Now' first. In ICS mode,
     `Retract Move' issues the command `takeback 1' or `takeback 2'
     depending on whether it is your opponent's move or yours.  The
     `Ctrl-X' key is a keyboard equivalent.

2.7 Options Menu
================

Time Control
     Pops up a sub-menu where you can set the time-control parameters
     interactively.  Allows you to select classical or incremental time
     controls, set the moves per session, session duration, and time
     increment.  Also allows specification of time-odds factors for one
     or both engines.  If an engine is given a time-odds factor N, all
     time quota it gets, be it at the beginning of a session or through
     the time increment or fixed time per move, will be divided by N.
     The shifted `Alt+T' key is a keyboard equivalent.

Common Engine
     Pops up a sub-menu where you can set some engine parameters common
     to most engines, such as hash-table size, tablebase cache size,
     maximum number of processors that SMP engines can use, and where
     to find the Polyglot adapter needed to run UCI engines under
     XBoard. The feature that allows setting of these parameters on
     engines is new since XBoard 4.3.15, so not many XBoard/WinBoard
     engines respond to it yet, but UCI engines should.  It is also
     possible to specify a GUI opening book here, i.e. an opening book
     that XBoard consults for any position a playing engine gets in.
     It then forces the engine to play the book move, rather than to
     think up its own, if that position is found in the book.  The book
     can switched on and off independently for either engine.  The
     shifted `Alt+U' key is a keyboard equivalent.

Adjudications
     Pops up a sub-menu where you can enable or disable various
     adjudications that XBoard can perform in engine-engine games.  The
     shifted `Alt+J' key is a keyboard equivalent.  You can instruct
     XBoard to detect and terminate the game on checkmate or stalemate,
     even if the engines would not do so, to verify engine result
     claims (forfeiting engines that make false claims), rather than
     naively following the engine, to declare draw on positions which
     can never be won for lack of mating material, (e.g. KBK), or which
     are impossible to win unless the opponent seeks its own demise
     (e.g. KBKN).  For these adjudications to work, `Test Legality'
     should be switched on.  It is also possible to instruct XBoard to
     enforce a 50-move or 3-fold-repeat rule and automatically declare
     draw (after a user-adjustable number of moves or repeats) even if
     the engines are prepared to go on.  It is also possible to have
     XBoard declare draw on games that seem to drag on forever, or
     adjudicate a loss if both engines agree (for 3 consecutive moves)
     that one of them is behind more than a user-adjustable score
     threshold.  For the latter adjudication to work, XBoard should be
     able to properly understand the engine's scores. To facilitate the
     latter, you can inform xboard here if the engines report scores
     from the viewpoint of white, or from that of their own color.

Game List
     Pops up a dialog where you can select the PGN tags that should
     appear on the lines in the game list, and their order.

Always Queen
     If this option is off, XBoard brings up a dialog box whenever you
     move a pawn to the last rank, asking what piece you want to
     promote it to. If the option is true, your pawns are always
     promoted to queens. Your opponent can still under-promote.  The
     shifted `Ctrl-Q' key is a keyboard equivalent.

Animate Dragging
     If Animate Dragging is on, while you are dragging a piece with the
     mouse, an image of the piece follows the mouse cursor.  If Animate
     Dragging is off, there is no visual feedback while you are
     dragging a piece, but if Animate Moving is on, the move will be
     animated when it is complete.

Animate Moving
     If Animate Moving is on, all piece moves are animated.  An image
     of the piece is shown moving from the old square to the new square
     when the move is completed (unless the move was already animated
     by Animate Dragging).  If Animate Moving is off, a moved piece
     instantly disappears from its old square and reappears on its new
     square when the move is complete.  The shifted `Ctrl-A' key is a
     keyboard equivalent.

Auto Comment
     If this option is on, any remarks made on ICS while you are
     observing or playing a game are recorded as a comment on the
     current move.  This includes remarks made with the ICS commands
     `say', `tell', `whisper', and `kibitz'.  Limitation: remarks that
     you type yourself are not recognized; XBoard scans only the output
     from ICS, not the input you type to it.

Auto Flag
     If this option is on and one player runs out of time before the
     other, XBoard will automatically call his flag, claiming a win on
     time.  The shifted `Ctrl-F' key is a keyboard equivalent.  In ICS
     mode, Auto Flag will only call your opponent's flag, not yours,
     and the ICS may award you a draw instead of a win if you have
     insufficient mating material.  In local chess engine mode, XBoard
     may call either player's flag and will not take material into
     account (?).

Auto Flip View
     If the Auto Flip View option is on when you start a game, the board
     will be automatically oriented so that your pawns move from the
     bottom of the window towards the top.

Auto Observe
     If this option is on and you add a player to your `gnotify' list
     on ICS, XBoard will automatically observe all of that player's
     games, unless you are doing something else (such as observing or
     playing a game of your own) when one starts.  The games are
     displayed from the point of view of the player on your gnotify
     list; that is, his pawns move from the bottom of the window
     towards the top.  Exceptions:  If both players in a game are on
     your gnotify list, if your ICS `highlight' variable is set to 0,
     or if the ICS you are using does not properly support observing
     from Black's point of view, you will see the game from White's
     point of view.

Auto Raise Board
     If this option is on, whenever a new game begins, the chessboard
     window is deiconized (if necessary) and raised to the top of the
     stack of windows.

Auto Save
     If this option is true, at the end of every game XBoard prompts
     you for a file name and appends a record of the game to the file
     you specify.  Disabled if the `saveGameFile' command-line option
     is set, as in that case all games are saved to the specified file.
     *Note Load and Save options::.

Blindfold
     If this option is on, XBoard displays the board as usual but does
     not display pieces or move highlights.  You can still move in the
     usual way (with the mouse or by typing moves in ICS mode), even
     though the pieces are invisible.

Flash Moves
     If this option is on, whenever a move is completed, the moved
     piece flashes.  The number of times to flash is set by the
     flashCount command-line option; it defaults to 3 if Flash Moves is
     first turned on from the menu.

     If you are playing a game on an ICS, the board is always oriented
     at the start of the game so that your pawns move from the bottom
     of the window towards the top. Otherwise, the starting orientation
     is determined by the `flipView' command line option; if it is
     false (the default), White's pawns move from bottom to top at the
     start of each game; if it is true, Black's pawns move from bottom
     to top. *Note User interface options::.

Get Move List
     If this option is on, whenever XBoard receives the first board of
     a new ICS game (or a different game from the one it is currently
     displaying), it retrieves the list of past moves from the ICS.
     You can then review the moves with the `Forward' and `Backward'
     commands or save them with `Save Game'.  You might want to turn
     off this option if you are observing several blitz games at once,
     to keep from wasting time and network bandwidth fetching the move
     lists over and over.  When you turn this option on from the menu,
     XBoard immediately fetches the move list of the current game (if
     any).

Highlight Dragging
     If Highlight Dragging is on, and the option -showTargetSquares is
     also on in the settings file, all squares a piece that is 'picked
     up' with the mouse can legally move to are highighted with a fat
     colored dot in the highlightColor (non-captures) or
     premoveHighlightColor (captures).  Legality testing must be on for
     XBoard to know how the piece moves.

Highlight Last Move
     If Highlight Last Move is on, after a move is made, the starting
     and ending squares remain highlighted. In addition, after you use
     Backward or Back to Start, the starting and ending squares of the
     last move to be unmade are highlighted.

Highlight with Arrow
     Causes the highlighting described in Highlight Last Move to be done
     by drawing an arrow between the highlighted squares, so that it is
     visible even when the width of the grid lines is set to zero.

Move Sound
     If this option is on, XBoard alerts you by playing a sound after
     each of your opponent's moves (or after every move if you are
     observing a game on the Internet Chess Server).  The sound is not
     played after moves you make or moves read from a saved game file.
     By default, the sound is the terminal bell, but on some systems
     you can change it to a sound file using the soundMove option; see
     below.

     If you turn on this option when using XBoard with the Internet
     Chess Server, you will probably want to give the `set bell 0'
     command to the ICS, since otherwise the ICS will ring the terminal
     bell after every move (not just yours). (The `.icsrc' file is a
     good place for this; see *note ICS options::.)

ICS Alarm
     When this option is on, an alarm sound is played when your clock
     counts down to the icsAlarmTime (by default, 5 seconds) in an ICS
     game.  For games with time controls that include an increment, the
     alarm will sound each time the clock counts down to the
     icsAlarmTime.  By default, the alarm sound is the terminal bell,
     but on some systems you can change it to a sound file using the
     soundIcsAlarm option; see below.

One-Click Moving
     If this option is on, XBoard does not wait for you to click both
     the from- and the to-square, or drag the piece, but performs a
     move as soon as it is uniqely specified.  This applies to clicking
     an own piece that only has a single legal move, clicking an empty
     square or opponent piece where only one of your pieces can move
     (or capture) to.  Furthermore, a double-click on a piece that can
     only make a single capture will cause that capture to be made.
     Promoting a Pawn by clicking its to-square will suppress the
     promotion popup, and make it promote to Queen.

Periodic Updates
     If this option is off (or if you are using a chess engine that
     does not support periodic updates), the analysis window will only
     be updated when the analysis changes. If this option is on, the
     Analysis Window will be updated every two seconds.

Ponder Next Move
     If this option is off, the chess engine will think only when it is
     on move.  If the option is on, the engine will also think while
     waiting for you to make your move.  The shifted `Ctrl-P' key is a
     keyboard equivalent.

Popup Exit Message
     If this option is on, when XBoard wants to display a message just
     before exiting, it brings up a modal dialog box and waits for you
     to click OK before exiting.  If the option is off, XBoard prints
     the message to standard error (the terminal) and exits immediately.

Popup Move Errors
     If this option is off, when you make an error in moving (such as
     attempting an illegal move or moving the wrong color piece), the
     error message is displayed in the message area.  If the option is
     on, move errors are displayed in small pop-up windows like other
     errors.  You can dismiss an error pop-up either by clicking its OK
     button or by clicking anywhere on the board, including
     down-clicking to start a move.

Premove
     If this option is on while playing a game on an ICS, you can
     register your next planned move before it is your turn.  Move the
     piece with the mouse in the ordinary way, and the starting and
     ending squares will be highlighted with a special color (red by
     default).  When it is your turn, if your registered move is legal,
     XBoard will send it to ICS immediately; if not, it will be ignored
     and you can make a different move.  If you change your mind about
     your premove, either make a different move, or double-click on any
     piece to cancel the move entirely.

Quiet Play
     If this option is on, XBoard will automatically issue an ICS `set
     shout 0' command whenever you start a game and a `set shout 1'
     command whenever you finish one.  Thus, you will not be distracted
     by shouts from other ICS users while playing.

Show Coords
     If this option is on, XBoard displays algebraic coordinates along
     the board's left and bottom edges.

Hide Thinking
     If this option is off, the chess engine's notion of the score and
     best line of play from the current position is displayed as it is
     thinking. The score indicates how many pawns ahead (or if negative,
     behind) the chess engine thinks it is. In matches between two
     machines, the score is prefixed by `W' or `B' to indicate whether
     it is showing White's thinking or Black's, and only the thinking
     of the engine that is on move is shown.  The shifted `Ctrl-H' key
     is a keyboard equivalent.

Test Legality
     If this option is on, XBoard tests whether the moves you try to
     make with the mouse are legal and refuses to let you make an
     illegal move.  The shifted `Ctrl-L' key is a keyboard equivalent.
     Moves loaded from a file with `Load Game' are also checked.  If
     the option is off, all moves are accepted, but if a local chess
     engine or the ICS is active, they will still reject illegal moves.
     Turning off this option is useful if you are playing a chess
     variant with rules that XBoard does not understand.  (Bughouse,
     suicide, and wild variants where the king may castle after
     starting on the d file are generally supported with Test Legality
     on.)

Save Settings Now
     Selecting this menu item causes the current XBoard settings to be
     written to the settings file, so they will also apply in future
     sessions.  Note that some settings are 'volatile', and are not
     saved, because XBoard considers it too unlikely that you want
     those to apply next time.  In particular this applies to the Chess
     program names, and all options giving information on those Chess
     programs (such as their directory, if they have their own opening
     book, if they are UCI or native XBoard), or the variant you are
     playing.  Such options would still be understood when they appear
     in the settings file in case they were put there with the aid of a
     text editor, but they would disappear from the file as soon as you
     save the settings.

Save Settings on Exit
     Setting this option has no immediate effect, but causes the
     settings to be saved when you quit XBoard. What happens then is
     otherwise identical to what happens when you use select "Save
     Settings Now", see there.

2.8 Help Menu
=============

Info XBoard
     Displays the XBoard documentation in info format.  For this
     feature to work, you must have the GNU info program installed on
     your system, and the file `xboard.info' must either be present in
     the current working directory, or have been installed by the `make
     install' command when you built XBoard.

Man XBoard
     Displays the XBoard documentation in man page format.  The `F1'
     key is a keyboard equivalent.  For this feature to work, the file
     `xboard.6' must have been installed by the `make install' command
     when you built XBoard, and the directory it was placed in must be
     on the search path for your system's `man' command.

About XBoard
     Shows the current XBoard version number.

2.9 Other Shortcut Keys
=======================

Iconize
     Pressing the `-' key iconizes XBoard. The graphical icon displays
     a white knight if it is White's move, or a black knight if it is
     Black's move. If your X window manager displays only text icons,
     not graphical ones, check its documentation; there is probably a
     way to enable graphical icons.  If you get black and white
     reversed, we would like to hear about it; see *note Problems::
     below for instructions on how to report this problem.

Load Next Game
     Loads the next game from the last game record file you loaded.
     The `Alt+PgDn' key is a keyboard equivalent.

Load Previous Game
     Loads the previous game from the last game record file you loaded.
     The `Alt+PgUp' key is a keyboard equivalent.  Not available if the
     last game was loaded from a pipe.

Reload Same Game
     Reloads the last game you loaded.  Not available if the last game
     was loaded from a pipe.

Reload Same Position
     Reloads the last position you loaded.  Not available if the last
     position was loaded from a pipe.

   You can add or remove shortcut keys using the X resources
`form.translations'. Here is an example of what would go in your
`.Xresources' file:

     XBoard*form.translations: \
       Shift<Key>?: AboutGameProc() \n\
       <Key>y: AcceptProc() \n\
       <Key>n: DeclineProc() \n\
       <Key>i: NothingProc()
   Binding a key to `NothingProc' makes it do nothing, thus removing it
as a shortcut key. The XBoard commands that can be bound to keys are:

     AbortProc, AboutGameProc, AboutProc, AcceptProc, AdjournProc,
     AlwaysQueenProc, AnalysisModeProc, AnalyzeFileProc,
     AnimateDraggingProc, AnimateMovingProc, AutobsProc, AutoflagProc,
     AutoflipProc, AutoraiseProc, AutosaveProc, BackwardProc,
     BlindfoldProc, BookProc, CallFlagProc, CopyGameProc, CopyPositionProc,
     DebugProc, DeclineProc, DrawProc, EditCommentProc, EditGameProc,
     EditPositionProc, EditTagsProc, EnterKeyProc, FlashMovesProc,
     FlipViewProc, ForwardProc, GetMoveListProc, HighlightLastMoveProc,
     HintProc, Iconify, IcsAlarmProc, IcsClientProc, IcsInputBoxProc,
     InfoProc, LoadGameProc, LoadNextGameProc, LoadNextPositionProc,
     LoadPositionProc, LoadPrevGameProc, LoadPrevPositionProc,
     LoadSelectedProc, MachineBlackProc, MachineWhiteProc, MailMoveProc,
     ManProc, MoveNowProc, MoveSoundProc, NothingProc, OldSaveStyleProc,
     PasteGameProc, PastePositionProc, PauseProc, PeriodicUpdatesProc,
     PonderNextMoveProc, PopupExitMessageProc, PopupMoveErrorsProc,
     PremoveProc, QuietPlayProc, QuitProc, ReloadCmailMsgProc,
     ReloadGameProc, ReloadPositionProc, RematchProc, ResetProc,
     ResignProc, RetractMoveProc, RevertProc, SaveGameProc,
     SavePositionProc, ShowCoordsProc, ShowGameListProc, ShowThinkingProc,
     StopExaminingProc, StopObservingProc, TestLegalityProc, ToEndProc,
     ToStartProc, TrainingProc, TruncateGameProc, and TwoMachinesProc.

3 Options
*********

This section documents the command-line options to XBoard.  You can set
these options in two ways: by typing them on the shell command line you
use to start XBoard, or by setting them as X resources (typically in
your `.Xresources' file).  Many of the options cannot be changed while
XBoard is running; others set the initial state of items that can be
changed with the *note Options:: menu.

   Most of the options have both a long name and a short name. To turn a
boolean option on or off from the command line, either give its long
name followed by the value true or false (`-longOptionName true'), or
give just the short name to turn the option on (`-opt'), or the short
name preceded by `x' to turn the option off (`-xopt'). For options that
take strings or numbers as values, you can use the long or short option
names interchangeably.

   Each option corresponds to an X resource with the same name, so if
you like, you can set options in your `.Xresources' file or in a file
named `XBoard' in your home directory.  For options that have two
names, the longer one is the name of the corresponding X resource; the
short name is not recognized.  To turn a boolean option on or off as an
X resource, give its long name followed by the value true or false
(`XBoard*longOptionName: true').

3.1 Chess Engine Options
========================

-tc or -timeControl minutes[:seconds]
     Each player begins with his clock set to the `timeControl' period.
     Default: 5 minutes.  The additional options `movesPerSession' and
     `timeIncrement' are mutually exclusive.

-mps or -movesPerSession moves
     When both players have made `movesPerSession' moves, a new
     `timeControl' period is added to both clocks.  Default: 40 moves.

-inc or -timeIncrement seconds
     If this option is specified, `movesPerSession' is ignored.
     Instead, after each player's move, `timeIncrement' seconds are
     added to his clock.  Use `-inc 0' if you want to require the entire
     game to be played in one `timeControl' period, with no increment.
     Default: -1, which specifies `movesPerSession' mode.

-clock/-xclock or -clockMode true/false
     Determines whether or not to display the chess clocks. If
     clockMode is false, the clocks are not shown, but the side that is
     to play next is still highlighted. Also, unless `searchTime' is
     set, the chess engine still keeps track of the clock time and uses
     it to determine how fast to make its moves.

-st or -searchTime minutes[:seconds]
     Tells the chess engine to spend at most the given amount of time
     searching for each of its moves. Without this option, the chess
     engine chooses its search time based on the number of moves and
     amount of time remaining until the next time control.  Setting
     this option also sets clockMode to false.

-depth or -searchDepth number
     Tells the chess engine to look ahead at most the given number of
     moves when searching for a move to make. Without this option, the
     chess engine chooses its search depth based on the number of moves
     and amount of time remaining until the next time control.  With
     the option, the engine will cut off its search early if it reaches
     the specified depth.

-firstNPS number
-secondNPS number
     Tells the chess engine to use an internal time standard based on
     its node count, rather then wall-clock time, to make its timing
     decisions.  The time in virtual seconds should be obtained by
     dividing the node count through the given number, like the number
     was a rate in nodes per second.  Xboard will manage the clocks in
     accordance with this, relying on the number of nodes reported by
     the engine in its thinking output. If the given number equals zero,
     it can obviously not be used to convert nodes to seconds, and the
     time reported by the engine is used to decrement the XBoard clock
     in stead. The engine is supposed to report in CPU time it uses,
     rather than wall-clock time, in this mode. This option can provide
     fairer conditions for engine-engine matches on heavily loaded
     machines, or with very fast games (where the wall clock is too
     inaccurate).  `showThinking' must be on for this option to work.
     Default: -1 (off).  Not many engines might support this yet!

-firstTimeOdds factor
-secondTimeOdds factor
     Reduces the time given to the mentioned engine by the given factor.
     If pondering is off, the effect is indistinguishable from what
     would happen if the engine was running on an n-times slower
     machine. Default: 1.

-timeOddsMode mode
     This option determines how the case is handled where both engines
     have a time-odds handicap.  If mode=1, the engine that gets the
     most time will always get the nominal time, as specified by the
     time-control options, and its opponent's time is renormalized
     accordingly.  If mode=0, both play with reduced time. Default: 0.

-hideThinkingFromHuman true/false
     Controls the Hide Thinking option. *Note Options Menu::. Default:
     true.  (Replaces the Show-Thinking option of older xboard
     versions.)

-thinking/-xthinking or -showThinking true/false
     Forces the engine to send thinking output to xboard.  Used to be
     the only way to control if thinking output was displayed in older
     xboard versions, but as the thinking output in xboard 4.3 is also
     used for several other purposes (adjudication, storing in PGN
     file) the display of it is now controlled by the new option Hide
     Thinking. *Note Options Menu::. Default: false.  (But if xboard
     needs the thinking output for some purpose, it makes the engine
     send it despite the setting of this option.)

-ponder/-xponder or -ponderNextMove true/false
     Sets the Ponder Next Move menu option. *Note Options Menu::.
     Default: true.

-smpCores number
     Specifies the maximum number of CPUs an SMP engine is allowed to
     use.  Only works for engines that support the
     XBoard/WinBoard-protocol cores feature.

-mg or -matchGames n
     Automatically runs an n-game match between two chess engines, with
     alternating colors.  If the `loadGameFile' or `loadPositionFile'
     option is set, XBoard starts each game with the given opening
     moves or the given position; otherwise, the games start with the
     standard initial chess position.  If the `saveGameFile' option is
     set, a move record for the match is appended to the specified
     file. If the `savePositionFile' option is set, the final position
     reached in each game of the match is appended to the specified
     file. When the match is over, XBoard displays the match score and
     exits. Default: 0 (do not run a match).

-mm/-xmm or -matchMode true/false
     Setting `matchMode' to true is equivalent to setting `matchGames'
     to 1.

-sameColorGames n
     Automatically runs an n-game match between two chess engines,
     without alternating colors.  Otherwise the same applies as for the
     `-matchGames' option, over which it takes precedence if both are
     specified. (See there.)  Default: 0 (do not run a match).

-fcp or -firstChessProgram program
     Name of first chess engine.  Default: `Fairy-Max'.

-scp or -secondChessProgram program
     Name of second chess engine, if needed.  A second chess engine is
     started only in Two Machines (match) mode.  Default: `Fairy-Max'.

-fb/-xfb or -firstPlaysBlack true/false
     In games between two chess engines, firstChessProgram normally
     plays white.  If this option is true, firstChessProgram plays
     black.  In a multi-game match, this option affects the colors only
     for the first game; they still alternate in subsequent games.

-fh or -firstHost host
-sh or -secondHost host
     Hosts on which the chess engines are to run. The default for each
     is `localhost'. If you specify another host, XBoard uses `rsh' to
     run the chess engine there. (You can substitute a different remote
     shell program for rsh using the `remoteShell' option described
     below.)

-fd or -firstDirectory dir
-sd or -secondDirectory dir
     Working directories in which the chess engines are to be run.  The
     default is "", which means to run the chess engine in the same
     working directory as XBoard itself.  (See the CHESSDIR environment
     variable.)  This option is effective only when the chess engine is
     being run on the local host; it does not work if the engine is run
     remotely using the -fh or -sh option.

-initString string
-secondInitString string
     The string that is sent to initialize each chess engine for a new
     game.  Default:

          new
          random
     Setting this option from the command line is tricky, because you
     must type in real newline characters, including one at the very
     end.  In most shells you can do this by entering a `\' character
     followed by a newline. It is easier to set the option from your
     `.Xresources' file; in that case you can include the character
     sequence `\n' in the string, and it will be converted to a newline.

     If you change this option, don't remove the `new' command; it is
     required by all chess engines to start a new game.

     You can remove the `random' command if you like; including it
     causes GNU Chess 4 to randomize its move selection slightly so
     that it doesn't play the same moves in every game.  Even without
     `random', GNU Chess 4 randomizes its choice of moves from its
     opening book.  Many other chess engines ignore this command
     entirely and always (or never) randomize.

     You can also try adding other commands to the initString; see the
     documentation of the chess engine you are using for details.

-firstComputerString string
-secondComputerString string
     The string that is sent to the chess engine if its opponent is
     another computer chess engine.  The default is `computer\n'.
     Probably the only useful alternative is the empty string (`'),
     which keeps the engine from knowing that it is playing another
     computer.

-reuse/-xreuse or -reuseFirst true/false
-reuse2/-xreuse2 or -reuseSecond true/false
     If the option is false, XBoard kills off the chess engine after
     every game and starts it again for the next game.  If the option
     is true (the default), XBoard starts the chess engine only once
     and uses it repeatedly to play multiple games.  Some old chess
     engines may not work properly when reuse is turned on, but
     otherwise games will start faster if it is left on.

-firstProtocolVersion version-number
-secondProtocolVersion version-number
     This option specifies which version of the chess engine
     communication protocol to use.  By default, version-number is 2.
     In version 1, the "protover" command is not sent to the engine;
     since version 1 is a subset of version 2, nothing else changes.
     Other values for version-number are not supported.

-firstScoreAbs true/false
-secondScoreAbs true/false
     If this option is set, the score reported by the engine is taken
     to be that in favor of white, even when the engine plays black.
     Important when XBoard uses the score for adjudications, or in PGN
     reporting.

-niceEngines priority
     This option allows you to lower the priority of the engine
     processes, so that the generally insatiable hunger for CPU time of
     chess engines does not interfere so much with smooth operation of
     XBoard (or the rest of your system).  Negative values could
     increase the engine priority, which is not recommended.

-firstOptions string
-secondOptions string
     The given string is a comma-separated list of (option name=option
     value) pairs, like the following example: "style=Karpov,blunder
     rate=0".  If an option announced by the engine at startup through
     the feature commands of the XBoard/WinBoard protocol matches one
     of the option names (i.e. "style" or "blunder rate"), it would be
     set to the given value (i.e. "Karpov" or 0) through a
     corresponding option command to the engine.  This provided that
     the type of the value (text or numeric) matches as well.

-firstNeedsNoncompliantFEN string
-secondNeedsNoncompliantFEN string
     The castling rights and e.p. fields of the FEN sent to the
     mentioned engine with the setboard command will be replaced by the
     given string. This can for instance be used to run engines that do
     not understand Chess960 FENs in variant fischerandom, to make them
     at least understand the opening position, through setting the
     string to "KQkq -". (Note you also have to give the e.p. field!)
     Other possible applications are to provide work-arounds for
     engines that want to see castling and e.p. fields in variants that
     do not have castling or e.p.  (shatranj, courier, xiangqi, shogi)
     so that XBoard would normally omit them (string = "- -"), or to
     add variant-specific fields that are not yet supported by XBoard
     (e.g. to indicate the number of checks in 3check).

-shuffleOpenings
     Forces shuffling of the opening setup in variants that normally
     have a fixed initial position.  Shufflings are symmetric for black
     and white, and exempt King and Rooks in variants with normal
     castling.  Remains in force until a new variant is selected.

3.2 UCI + WB Engine Settings
============================

-fUCI or -firstIsUCI true/false
-sUCI or -secondIsUCI true/false
     Indicates if the mentioned engine executable file is an UCI engine,
     and should be run with the aid of the Polyglot adapter rather than
     directly.  Xboard will then pass the other UCI options and engine
     name to Polyglot through a .ini temporary file created for the
     purpose.

-polyglotDir filename
     Gives the name of the directory in which the Polyglot adapter for
     UCI engines resides.  Default: "/usr/local/share/polyglot".

-usePolyglotBook true/false
     Specifies if the Polyglot book should be used.

-polyglotBook filename
     Gives the filename of the opening book that Polyglot should use.
     From XBoard 4.3.15 on, native XBoard/WinBoard engines will also
     use the opening book specified here, provided the
     `usePolyglotBook' option is set to true, and the option
     `firstHasOwnBookUCI' or `secondHasOwnBookUCI' applying to the
     engine is set to false.  The engine will be kept in force mode as
     long as the current position is in book, and XBoard will select
     the book moves for it. Default "".

-fNoOwnBookUCI or -firstXBook or -firstHasOwnBookUCI true/false
-sNoOwnBookUCI or -secondXBook or -secondHasOwnBookUCI true/false
     Indicates if the mentioned engine has its own opening book it
     should play from, rather than using the external book through
     XBoard. Default: false.

-defaultHashSize n
     Sets the size of the hash table to n MegaBytes. Together with the
     EGTB cache size this number is also used to calculate the memory
     setting of XBoard/WinBoard engines, for those that support the
     memory feature of the XBoard/WinBoard protocol. Default: 64.

-defaultCacheSizeEGTB n
     Sets the size of the EGTB cache to n MegaBytes. Together with the
     hash-table size this number is also used to calculate the memory
     setting of XBoard/WinBoard engines, for those that support the
     memory feature of the XBoard/WinBoard protocol. Default: 4.

-defaultPathEGTB filename
     Gives the name of the directory where the end-game tablebases are
     installed, for UCI engines.  Default: "/usr/local/share/egtb".

-egtFormats string
     Specifies which end-game tables are installed on the computer, and
     where.  The argument is a comma-separated list of format
     specifications, each specification consisting of a format name, a
     colon, and a directory path name, e.g.
     "nalimov:/usr/local/share/egtb".  If the name part matches that of
     a format that the engine requests through a feature command,
     xboard will relay the path name for this format to the engine
     through an egtpath command.  One egtpath command for each matching
     format will be sent.  Popular formats are "nalimov" DTM tablebases
     and "scorpio" bitbases.  Default: "".

3.3 ICS options
===============

-ics/-xics or -internetChessServerMode true/false
     Connect with an Internet Chess Server to play chess against its
     other users, observe games they are playing, or review games that
     have recently finished. Default: false.

-icshost or -internetChessServerHost host
     The Internet host name or address of the chess server to connect
     to when in ICS mode. Default: `chessclub.com'.  Another popular
     chess server to try is `freechess.org'.  If your site doesn't have
     a working Internet name server, try specifying the host address in
     numeric form.  You may also need to specify the numeric address
     when using the icshelper option with timestamp or timeseal (see
     below).

-icsport or -internetChessServerPort port-number
     The port number to use when connecting to a chess server in ICS
     mode. Default: 5000.

-icshelper or -internetChessServerHelper prog-name
     An external helper program used to communicate with the chess
     server.  You would set it to "timestamp" for ICC (chessclub.com) or
     "timeseal" for FICS (freechess.org), after obtaining the correct
     version of timestamp or timeseal for your computer.  See "help
     timestamp" on ICC and "help timeseal" on FICS.  This option is
     shorthand for `-useTelnet -telnetProgram program'.

-telnet/-xtelnet or -useTelnet true/false
     This option is poorly named; it should be called useHelper.  If
     set to true, it instructs XBoard to run an external program to
     communicate with the Internet Chess Server.  The program to use is
     given by the telnetProgram option.  If the option is false (the
     default), XBoard opens a TCP socket and uses its own internal
     implementation of the telnet protocol to communicate with the ICS.
     *Note Firewalls::.

-telnetProgram prog-name
     This option is poorly named; it should be called helperProgram.
     It gives the name of the telnet program to be used with the
     `gateway' and `useTelnet' options.  The default is `telnet'. The
     telnet program is invoked with the value of
     `internetChessServerHost' as its first argument and the value of
     `internetChessServerPort' as its second argument.  *Note
     Firewalls::.

-gateway host-name
     If this option is set to a host name, XBoard communicates with the
     Internet Chess Server by using `rsh' to run the `telnetProgram' on
     the given host, instead of using its own internal implementation
     of the telnet protocol. You can substitute a different remote shell
     program for `rsh' using the `remoteShell' option described below.
     *Note Firewalls::.

-internetChessServerCommPort or -icscomm dev-name
     If this option is set, XBoard communicates with the ICS through
     the given character I/O device instead of opening a TCP connection.
     Use this option if your system does not have any kind of Internet
     connection itself (not even a SLIP or PPP connection), but you do
     have dial-up access (or a hardwired terminal line) to an Internet
     service provider from which you can telnet to the ICS.

     The support for this option in XBoard is minimal. You need to set
     all communication parameters and tty modes before you enter XBoard.

     Use a script something like this:

          stty raw -echo 9600 > /dev/tty00
          xboard -ics -icscomm /dev/tty00

     Here replace `/dev/tty00' with the name of the device that your
     modem is connected to. You might have to add several more options
     to these stty commands. See the man pages for `stty' and `tty' if
     you run into problems. Also, on many systems stty works on its
     standard input instead of standard output, so you have to use `<'
     instead of `>'.

     If you are using linux, try starting with the script below.
     Change it as necessary for your installation.

          #!/bin/sh -f
          # configure modem and fire up XBoard

          # configure modem
          (
            stty 2400 ; stty raw ; stty hupcl ; stty -clocal
            stty ignbrk ; stty ignpar ; stty ixon ; stty ixoff
            stty -iexten ; stty -echo
          ) < /dev/modem
          xboard -ics -icscomm /dev/modem
     After you start XBoard in this way, type whatever commands are
     necessary to dial out to your Internet provider and log in.  Then
     telnet to ICS, using a command like `telnet chessclub.com 5000'.
     Important: See the paragraph below about extra echoes, in *note
     Limitations::.

-icslogon or -internetChessServerLogonScript file-name
     Whenever XBoard connects to the Internet Chess Server, if it finds
     a file with the name given in this option, it feeds the file's
     contents to the ICS as commands. The default file name is `.icsrc'.
     Usually the first two lines of the file should be your ICS user
     name and password.  The file can be either in $CHESSDIR, in
     XBoard's working directory if CHESSDIR is not set, or in your home
     directory.

-msLoginDelay delay
     If you experience trouble logging on to an ICS when using the
     `-icslogon' option, inserting some delay between characters of the
     logon script may help. This option adds `delay' milliseconds of
     delay between characters. Good values to try are 100 and 250.

-icsinput/-xicsinput or -internetChessServerInputBox true/false
     Sets the ICS Input Box menu option. *Note Mode Menu::. Default:
     false.

-autocomm/-xautocomm or -autoComment true/false
     Sets the Auto Comment menu option. *Note Options Menu::. Default:
     false.

-autoflag/-xautoflag or -autoCallFlag true/false
     Sets the Auto Flag menu option.  *Note Options Menu::. Default:
     false.

-autobs/-xautobs or -autoObserve true/false
     Sets the Auto Observe menu option.  *Note Options Menu::. Default:
     false.

-autoKibitz
     Enables kibitzing of the engines last thinking output (depth,
     score, time, speed, PV) before it moved to the ICS, in zippy mode.
     The option `showThinking' must be switched on for this option to
     work.  Also diverts similar kibitz information of an opponent
     engine that is playing you through the ICS to the engine-output
     window, as if the engine was playing locally.

-seekGraph true/false or -sg
     Enables displaying of the seek graph by left-clicking the board
     when you are logged on to an ICS and currently idle.  The seek
     graph show all players currently seeking games on the ICS, plotted
     according to their rating and the time control of the game they
     seek, in three different colors (for rated, unrated and wild
     games).  Computer ads are displayed as squares, human ads are dots.
     Default: false.

-autoRefresh true/false
     Enables automatic updating of the seek graph, by having the ICS
     send a running update of all newly placed and removed seek ads.
     This consumes a substantial amount of communication bandwidth, and
     is only supported for FICS and ICC.  Default: false.

-backgroundObserve true/false
     When true, boards sent to you by the ICS from other games while
     you are playing (e.g. because you are observing them) will not be
     automatically displayed.  Only a summary of time left and material
     of both players will appear in the message field above the board.
     XBoard will remember the last board it has received this way, and
     will display it in stead of the position in your own game when you
     press the right mouse button.  No other information is stored on
     such games observed in the background; you cannot save such a game
     later, or step through its moves.  This feature is provided solely
     for the benefit of bughouse players, to enable them to peek at
     their partner's game without the need to logon twice.  Default:
     false.

-dualBoard true/false
     In combination with -backgroundObserve true, this option will
     display the board of the background game side by side with that of
     your own game, so you can have it in view permanently.  Any board
     or holdings info coming in will be displayed on the secondary
     board immediately.  This feature is still experimental and largely
     unfinished.  There is no animation or highlighting of moves on the
     secondary board.  Default: false.

-oneClickMove true/false
     When set, this option allows you to enter moves by only clicking
     the to- or from-square, when only a single legal move to or from
     that square is possible.  Double-clicking a piece (or clicking an
     already selected piece) will instruct that piece to make the only
     capture it can legally do.  Default: false.

-moves/-xmoves or -getMoveList true/false
     Sets the Get Move List menu option.  *Note Options Menu::.
     Default: true.

-alarm/-xalarm or -icsAlarm true/false
     Sets the ICS Alarm menu option.  *Note Options Menu::. Default:
     true.

-icsAlarmTime ms
     Sets the time in milliseconds for the ICS Alarm menu option.
     *Note Options Menu::. Default: 5000.

lowTimeWarning true/false
     Controls a color change of the board as a warning your time is
     running out.  *Note Options Menu::. Default: false.

-pre/-xpre \fRor\fB -premove true/false
     Sets the Premove menu option. *Note Options Menu::. Default: true.

-quiet/-xquiet or -quietPlay true/false
     Sets the Quiet Play menu option.  *Note Options Menu::.  Default:
     false.

-colorizeMessages or -colorize
     Setting colorizeMessages to true tells XBoard to colorize the
     messages received from the ICS.  Colorization works only if your
     xterm supports ISO 6429 escape sequences for changing text colors.

-colorShout foreground,background,bold
-colorSShout foreground,background,bold
-colorChannel1 foreground,background,bold
-colorChannel foreground,background,bold
-colorKibitz foreground,background,bold
-colorTell foreground,background,bold
-colorChallege foreground,background,bold
-colorRequest foreground,background,bold
-colorSeek foreground,background,bold
-colorNormal foreground,background,bold
     These options set the colors used when colorizing ICS messages.
     All ICS messages are grouped into one of these categories: shout,
     sshout, channel 1, other channel, kibitz, tell, challenge, request
     (including abort, adjourn, draw, pause, and takeback), or normal
     (all other messages).

     Each foreground or background argument can be one of the following:
     black, red, green, yellow, blue, magenta, cyan, white, or default.
     Here "default" means the default foreground or background color of
     your xterm.  Bold can be 1 or 0.  If background is omitted,
     "default" is assumed; if bold is omitted, 0 is assumed.

     Here is an example of how to set the colors in your `.Xresources'
     file.  The colors shown here are the default values; you will get
     them if you turn `-colorize' on without specifying your own colors.

          xboard*colorizeMessages: true
          xboard*colorShout: green
          xboard*colorSShout: green, black, 1
          xboard*colorChannel1: cyan
          xboard*colorChannel: cyan, black, 1
          xboard*colorKibitz: magenta, black, 1
          xboard*colorTell: yellow, black, 1
          xboard*colorChallenge: red, black, 1
          xboard*colorRequest: red
          xboard*colorSeek: blue
          xboard*colorNormal: default

-soundProgram progname
     If this option is set to a sound-playing program that is installed
     and working on your system, XBoard can play sound files when
     certain events occur, listed below.  The default program name is
     "play".  If any of the sound options is set to "$", the event
     rings the terminal bell by sending a ^G character to standard
     output, instead of playing a sound file.  If an option is set to
     the empty string "", no sound is played for that event.

-soundShout filename
-soundSShout filename
-soundChannel filename
-soundKibitz filename
-soundTell filename
-soundChallenge filename
-soundRequest filename
-soundSeek filename
     These sounds are triggered in the same way as the colorization
     events described above.  They all default to "", no sound.  They
     are played only if the colorizeMessages is on.

-soundMove filename
     This sound is used by the Move Sound menu option.  Default: "$".

-soundIcsAlarm filename
     This sound is used by the ICS Alarm menu option.  Default: "$".

-soundIcsWin filename
     This sound is played when you win an ICS game.  Default: "" (no
     sound).

-soundIcsLoss filename
     This sound is played when you lose an ICS game.  Default: "" (no
     sound).

-soundIcsDraw filename
     This sound is played when you draw an ICS game.  Default: "" (no
     sound).

-soundIcsUnfinished filename
     This sound is played when an ICS game that you are participating
     in is aborted, adjourned, or otherwise ends inconclusively.
     Default: "" (no sound).

     Here is an example of how to set the sounds in your `.Xresources'
     file:

          xboard*soundShout: shout.wav
          xboard*soundSShout: sshout.wav
          xboard*soundChannel1: channel1.wav
          xboard*soundChannel: channel.wav
          xboard*soundKibitz: kibitz.wav
          xboard*soundTell: tell.wav
          xboard*soundChallenge: challenge.wav
          xboard*soundRequest: request.wav
          xboard*soundSeek: seek.wav
          xboard*soundMove: move.wav
          xboard*soundIcsWin: win.wav
          xboard*soundIcsLoss: lose.wav
          xboard*soundIcsDraw: draw.wav
          xboard*soundIcsUnfinished: unfinished.wav
          xboard*soundIcsAlarm: alarm.wav

-dropMenu true|false
     This option allows you to emulate old behavior, where the right
     mouse button brings up the (now deprecated) drop menu rather than
     displaying the position at the end of the principal variation.
     Default: False.

-variations true|false
     When this option is on, you can start new variations in Edit Game
     or Analyze mode by holding the Shift key down while entering a
     move.  When it is off, the Shift key will be ignored.  Default:
     False.

3.4 Load and Save options
=========================

-lgf or -loadGameFile file
-lgi or -loadGameIndex index
     If the `loadGameFile' option is set, XBoard loads the specified
     game file at startup. The file name `-' specifies the standard
     input. If there is more than one game in the file, XBoard pops up
     a menu of the available games, with entries based on their PGN
     (Portable Game Notation) tags.  If the `loadGameIndex' option is
     set to `N', the menu is suppressed and the N th game found in the
     file is loaded immediately.  The menu is also suppressed if
     `matchMode' is enabled or if the game file is a pipe; in these
     cases the first game in the file is loaded immediately.  Use the
     `pxboard' shell script provided with XBoard if you want to pipe in
     files containing multiple games and still see the menu.  If the
     loadGameIndex specifies an index -1, this triggers auto-increment
     of the index in `matchMode', which means that after every game the
     index is incremented by one, causing each game of the match to be
     played from the next game in the file. Similarly, specifying an
     index value of -2 causes the index to be incremented every two
     games, so that each game in the file is used twice (with reversed
     colors).  The `rewindIndex' option causes the index to be reset to
     the first game of the file when it has reached a specified value.

-rewindIndex n
     Causes a position file or game file to be rewound to its beginning
     after n positions or games in auto-increment `matchMode'.  See
     `loadPositionIndex' and `loadGameIndex'.  default: 0 (no rewind).

-td or -timeDelay seconds
     Time delay between moves during `Load Game' or `Analyze File'.
     Fractional seconds are allowed; try `-td 0.4'.  A time delay value
     of -1 tells XBoard not to step through game files automatically.
     Default: 1 second.

-sgf or -saveGameFile file
     If this option is set, XBoard appends a record of every game
     played to the specified file. The file name `-' specifies the
     standard output.

-autosave/-xautosave or -autoSaveGames true/false
     Sets the Auto Save menu option.  *Note Options Menu::.  Default:
     false.  Ignored if `saveGameFile' is set.

-lpf or -loadPositionFile file
-lpi or -loadPositionIndex index
     If the `loadPositionFile' option is set, XBoard loads the
     specified position file at startup. The file name `-' specifies the
     standard input. If the `loadPositionIndex' option is set to N, the
     Nth position found in the file is loaded; otherwise the first
     position is loaded.  If the loadPositionIndex specifies an index
     -1, this triggers auto-increment of the index in `matchMode',
     which means that after every game the index is incremented by one,
     causing each game of the match to be played from the next position
     in the file. Similarly, specifying an index value of -2 causes the
     index to be incremented every two games, so that each position in
     the file is used twice (with the engines playing opposite colors).
     The `rewindIndex' option causes the index to be reset to the first
     position of the file when it has reached a specified value.

-spf or -savePositionFile file
     If this option is set, XBoard appends the final position reached
     in every game played to the specified file. The file name `-'
     specifies the standard output.

-pgnExtendedInfo true/false
     If this option is set, XBoard saves depth, score and time used for
     each move that the engine found as a comment in the PGN file.
     Default: false.

-pgnEventHeader string
     Sets the name used in the PGN event tag to string.  Default:
     "Computer Chess Game".

-saveOutOfBookInfo true/false
     Include the information on how the engine(s) game out of its
     opening book in a special 'annotator' tag with the PGN file.

-oldsave/-xoldsave or -oldSaveStyle true/false
     Sets the Old Save Style menu option.  *Note Options Menu::.
     Default: false.

-gameListTags string
     The character string lists the PGN tags that should be printed in
     the Game List, and their order. The meaning of the codes is
     e=event, s=site, d=date, o=round, p=players, r=result, w=white
     Elo, b=black Elo, t=time control, v=variant, a=out-of-book info,
     c=result comment.  Default: "eprd"

-ini or -settingsFile filename
-saveSettingsFile filename
@filename
     When XBoard encounters an option -settingsFile (or -ini for short),
     or @filename, it tries to read the mentioned file, and substitutes
     the contents of it (presumaby more command-line options) in place
     of the option.  In the case of -ini or -settingsFile, the name of
     a successfully read settings file is also remembered as the file
     to use for saving settings (automatically on exit, or on user
     command).  An option of the form @filename does not affect saving.
     The option -saveSettingsFile does specify a name of the file to use
     for saving, without reading any options from it, and is thus also
     effective when the file did not exist yet.  So the settings will
     be saved to the file specified in the last -saveSettingsFile or
     succesfull -settingsFile / -ini command, if any, and in
     /etc/xboard/xboard.conf otherwise.  Usualy the latter is only
     accessible for the system administrator, though, and will be used
     to contain system-wide default setings, amongst which a
     -saveSettingsFile and -settingsFile options to specify a settings
     file accessible to the individual user, such as ~/.xboardrc in the
     user's home directory.

3.5 User interface options
==========================

-display
-geometry
-iconic
     These and most other standard Xt options are accepted.

-noGUI
     Suppresses all GUI functions of XBoard (to speed up automated
     ultra-fast engine-engine games, which you don’t want to watch).
     There will be no board or clock updates, no printing of moves, and
     no update of the icon on the task bar in this mode.

-movesound/-xmovesound or -ringBellAfterMoves true/false
     Sets the Move Sound menu option.  *Note Options Menu::.  Default:
     false.  For compatibility with old XBoard versions, -bell/-xbell
     are also accepted as abbreviations for this option.

-exit/-xexit or -popupExitMessage true/false
     Sets the Popup Exit Message menu option.  *Note Options Menu::.
     Default: true.

-popup/-xpopup or -popupMoveErrors true/false
     Sets the Popup Move Errors menu option.  *Note Options Menu::.
     Default: false.

-queen/-xqueen or -alwaysPromoteToQueen true/false
     Sets the Always Queen menu option.  *Note Options Menu::.
     Default: false.

-legal/-xlegal or -testLegality true/false
     Sets the Test Legality menu option.  *Note Options Menu::.
     Default: true.

-size or -boardSize (sizeName | n1,n2,n3,n4,n5,n6,n7)
     Determines how large the board will be, by selecting the pixel size
     of the pieces and setting a few related parameters.  The sizeName
     can be one of: Titanic, giving 129x129 pixel pieces, Colossal
     116x116, Giant 108x108, Huge 95x95, Big 87x87, Large 80x80, Bulky
     72x72, Medium 64x64, Moderate 58x58, Average 54x54, Middling
     49x49, Mediocre 45x45, Small 40x40, Slim 37x37, Petite 33x33,
     Dinky 29x29, Teeny 25x25, or Tiny 21x21.  Orthodox pieces of all
     these sizes are built into XBoard.  Other sizes can be used if you
     have them; see the pixmapDirectory and bitmapDirectory options.
     Complete sets of un-orthodox pieces are only provided in sizes
     Bulky, Middling and (to a lesser extent) Petite; Archbishop,
     Marshall and Amazon are also available in all sizes between Bulky
     and Petite.  When no bitmap is available, the piece will be
     displayed as Amazon or King.  The default depends on the size of
     your screen; it is approximately the largest size that will fit
     without clipping.

     You can select other sizes or vary other layout parameters by
     providing a list of comma-separated values (with no spaces) as the
     argument.  You do not need to provide all the values; for any you
     omit from the end of the list, defaults are taken from the nearest
     built-in size.  The value `n1' gives the piece size, `n2' the
     width of the black border between squares, `n3' the desired size
     for the clockFont, `n4' the desired size for the coordFont, `n5'
     the desired size for the default font, `n6' the smallLayout flag
     (0 or 1), and `n7' the tinyLayout flag (0 or 1).  All dimensions
     are in pixels.  If the border between squares is eliminated (0
     width), the various highlight options will not work, as there is
     nowhere to draw the highlight.  If smallLayout is 1 and
     `titleInWindow' is true, the window layout is rearranged to make
     more room for the title.  If tinyLayout is 1, the labels on the
     menu bar are abbreviated to one character each and the buttons in
     the button bar are made narrower.

-coords/-xcoords or -showCoords true/false
     Sets the Show Coords menu option.  *Note Options Menu::.  Default:
     false.  The `coordFont' option specifies what font to use.

-autoraise/-xautoraise or -autoRaiseBoard true/false
     Sets the Auto Raise Board menu option.  *Note Options Menu::.
     Default: true.

-autoflip/-xautoflip or -autoFlipView true/false
     Sets the Auto Flip View menu option.  *Note Options Menu::.
     Default: true.

-flip/-xflip or -flipView true/false
     If Auto Flip View is not set, or if you are observing but not
     participating in a game, then the positioning of the board at the
     start of each game depends on the flipView option.  If flipView is
     false (the default), the board is positioned so that the white
     pawns move from the bottom to the top; if true, the black pawns
     move from the bottom to the top.  In any case, the Flip menu
     option (see *note Options Menu::) can be used to flip the board
     after the game starts.

-title/-xtitle or -titleInWindow true/false
     If this option is true, XBoard displays player names (for ICS
     games) and game file names (for `Load Game') inside its main
     window. If the option is false (the default), this information is
     displayed only in the window banner. You probably won't want to
     set this option unless the information is not showing up in the
     banner, as happens with a few X window managers.

-buttons/-xbuttons or -showButtonBar True/False
     If this option is False, xboard omits the [<<] [<] [P] [>] [>>]
     button bar from the window, allowing the message line to be wider.
     You can still get the functions of these buttons using the menus
     or their keyboard shortcuts.  Default: true.

-mono/-xmono or -monoMode true/false
     Determines whether XBoard displays its pieces and squares with two
     colors (true) or four (false). You shouldn't have to specify
     `monoMode'; XBoard will determine if it is necessary.

-showTargetSquares true/false
     Determines whether XBoard can highlight the squares a piece has
     legal moves to, when you grab that piece with the mouse.  If this
     option is set, this feature can be controlled through the
     Highlight Dragging menu item.

-flashCount count
-flashRate rate
-flash/-xflash
     These options enable flashing of pieces when they land on their
     destination square.  `flashCount' tells XBoard how many times to
     flash a piece after it lands on its destination square.
     `flashRate' controls the rate of flashing (flashes/sec).
     Abbreviations: `flash' sets flashCount to 3.  `xflash' sets
     flashCount to 0.  Defaults:  flashCount=0 (no flashing),
     flashRate=5.

-highlight/-xhighlight or -highlightLastMove true/false
     Sets the Highlight Last Move menu option. *Note Options Menu::.
     Default: false.

-highlightMoveWithArrow true/false
     Sets the Highlight with Arrow menu option. *Note Options Menu::.
     Default: false.

-blind/-xblind or -blindfold true/false
     Sets the Blindfold menu option.  *Note Options Menu::.  Default:
     false.

-clockFont font
     The font used for the clocks. If the option value is a pattern
     that does not specify the font size, XBoard tries to choose an
     appropriate font for the board size being used.  Default:
     -*-helvetica-bold-r-normal-*-*-*-*-*-*-*-*.

-coordFont font
     The font used for rank and file coordinate labels if `showCoords'
     is true. If the option value is a pattern that does not specify
     the font size, XBoard tries to choose an appropriate font for the
     board size being used.  Default:
     -*-helvetica-bold-r-normal-*-*-*-*-*-*-*-*.

-font font
     The font used for popup dialogs, menus, comments, etc.  If the
     option value is a pattern that does not specify the font size,
     XBoard tries to choose an appropriate font for the board size
     being used.  Default: -*-helvetica-medium-r-normal-*-*-*-*-*-*-*-*.

-fontSizeTolerance tol
     In the font selection algorithm, a nonscalable font will be
     preferred over a scalable font if the nonscalable font's size
     differs by `tol' pixels or less from the desired size.  A value of
     -1 will force a scalable font to always be used if available; a
     value of 0 will use a nonscalable font only if it is exactly the
     right size; a large value (say 1000) will force a nonscalable font
     to always be used if available.  Default: 4.

-bm or -bitmapDirectory dir
-pixmap or -pixmapDirectory dir
     These options control what piece images xboard uses.  The XBoard
     distribution includes one set of pixmap pieces in xpm format, in
     the directory `pixmaps', and one set of bitmap pieces in xbm
     format, in the directory `bitmaps'.  Pixmap pieces give a better
     appearance on the screen: the white pieces have dark borders, and
     the black pieces have opaque internal details.  With bitmaps,
     neither piece color has a border, and the internal details are
     transparent; you see the square color or other background color
     through them.

     If XBoard is configured and compiled on a system that includes
     libXpm, the X pixmap library, the xpm pixmap pieces are compiled
     in as the default.  A different xpm piece set can be selected at
     runtime with the `pixmapDirectory' option, or a bitmap piece set
     can be selected with the `bitmapDirectory' option.

     If XBoard is configured and compiled on a system that does not
     include libXpm (or the `--disable-xpm' option is given to the
     configure program), the bitmap pieces are compiled in as the
     default.  It is not possible to use xpm pieces in this case, but
     pixmap pieces in another format called "xim" can be used by giving
     the `pixmapDirectory' option.  Or again, a different bitmap piece
     set can be selected with the `bitmapDirectory' option.

     Files in the `bitmapDirectory' must be named as follows: The first
     character of a piece bitmap name gives the piece it represents
     (`p', `n', `b', `r', `q', or `k'), the next characters give the
     size in pixels, the following character indicates whether the
     piece is solid or outline (`s' or `o'), and the extension is `.bm'.
     For example, a solid 80x80 knight would be named `n80s.bm'.  The
     outline bitmaps are used only in monochrome mode.  If bitmap
     pieces are compiled in and the bitmapDirectory is missing some
     files, the compiled in pieces are used instead.

     If the bitmapDirectory option is given, it is also possible to
     replace xboard's icons and menu checkmark, by supplying files
     named `icon_white.bm', `icon_black.bm', and `checkmark.bm'.

     For more information about pixmap pieces and how to get additional
     sets, see *note zic2xpm:: below.

-whitePieceColor color
-blackPieceColor color
-lightSquareColor color
-darkSquareColor color
-highlightSquareColor color
-lowTimeWarningColor color
     Colors to use for the pieces, squares, and square highlights.
     Defaults:

          -whitePieceColor       #FFFFCC
          -blackPieceColor       #202020
          -lightSquareColor      #C8C365
          -darkSquareColor       #77A26D
          -highlightSquareColor  #FFFF00
          -premoveHighlightColor #FF0000
          -lowTimeWarningColor   #FF0000

     On a grayscale monitor you might prefer:

          -whitePieceColor       gray100
          -blackPieceColor       gray0
          -lightSquareColor      gray80
          -darkSquareColor       gray60
          -highlightSquareColor  gray100
          -premoveHighlightColor gray70
          -lowTimeWarningColor   gray70

-drag/-xdrag or -animateDragging true/false
     Sets the Animate Dragging menu option. *Note Options Menu::.
     Default: true.

-animate/-xanimate or -animateMoving true/false
     Sets the Animate Moving menu option. *Note Options Menu::.
     Default: true.

-animateSpeed n
     Number of milliseconds delay between each animation frame when
     Animate Moves is on.

-autoDisplayComment true/false
-autoDisplayTags true/false
     If set to true, these options cause the window with the move
     comments, and the window with PGN tags, respectively, to pop up
     automatically when such tags or comments are encountered during
     the replaying a stored or loaded game.  Default: true.

-pasteSelection true/false
     If this option is set to true, the Paste Position and Paste Game
     options paste from the currently selected text.  If false, they
     paste from the clipboard.  Default: false.

3.6 Adjudication Options
========================

-adjudicateLossThreshold n
     If the given value is non-zero, XBoard adjudicates the game as a
     loss if both engines agree for a duration of 6 consecutive ply
     that the score is below the given score threshold for that engine.
     Make sure the score is interpreted properly by XBoard, using
     `-firstScoreAbs' and `-secondScoreAbs' if needed.  Default: 0 (no
     adjudication)

-adjudicateDrawMoves n
     If the given value is non-zero, XBoard adjudicates the game as a
     draw if after the given number of moves it was not yet decided.
     Default: 0 (no adjudication)

-checkMates true/false
     If this option is set, XBoard detects all checkmates and
     stalemates, and ends the game as soon as they occur.
     Legality-testing must be switched on for this option to work.
     Default: true

-testClaims true/false
     If this option is set, XBoard verifies all result claims made by
     engines, and those who send false claims will forfeit the game
     because of it.  Legality-testing must be switched on for this
     option to work. Default: true

-materialDraws true/false
     If this option is set, XBoard adjudicates games as draws when
     there is no sufficient material left to inflict a checkmate.  This
     applies to KBKB with like bishops (any number, actually), and to
     KBK, KNK and KK.  Legality-testing must be switched on for this
     option to work. Default: true

-trivialDraws true/false
     If this option is set, XBoard adjudicates games as draws that
     cannot be usually won without opponent cooperation. This applies
     to KBKB with unlike bishops, and to KBKN, KNKN, KNNK, KRKR and
     KQKQ. The draw is called after 6 ply into these end-games, to
     allow quick mates that can occur in some exceptional positions to
     be found by the engines.  KQKQ does not really belong in this
     category, and might be taken out in the future.  (When
     bitbase-based adjudications are implemented.)  Legality-testing
     must be on for this option to work. Default: false

-ruleMoves n
     If the given value is non-zero, XBoard adjudicates the game as a
     draw after the given number of consecutive reversible moves.
     Engine draw claims are always accepted after 50 moves,
     irrespective of the given value of n.

-repeatsToDraw n
     If the given value is non-zero, xboard adjudicates the game as a
     draw if a position is repeated the given number of times. Engines
     draw claims are always accepted after 3 repeats, (on the 3rd
     occurrence, actually), irrespective of the value of n.  Beware
     that positions that have different castling or en-passant rights
     do not count as repeats, XBoard is fully e.p. and castling aware!

3.7 Other options
=================

-ncp/-xncp or -noChessProgram true/false
     If this option is true, XBoard acts as a passive chessboard; it
     does not start a chess engine at all. Turning on this option also
     turns off clockMode. Default: false.

-mode or -initialMode modename
     If this option is given, XBoard selects the given modename from
     the Mode menu after starting and (if applicable) processing the
     loadGameFile or loadPositionFile option. Default: "" (no
     selection).  Other supported values are MachineWhite,
     MachineBlack, TwoMachines, Analysis, AnalyzeFile, EditGame,
     EditPosition, and Training.

-variant varname
     Activates preliminary, partial support for playing chess variants
     against a local engine or editing variant games.  This flag is not
     needed in ICS mode.  Recognized variant names are:

          normal        Normal chess
          wildcastle    Shuffle chess, king can castle from d file
          nocastle      Shuffle chess, no castling allowed
          fischerandom  Fischer Random shuffle chess
          bughouse      Bughouse, ICC/FICS rules
          crazyhouse    Crazyhouse, ICC/FICS rules
          losers        Lose all pieces or get mated (ICC wild 17)
          suicide       Lose all pieces including king (FICS)
          giveaway      Try to have no legal moves (ICC wild 26)
          twokings      Weird ICC wild 9
          kriegspiel    Opponent's pieces are invisible
          atomic        Capturing piece explodes (ICC wild 27)
          3check        Win by giving check 3 times (ICC wild 25)
          shatranj      An ancient precursor of chess (ICC wild 28)
          xiangqi       Chinese Chess (on a 9x10 board)
          shogi         Japanese Chess (on a 9x9 board & piece drops)
          capablanca    Capablanca Chess (10x8 board, with Archbishop
                        and Chancellor pieces)
          gothic        similar, with a better initial position
          caparandom    An FRC-like version of Capablanca Chess (10x8)
          janus         A game with two Archbishops (10x8 board)
          courier       Medieval intermediate between shatranj and
                        modern Chess (on 12x8 board)
          falcon        Patented 10x8 variant with two Falcon pieces
          berolina      Pawns capture straight ahead, and move diagonal
          cylinder      Pieces wrap around the board edge
          knightmate    King moves as Knight, and vice versa
          super         Superchess (shuffle variant with 4 exo-pieces)
          makruk        Thai Chess (shatranj-like, P promotes on 6th rank)
          spartan       Spartan Chess (black has unorthodox pieces)
          fairy         A catchall variant in which all piece types
                        known to XBoard can participate (8x8)
          unknown       Catchall for other unknown variants

     NOT ALL BOARDSIZES PROVIDE A COMPLETE SET OF BUILT-IN BITMAPS FOR
     ALL UN-ORTHODOX PIECES, though. Only in `boardSize' middling and
     bulky all 22 piece types are provided, while -boardSize petite has
     most of them. Archbishop, Chancellor and Amazon are supported in
     every size from petite to bulky. Kings or Amazons are substituted
     for missing bitmaps. You can still play variants needing
     un-orthodox pieces in other board sizes providing your own bitmaps
     through the `bitmapDirectory' or `pixmapDirectory' options.

     In the shuffle variants, XBoard now does shuffle the pieces,
     although you can still do it by hand using Edit Position.  Some
     variants are supported only in ICS mode, including bughouse, and
     kriegspiel.  The winning/drawing conditions in crazyhouse
     (off-board interposition on mate) are not fully understood, but
     losers, suicide, giveaway, atomic, and 3check should be OK.
     Berolina and cylinder chess can only be played with legality
     testing off.  In crazyhouse, XBoard now does keep track of
     off-board pieces.  In shatranj it does implement the baring rule
     when mate detection is switched on.

-boardHeight N
     Allows you to set a non-standard number of board ranks in any
     variant.  If the height is given as -1, the default height for the
     variant is used.  Default: -1

-boardWidth N
     Allows you to set a non-standard number of board files in any
     variant.  If the width is given as -1, the default width for the
     variant is used.  With a non-standard width, the initial position
     will always be an empty board, as the usual opening array will not
     fit.  Default: -1

-holdingsSize N
     Allows you to set a non-standard size for the holdings in any
     variant.  If the size is given as -1, the default holdings size
     for the variant is used.  The first N piece types will go into the
     holdings on capture, and you will be able to drop them on the
     board in stead of making a normal move. If size equals 0, there
     will be no holdings.  Default: -1

-defaultFrcPosition N
     Specifies the number of the opening position in shuffle games like
     Chess960.  A value of -1 means the position is randomly generated
     by XBoard at the beginning of every game.  Default: -1

-pieceToSquareTable string
     The characters that are used to represent the piece types XBoard
     knows in FEN diagrams and SAN moves. The string argument has to
     have an even length (or it will be ignored), as white and black
     pieces have to be given separately (in that order). The last
     letter for each color will be the King.  The letters before that
     will be PNBRQ and then a whole host of fairy pieces in an order
     that has not fully crystallized yet (currently FEACWMOHIJGDVSLU,
     F=Ferz, Elephant, A=Archbishop, C=Chancellor, W=Wazir, M=Commoner,
     O=Cannon, H=Nightrider). You should list at least all pieces that
     occur in the variant you are playing. If you have less than 44
     characters in the string, the pieces not mentioned will get
     assigned a period, and you will not be able to distinguish them in
     FENs. You can also explicitly assign pieces a period, in which
     case they will not be counted in deciding which captured pieces
     can go into the holdings.  A tilde '~' as a piece name does mean
     this piece is used to represent a promoted Pawn in crazyhouse-like
     games, i.e. on capture it turns back onto a Pawn.  A '+' similarly
     indicates the piece is a shogi-style promoted piece, that should
     revert to its non-promoted version on capture (rather than to a
     Pawn).  Note that promoted pieces are represented by pieces 11
     further in the list.  You should not have to use this option
     often: each variant has its own default setting for the piece
     representation in FEN, which should be sufficient in normal use.
     Default: ""

-debug/-xdebug or -debugMode true/false
     Turns on debugging printout.

-debugFile filename or -nameOfDebugFile filename
     Sets the name of the file to which XBoard saves debug information
     (including all communication to and from the engines).

-engineDebugOutput number
     Specifies how XBoard should handle unsolicited output from the
     engine, with respect to saving it in the debug file.  The output
     is further (hopefully) ignored.  If number=0, XBoard refrains from
     writing such spurious output to the debug file.  If number=1, all
     engine output is written faithfully to the debug file.  If
     number=2, any protocol-violating line is prefixed with a '#'
     character, as the engine itself should have done if it wanted to
     submit info for inclusion in the debug file.  This option is
     provided for the benefit of applications that use the debug file
     as a source of information, such as the broadcaster of live games
     TLCV / TLCS.  Such applications can be protected from spurious
     engine output that might otherwise confuse them.

-rsh or -remoteShell shell-name
     Name of the command used to run programs remotely. The default is
     `rsh' or `remsh', determined when XBoard is configured and
     compiled.

-ruser or -remoteUser user-name
     User name on the remote system when running programs with the
     `remoteShell'. The default is your local user name.

-userName username
     Name under which the Human player will be listed in the PGN file.
     Default is the login name on your local computer.

-delayBeforeQuit number
-delayAfterQuit number
     These options specify how long XBoard has to wait before sending a
     termination signal to rogue engine processes, that do not want to
     react to the 'quit' command. The second one determines the pause
     after killing the engine, to make sure it dies.


4 Chess Servers
***************

An "Internet Chess Server", or "ICS", is a place on the Internet where
people can get together to play chess, watch other people's games, or
just chat.  You can use either `telnet' or a client program like XBoard
to connect to the server.  There are thousands of registered users on
the different ICS hosts, and it is not unusual to meet 200 on both
chessclub.com and freechess.org.

   Most people can just type `xboard -ics' to start XBoard as an ICS
client.  Invoking XBoard in this way connects you to the Internet Chess
Club (ICC), a commercial ICS.  You can log in there as a guest even if
you do not have a paid account.  To connect to the largest Free ICS
(FICS), use the command `xboard -ics -icshost freechess.org' instead,
or substitute a different host name to connect to your favorite ICS.
For a full description of command-line options that control the
connection to ICS and change the default values of ICS options, see
*note ICS options::.

   While you are running XBoard as an ICS client, you use the terminal
window that you started XBoard from as a place to type in commands and
read information that is not available on the chessboard.

   The first time you need to use the terminal is to enter your login
name and password, if you are a registered player. (You don't need to do
this manually; the `icsLogon' option can do it for you.  *note ICS
options::.)  If you are not registered, enter `g' as your name, and the
server will pick a unique guest name for you.

   Some useful ICS commands include
`help <topic>'
     to get help on the given <topic>. To get a list of possible topics
     type "help" without topic.  Try the help command before you ask
     other people on the server for help.

     For example `help register' tells you how to become a registered
     ICS player.

`who <flags>'
     to see a list of people who are logged on.  Administrators (people
     you should talk to if you have a problem) are marked with the
     character `*', an asterisk. The <flags> allow you to display only
     selected players: For example, `who of' shows a list of players
     who are interested in playing but do not have an opponent.

`games'
     to see what games are being played

`match <player> [<mins>] [<inc>]'
     to challenge another player to a game. Both opponents get <mins>
     minutes for the game, and <inc> seconds will be added after each
     move.  If another player challenges you, the server asks if you
     want to accept the challenge; use the `accept' or `decline'
     commands to answer.

`accept'
`decline'
     to accept or decline another player's offer.  The offer may be to
     start a new game, or to agree to a `draw', `adjourn' or `abort'
     the current game. *Note Action Menu::.

     If you have more than one pending offer (for example, if more than
     one player is challenging you, or if your opponent offers both a
     draw and to adjourn the game), you have to supply additional
     information, by typing something like `accept <player>', `accept
     draw', or `draw'.

`draw'
`adjourn'
`abort'
     asks your opponent to terminate a game by mutual agreement.
     Adjourned games can be continued later.  Your opponent can either
     `decline' your offer or accept it (by typing the same command or
     typing `accept').  In some cases these commands work immediately,
     without asking your opponent to agree.  For example, you can abort
     the game unilaterally if your opponent is out of time, and you can
     claim a draw by repetition or the 50-move rule if available simply
     by typing `draw'.

`finger <player>'
     to get information about the given <player>. (Default: yourself.)

`vars'
     to get a list of personal settings

`set <var> <value>'
     to modify these settings

`observe <player>'
     to observe an ongoing game of the given <player>.

`examine'
`oldmoves'
     to review a recently completed game

   Some special XBoard features are activated when you are in examine
mode on ICS.  See the descriptions of the menu commands `Forward',
`Backward', `Pause', `ICS Client', and `Stop Examining' on the *note
Edit Menu::, *note Mode Menu::, and *note Action Menu::.

5 Firewalls
***********

By default, XBoard communicates with an Internet Chess Server by
opening a TCP socket directly from the machine it is running on to the
ICS. If there is a firewall between your machine and the ICS, this
won't work. Here are some recipes for getting around common kinds of
firewalls using special options to XBoard.  Important: See the
paragraph in the below about extra echoes, in *note Limitations::.

   Suppose that you can't telnet directly to ICS, but you can telnet to
a firewall host, log in, and then telnet from there to ICS.  Let's say
the firewall is called `firewall.example.com'. Set command-line options
as follows:

     xboard -ics -icshost firewall.example.com -icsport 23
   Or in your `.Xresources' file:

     XBoard*internetChessServerHost: firewall.example.com
     XBoard*internetChessServerPort: 23
   Then when you run XBoard in ICS mode, you will be prompted to log in
to the firewall host. This works because port 23 is the standard telnet
login service. Do so, then telnet to ICS, using a command like `telnet
chessclub.com 5000', or whatever command the firewall provides for
telnetting to port 5000.

   If your firewall lets you telnet (or rlogin) to remote hosts but
doesn't let you telnet to port 5000, you may be able to connect to the
chess server on port 23 instead, which is the port the telnet program
uses by default.  Some chess servers support this (including
chessclub.com and freechess.org), while some do not.

   If your chess server does not allow connections on port 23 and your
firewall does not allow you to connect to other ports, you may be able
to connect by hopping through another host outside the firewall that
you have an account on.  For instance, suppose you have a shell account
at `foo.edu'. Follow the recipe above, but instead of typing `telnet
chessclub.com 5000' to the firewall, type `telnet foo.edu' (or `rlogin
foo.edu'), log in there, and then type `telnet chessclub.com 5000'.

   Suppose that you can't telnet directly to ICS, but you can use rsh
to run programs on a firewall host, and that host can telnet to ICS.
Let's say the firewall is called `rsh.example.com'. Set command-line
options as follows:

     xboard -ics -gateway rsh.example.com -icshost chessclub.com

Or in your `.Xresources' file:

     XBoard*gateway: rsh.example.com
     XBoard*internetChessServerHost: chessclub.com

   Then when you run XBoard in ICS mode, it will connect to the ICS by
using `rsh' to run the command `telnet chessclub.com 5000' on host
`rsh.example.com'.

   Suppose that you can telnet anywhere you want, but you have to run a
special program called `ptelnet' to do so.

   First, we'll consider the easy case, in which `ptelnet chessclub.com
5000' gets you to the chess server.  In this case set command line
options as follows:

     xboard -ics -telnet -telnetProgram ptelnet

Or in your `.Xresources' file:

     XBoard*useTelnet: true
     XBoard*telnetProgram: ptelnet

Then when you run XBoard in ICS mode, it will issue the command
`ptelnet chessclub.com 5000' to connect to the ICS.

   Next, suppose that `ptelnet chessclub.com 5000' doesn't work; that
is, your `ptelnet' program doesn't let you connect to alternative
ports. As noted above, your chess server may allow you to connect on
port 23 instead.  In that case, just add the option `-icsport ""' to
the above command, or add `XBoard*internetChessServerPort:' to your
`.Xresources' file.  But if your chess server doesn't let you connect
on port 23, you will have to find some other host outside the firewall
and hop through it. For instance, suppose you have a shell account at
`foo.edu'. Set command line options as follows:

     xboard -ics -telnet -telnetProgram ptelnet -icshost foo.edu -icsport ""

Or in your `.Xresources' file:

     XBoard*useTelnet: true
     XBoard*telnetProgram: ptelnet
     XBoard*internetChessServerHost: foo.edu
     XBoard*internetChessServerPort:

Then when you run XBoard in ICS mode, it will issue the command
`ptelnet foo.edu' to connect to your account at `foo.edu'. Log in
there, then type `telnet chessclub.com 5000'.

   ICC timestamp and FICS timeseal do not work through some firewalls.
You can use them only if your firewall gives a clean TCP connection
with a full 8-bit wide path.  If your firewall allows you to get out
only by running a special telnet program, you can't use timestamp or
timeseal across it.  But if you have access to a computer just outside
your firewall, and you have much lower netlag when talking to that
computer than to the ICS, it might be worthwhile running timestamp
there.  Follow the instructions above for hopping through a host
outside the firewall (foo.edu in the example), but run timestamp or
timeseal on that host instead of telnet.

   Suppose that you have a SOCKS firewall that will give you a clean
8-bit wide TCP connection to the chess server, but only after you
authenticate yourself via the SOCKS protocol.  In that case, you could
make a socksified version of XBoard and run that.  If you are using
timestamp or timeseal, you will to socksify it, not XBoard; this may be
difficult seeing that ICC and FICS do not provide source code for these
programs.  Socksification is beyond the scope of this document, but see
the SOCKS Web site at http://www.socks.permeo.com/.  If you are missing
SOCKS, try http://www.funbureau.com/.

6 Environment variables
***********************

Game and position files are found in a directory named by the
`CHESSDIR' environment variable. If this variable is not set, the
current working directory is used. If `CHESSDIR' is set, XBoard
actually changes its working directory to `$CHESSDIR', so any files
written by the chess engine will be placed there too.

7 Limitations and known bugs
****************************

There is no way for two people running copies of XBoard to play each
other without going through an Internet Chess Server.

   Under some circumstances, your ICS password may be echoed when you
log on.

   If you are connecting to the ICS by running telnet on an Internet
provider or firewall host, you may find that each line you type is
echoed back an extra time after you hit <Enter>. If your Internet
provider is a Unix system, you can probably turn its echo off by typing
`stty -echo' after you log in, and/or typing <^E><Enter> (Ctrl+E
followed by the Enter key) to the telnet program after you have logged
into ICS.  It is a good idea to do this if you can, because the extra
echo can occasionally confuse XBoard's parsing routines.

   The game parser recognizes only algebraic notation.

   Many of the following points used to be limitations in XBoard 4.2.7
and earlier, but are now fixed: The internal move legality tester in
XBoard 4.3.xx does look at the game history, and is fully aware of
castling or en-passant-capture rights. It permits castling with the
king on the d file because this is possible in some "wild 1" games on
ICS.  The piece-drop menu does not check piece drops in bughouse to see
if you actually hold the piece you are trying to drop. But this way of
dropping pieces should be considered an obsolete feature, now that
pieces can be dropped by dragging them from the holdings to the board.
Anyway, if you would attempt an illegal move when using a chess engine
or the ICS, XBoard will accept the error message that comes back, undo
the move, and let you try another.  FEN positions saved by XBoard do
include correct information about whether castling or en passant are
legal, and also handle the 50-move counter.  The mate detector does not
understand that non-contact mate is not really mate in bughouse.  The
only problem this causes while playing is minor: a "#" (mate indicator)
character will show up after a non-contact mating move in the move
list. XBoard will not assume the game is over at that point, not even
when the option Detect Mates is on.  Edit Game mode always uses the
rules of the selected variant, which can be a variant that uses piece
drops.  You can load and edit games that contain piece drops.  The
(obsolete) piece menus are not active, but you can perform piece drops
by dragging pieces from the holdings.  Fischer Random castling is fully
understood.  You can enter castlings by dragging the King on top of
your Rook.  You can probably also play Fischer Random successfully on
ICS by typing castling moves into the ICS Interaction window.

   The menus may not work if your keyboard is in Caps Lock or Num Lock
mode.  This seems to be a problem with the Athena menu widget, not an
XBoard bug.

   Also see the ToDo file included with the distribution for many other
possible bugs, limitations, and ideas for improvement that have been
suggested.

8 Reporting problems
********************

You can report bugs and problems with XBoard using the bug tracker at
`https://savannah.gnu.org/projects/xboard/' or by sending mail to
`<bug-xboard@gnu.org>'.  It can also be useful to report or discuss
bugs in the WinBoard Forum at `http://www.open-aurec.com/wbforum/',
WinBoard development section.

   Please use the `script' program to start a typescript, run XBoard
with the `-debug' option, and include the typescript output in your
message.  Also tell us what kind of machine and what operating system
version you are using.  The command `uname -a' will often tell you this.

   If you improve XBoard, please send a message about your changes, and
we will get in touch with you about merging them in to the main line of
development.

9 Authors and contributors
**************************

Chris Sears and Dan Sears wrote the original XBoard.  They were
responsible for versions 1.0 through 1.2.  The color scheme was taken
from Wayne Christopher's `XChess' program.

   Tim Mann was primarily responsible for XBoard versions 1.3 through
4.2.7, and for WinBoard (a port of XBoard to Microsoft Win32) from its
inception through version 4.2.7.

   John Chanak contributed the initial implementation of ICS mode.  Evan
Welsh wrote `CMail', and Patrick Surry helped in designing, testing,
and documenting it.  Elmar Bartel contributed the new piece bitmaps
introduced in version 3.2.  Jochen Wiedmann converted the documentation
to texinfo.  Frank McIngvale added click/click moving, the Analysis
modes, piece flashing, ZIICS import, and ICS text colorization to
XBoard.  Hugh Fisher added animated piece movement to XBoard, and
Henrik Gram added it to WinBoard.  Mark Williams contributed the
initial (WinBoard-only) implementation of many new features added to
both XBoard and WinBoard in version 4.1.0, including copy/paste,
premove, icsAlarm, autoFlipView, training mode, auto raise, and
blindfold.  Ben Nye contributed X copy/paste code for XBoard.

   In a fork from version 4.2.7, Alessandro Scotti added many elements
to the user interface of WinBoard, including the board textures and
font-based rendering, the evaluation-graph, move-history and
engine-output window.  He was also responsible for adding the UCI
support.

   H. G. Muller continued this fork of the project, producing version
4.3.  He made WinBoard castling- and e.p.-aware, added variant support
with adjustable board sizes, the crazyhouse holdings, and the fairy
pieces.  In addition he added most of the adjudication options, made
WinBoard more robust in dealing with buggy and crashing engines, and
extended time control with a time-odds and node-count-based modes.
Most of the options that initially were WinBoard only have now been
back-ported to XBoard.

   Michel van den Bergh provided the code for reading Polyglot opening
books.

   Meanwhile, some work continued on the GNU XBoard project maintained
at savannah.gnu.org, but version 4.2.8 was never released.  Daniel
Mehrmann was responsible for much of this work.

   Most recently, Arun Persaud worked with H. G. Muller to merge all
the features of the never-released XBoard/WinBoard 4.2.8 of the GNU
XBoard project and the never-released 4.3.16 from H. G.'s fork into a
unified XBoard/WinBoard 4.4, which is now available both from the
savannah.gnu.org web site and the WinBoard forum.

10 CMail
********

The `cmail' program can help you play chess by email with opponents of
your choice using XBoard as an interface.

   You will usually run `cmail' without giving any options.

10.1 CMail options
==================

-h
     Displays `cmail' usage information.

-c
     Shows the conditions of the GNU General Public License.  *Note
     Copying::.

-w
     Shows the warranty notice of the GNU General Public License.
     *Note Copying::.

-v
-xv
     Provides or inhibits verbose output from `cmail' and XBoard,
     useful for debugging. The `-xv' form also inhibits the cmail
     introduction message.

-mail
-xmail
     Invokes or inhibits the sending of a mail message containing the
     move.

-xboard
-xxboard
     Invokes or inhibits the running of XBoard on the game file.

-reuse
-xreuse
     Invokes or inhibits the reuse of an existing XBoard to display the
     current game.

-remail
     Resends the last mail message for that game. This inhibits running
     XBoard.

-game <name>
     The name of the game to be processed.

-wgames <number>
-bgames <number>
-games <number>
     Number of games to start as White, as Black or in total. Default
     is 1 as white and none as black. If only one color is specified
     then none of the other color is assumed. If no color is specified
     then equal numbers of White and Black games are started, with the
     extra game being as White if an odd number of total games is
     specified.

-me <short name>
-opp <short name>
     A one-word alias for yourself or your opponent.

-wname <full name>
-bname <full name>
-name <full name>
-oppname <full name>
     The full name of White, Black, yourself or your opponent.

-wna <net address>
-bna <net address>
-na <net address>
-oppna <net address>
     The email address of White, Black, yourself or your opponent.

-dir <directory>
     The directory in which `cmail' keeps its files. This defaults to
     the environment variable `$CMAIL_DIR' or failing that, `$CHESSDIR',
     `$HOME/Chess' or `~/Chess'. It will be created if it does not
     exist.

-arcdir <directory>
     The directory in which `cmail' archives completed games. Defaults
     to the environment variable `$CMAIL_ARCDIR' or, in its absence,
     the same directory as cmail keeps its working files (above).

-mailprog <mail program>
     The program used by cmail to send email messages. This defaults to
     the environment variable `$CMAIL_MAILPROG' or failing that
     `/usr/ucb/Mail', `/usr/ucb/mail' or `Mail'. You will need to set
     this variable if none of the above paths fit your system.

-logFile <file>
     A file in which to dump verbose debugging messages that are
     invoked with the `-v' option.

-event <event>
     The PGN Event tag (default `Email correspondence game').

-site <site>
     The PGN Site tag (default `NET').

-round <round>
     The PGN Round tag (default `-', not applicable).

-mode <mode>
     The PGN Mode tag (default `EM', Electronic Mail).

Other options
     Any option flags not listed above are passed through to XBoard.
     Invoking XBoard through CMail changes the default values of two
     XBoard options: The default value for `-noChessProgram' is changed
     to true; that is, by default no chess engine is started.  The
     default value for `-timeDelay' is changed to 0; that is, by default
     XBoard immediately goes to the end of the game as played so far,
     rather than stepping through the moves one by one.  You can still
     set these options to whatever values you prefer by supplying them
     on CMail's command line.  *Note Options::.

10.2 Starting a CMail Game
==========================

Type `cmail' from a shell to start a game as white. After an opening
message, you will be prompted for a game name, which is optional--if you
simply press <Enter>, the game name will take the form
`you-VS-opponent'. You will next be prompted for the short name of your
opponent. If you haven't played this person before, you will also be
prompted for his/her email address. `cmail' will then invoke XBoard in
the background. Make your first move and select `Mail Move' from the
`File' menu. *Note File Menu::. If all is well, `cmail' will mail a
copy of the move to your opponent. If you select `Exit' without having
selected `Mail Move' then no move will be made.

10.3 Answering a Move
=====================

When you receive a message from an opponent containing a move in one of
your games, simply pipe the message through `cmail'. In some mailers
this is as simple as typing `| cmail' when viewing the message, while in
others you may have to save the message to a file and do `cmail < file'
at the command line. In either case `cmail' will display the game using
XBoard. If you didn't exit XBoard when you made your first move then
`cmail' will do its best to use the existing XBoard instead of starting
a new one. As before, simply make a move and select `Mail Move' from
the `File' menu. *Note File Menu::. `cmail' will try to use the XBoard
that was most recently used to display the current game. This means
that many games can be in progress simultaneously, each with its own
active XBoard.

   If you want to look at the history or explore a variation, go ahead,
but you must return to the current position before XBoard will allow you
to mail a move. If you edit the game's history you must select `Reload
Same Game' from the `File' menu to get back to the original position,
then make the move you want and select `Mail Move'.  As before, if you
decide you aren't ready to make a move just yet you can either select
`Exit' without sending a move or just leave XBoard running until you
are ready.

10.4 Multi-Game Messages
========================

It is possible to have a `cmail' message carry more than one game.
This feature was implemented to handle IECG (International Email Chess
Group) matches, where a match consists of one game as white and one as
black, with moves transmitted simultaneously. In case there are more
general uses, `cmail' itself places no limit on the number of
black/white games contained in a message; however, XBoard does.

10.5 Completing a Game
======================

Because XBoard can detect checkmate and stalemate, `cmail' handles game
termination sensibly. As well as resignation, the `Action' menu allows
draws to be offered and accepted for `cmail' games.

   For multi-game messages, only unfinished and just-finished games
will be included in email messages. When all the games are finished,
they are archived in the user's archive directory, and similarly in the
opponent's when he or she pipes the final message through `cmail'. The
archive file name includes the date the game was started.

10.6 Known CMail Problems
=========================

It's possible that a strange conjunction of conditions may occasionally
mean that `cmail' has trouble reactivating an existing XBoard. If this
should happen, simply trying it again should work.  If not, remove the
file that stores the XBoard's PID (`game.pid') or use the `-xreuse'
option to force `cmail' to start a new XBoard.

   Versions of `cmail' after 2.16 no longer understand the old file
format that XBoard used to use and so cannot be used to correspond with
anyone using an older version.

   Versions of `cmail' older than 2.11 do not handle multi-game
messages, so multi-game correspondence is not possible with opponents
using an older version.

11 Other programs you can use with XBoard
*****************************************

Here are some other programs you can use with XBoard

11.1 GNU Chess
==============

The GNU Chess engine is available from:

   ftp://ftp.gnu.org/gnu/gnuchess/

   You can use XBoard to play a game against GNU Chess, or to interface
GNU Chess to an ICS.

11.2 Fairy-Max
==============

Fairy-Max is a derivative from the once World's smallest Chess program
micro-Max, which measures only about 100 lines of source code.  The
main difference with micro-Max is that Fairy-Max loads its
move-generator tables from a file, so that the rules for piece movement
can be easily configured to implement unorthodox pieces.  Fairy-Max can
therefore play a large number of variants, normal Chess being one of
those.  In addition it plays Knightmate, Capablanca and Gothic Chess,
Shatranj, Courier Chess, Cylinder chess, Berolina Chess, while the user
can easily define new variants.  It can be obtained from:

   http://home.hccnet.nl/h.g.muller/dwnldpage.html

11.3 HoiChess
=============

HoiChess is a not-so-very-strong Chess engine, which comes with a
derivative HoiXiangqi, able to play Chinese Chess. It can be obtained
from the standard Linux repositories through:

   sudo apt-get install hoichess

11.4 Crafty
===========

Crafty is a chess engine written by Bob Hyatt.  You can use XBoard to
play a game against Crafty, hook Crafty up to an ICS, or use Crafty to
interactively analyze games and positions for you.

   Crafty is a strong, rapidly evolving chess program. This rapid pace
of development is good, because it means Crafty is always getting
better.  This can sometimes cause problems with backwards
compatibility, but usually the latest version of Crafty will work well
with the latest version of XBoard.  Crafty can be obtained from its
author's FTP site: ftp://ftp.cis.uab.edu/hyatt/.

   To use Crafty with XBoard, give the -fcp and -fd options as follows,
where <crafty's directory> is the directory in which you installed
Crafty and placed its book and other support files.

11.5 zic2xpm
============

The "zic2xpm" program is used to import chess sets from the ZIICS(*)
program into XBoard. "zic2xpm" is part of the XBoard distribution.
ZIICS is available from:

   ftp://ftp.freechess.org/pub/chess/DOS/ziics131.exe

   To import ZIICS pieces, do this:
1. Unzip ziics131.exe into a directory:
          unzip -L ziics131.exe -d ~/ziics

2. Use zic2xpm to convert a set of pieces to XBoard format.
     For example, let's say you want to use the FRITZ4 set. These files
     are named "fritz4.*" in the ZIICS distribution.

          mkdir ~/fritz4
          cd ~/fritz4
          zic2xpm ~/ziics/fritz4.*

3. Give XBoard the "-pixmap" option when starting up, e.g.:
          xboard -pixmap ~/fritz4

     Alternatively, you can add this line to your `.Xresources' file:

          xboard*pixmapDirectory: ~/fritz4

   (*) ZIICS is a separate copyrighted work of Andy McFarland.  The
"ZIICS pieces" are copyrighted works of their respective creators.
Files produced by "zic2xpm" are for PERSONAL USE ONLY and may NOT be
redistributed without explicit permission from the original creator(s)
of the pieces.

Copyright
*********

Copyright (C) 1991 Digital Equipment Corporation, Maynard,
Massachusetts.

   All Rights Reserved.

   Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be used in
advertising or publicity pertaining to distribution of the software
without specific, written prior permission.

   Digital disclaims all warranties with regard to this software,
including all implied warranties of merchantability and fitness.  In no
event shall Digital be liable for any special, indirect or
consequential damages or any damages whatsoever resulting from loss of
use, data or profits, whether in an action of contract, negligence or
other tortious action, arising out of or in connection with the use or
performance of this software.

   Enhancements copyright (C) 1992-2003, 2004, 2005, 2006, 2007, 2008,
2009, 2010, 2011 Free Software Foundation, Inc.

Published by the Free Software Foundation
59 Temple Place - Suite 330
Boston, MA 02111-1307 USA

   Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

   Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the section entitled "GNU General Public License," is included
exactly as in the original, and provided that the entire resulting
derived work is distributed under the terms of a permission notice
identical to this one.

   Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the section entitled "GNU General Public License,"
and this permission notice, may be included in translations approved by
the Free Software Foundation instead of in the original English.

GNU GENERAL PUBLIC LICENSE
**************************

                        Version 3, 29 June 2007

     Copyright (C) 2007 Free Software Foundation, Inc. `http://fsf.org/'

     Everyone is permitted to copy and distribute verbatim copies of this
     license document, but changing it is not allowed.

Preamble
========

The GNU General Public License is a free, copyleft license for software
and other kinds of works.

   The licenses for most software and other practical works are designed
to take away your freedom to share and change the works.  By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains
free software for all its users.  We, the Free Software Foundation, use
the GNU General Public License for most of our software; it applies
also to any other work released this way by its authors.  You can apply
it to your programs, too.

   When we speak of free software, we are referring to freedom, not
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   To protect your rights, we need to prevent others from denying you
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   For example, if you distribute copies of such a program, whether
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   Developers that use the GNU GPL protect your rights with two steps:
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   For the developers' and authors' protection, the GPL clearly explains
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   Some devices are designed to deny users access to install or run
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TERMS AND CONDITIONS
====================

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     the conditions stated below.  Sublicensing is not allowed; section
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  3. Protecting Users' Legal Rights From Anti-Circumvention Law.

     No covered work shall be deemed part of an effective technological
     measure under any applicable law fulfilling obligations under
     article 11 of the WIPO copyright treaty adopted on 20 December
     1996, or similar laws prohibiting or restricting circumvention of
     such measures.

     When you convey a covered work, you waive any legal power to forbid
     circumvention of technological measures to the extent such
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     with respect to the covered work, and you disclaim any intention
     to limit operation or modification of the work as a means of
     enforcing, against the work's users, your or third parties' legal
     rights to forbid circumvention of technological measures.

  4. Conveying Verbatim Copies.

     You may convey verbatim copies of the Program's source code as you
     receive it, in any medium, provided that you conspicuously and
     appropriately publish on each copy an appropriate copyright notice;
     keep intact all notices stating that this License and any
     non-permissive terms added in accord with section 7 apply to the
     code; keep intact all notices of the absence of any warranty; and
     give all recipients a copy of this License along with the Program.

     You may charge any price or no price for each copy that you convey,
     and you may offer support or warranty protection for a fee.

  5. Conveying Modified Source Versions.

     You may convey a work based on the Program, or the modifications to
     produce it from the Program, in the form of source code under the
     terms of section 4, provided that you also meet all of these
     conditions:

       a. The work must carry prominent notices stating that you
          modified it, and giving a relevant date.

       b. The work must carry prominent notices stating that it is
          released under this License and any conditions added under
          section 7.  This requirement modifies the requirement in
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       c. You must license the entire work, as a whole, under this
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       d. If the work has interactive user interfaces, each must display
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     A compilation of a covered work with other separate and independent
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     copyright are not used to limit the access or legal rights of the
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     Inclusion of a covered work in an aggregate does not cause this
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  6. Conveying Non-Source Forms.

     You may convey a covered work in object code form under the terms
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       a. Convey the object code in, or embodied in, a physical product
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          Corresponding Source fixed on a durable physical medium
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       b. Convey the object code in, or embodied in, a physical product
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          product model, to give anyone who possesses the object code
          either (1) a copy of the Corresponding Source for all the
          software in the product that is covered by this License, on a
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          interchange, for a price no more than your reasonable cost of
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       c. Convey individual copies of the object code with a copy of
          the written offer to provide the Corresponding Source.  This
          alternative is allowed only occasionally and noncommercially,
          and only if you received the object code with such an offer,
          in accord with subsection 6b.

       d. Convey the object code by offering access from a designated
          place (gratis or for a charge), and offer equivalent access
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          If the place to copy the object code is a network server, the
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       e. Convey the object code using peer-to-peer transmission,
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     A separable portion of the object code, whose source code is
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     A "User Product" is either (1) a "consumer product", which means
     any tangible personal property which is normally used for personal,
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     "Installation Information" for a User Product means any methods,
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     The information must suffice to ensure that the continued
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     If you convey an object code work under this section in, or with,
     or specifically for use in, a User Product, and the conveying
     occurs as part of a transaction in which the right of possession
     and use of the User Product is transferred to the recipient in
     perpetuity or for a fixed term (regardless of how the transaction
     is characterized), the Corresponding Source conveyed under this
     section must be accompanied by the Installation Information.  But
     this requirement does not apply if neither you nor any third party
     retains the ability to install modified object code on the User
     Product (for example, the work has been installed in ROM).

     The requirement to provide Installation Information does not
     include a requirement to continue to provide support service,
     warranty, or updates for a work that has been modified or
     installed by the recipient, or for the User Product in which it
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     Corresponding Source conveyed, and Installation Information
     provided, in accord with this section must be in a format that is
     publicly documented (and with an implementation available to the
     public in source code form), and must require no special password
     or key for unpacking, reading or copying.

  7. Additional Terms.

     "Additional permissions" are terms that supplement the terms of
     this License by making exceptions from one or more of its
     conditions.  Additional permissions that are applicable to the
     entire Program shall be treated as though they were included in
     this License, to the extent that they are valid under applicable
     law.  If additional permissions apply only to part of the Program,
     that part may be used separately under those permissions, but the
     entire Program remains governed by this License without regard to
     the additional permissions.

     When you convey a copy of a covered work, you may at your option
     remove any additional permissions from that copy, or from any part
     of it.  (Additional permissions may be written to require their own
     removal in certain cases when you modify the work.)  You may place
     additional permissions on material, added by you to a covered work,
     for which you have or can give appropriate copyright permission.

     Notwithstanding any other provision of this License, for material
     you add to a covered work, you may (if authorized by the copyright
     holders of that material) supplement the terms of this License
     with terms:

       a. Disclaiming warranty or limiting liability differently from
          the terms of sections 15 and 16 of this License; or

       b. Requiring preservation of specified reasonable legal notices
          or author attributions in that material or in the Appropriate
          Legal Notices displayed by works containing it; or

       c. Prohibiting misrepresentation of the origin of that material,
          or requiring that modified versions of such material be
          marked in reasonable ways as different from the original
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       d. Limiting the use for publicity purposes of names of licensors
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       e. Declining to grant rights under trademark law for use of some
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       f. Requiring indemnification of licensors and authors of that
          material by anyone who conveys the material (or modified
          versions of it) with contractual assumptions of liability to
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          assumptions directly impose on those licensors and authors.

     All other non-permissive additional terms are considered "further
     restrictions" within the meaning of section 10.  If the Program as
     you received it, or any part of it, contains a notice stating that
     it is governed by this License along with a term that is a further
     restriction, you may remove that term.  If a license document
     contains a further restriction but permits relicensing or
     conveying under this License, you may add to a covered work
     material governed by the terms of that license document, provided
     that the further restriction does not survive such relicensing or
     conveying.

     If you add terms to a covered work in accord with this section, you
     must place, in the relevant source files, a statement of the
     additional terms that apply to those files, or a notice indicating
     where to find the applicable terms.

     Additional terms, permissive or non-permissive, may be stated in
     the form of a separately written license, or stated as exceptions;
     the above requirements apply either way.

  8. Termination.

     You may not propagate or modify a covered work except as expressly
     provided under this License.  Any attempt otherwise to propagate or
     modify it is void, and will automatically terminate your rights
     under this License (including any patent licenses granted under
     the third paragraph of section 11).

     However, if you cease all violation of this License, then your
     license from a particular copyright holder is reinstated (a)
     provisionally, unless and until the copyright holder explicitly
     and finally terminates your license, and (b) permanently, if the
     copyright holder fails to notify you of the violation by some
     reasonable means prior to 60 days after the cessation.

     Moreover, your license from a particular copyright holder is
     reinstated permanently if the copyright holder notifies you of the
     violation by some reasonable means, this is the first time you have
     received notice of violation of this License (for any work) from
     that copyright holder, and you cure the violation prior to 30 days
     after your receipt of the notice.

     Termination of your rights under this section does not terminate
     the licenses of parties who have received copies or rights from
     you under this License.  If your rights have been terminated and
     not permanently reinstated, you do not qualify to receive new
     licenses for the same material under section 10.

  9. Acceptance Not Required for Having Copies.

     You are not required to accept this License in order to receive or
     run a copy of the Program.  Ancillary propagation of a covered work
     occurring solely as a consequence of using peer-to-peer
     transmission to receive a copy likewise does not require
     acceptance.  However, nothing other than this License grants you
     permission to propagate or modify any covered work.  These actions
     infringe copyright if you do not accept this License.  Therefore,
     by modifying or propagating a covered work, you indicate your
     acceptance of this License to do so.

 10. Automatic Licensing of Downstream Recipients.

     Each time you convey a covered work, the recipient automatically
     receives a license from the original licensors, to run, modify and
     propagate that work, subject to this License.  You are not
     responsible for enforcing compliance by third parties with this
     License.

     An "entity transaction" is a transaction transferring control of an
     organization, or substantially all assets of one, or subdividing an
     organization, or merging organizations.  If propagation of a
     covered work results from an entity transaction, each party to that
     transaction who receives a copy of the work also receives whatever
     licenses to the work the party's predecessor in interest had or
     could give under the previous paragraph, plus a right to
     possession of the Corresponding Source of the work from the
     predecessor in interest, if the predecessor has it or can get it
     with reasonable efforts.

     You may not impose any further restrictions on the exercise of the
     rights granted or affirmed under this License.  For example, you
     may not impose a license fee, royalty, or other charge for
     exercise of rights granted under this License, and you may not
     initiate litigation (including a cross-claim or counterclaim in a
     lawsuit) alleging that any patent claim is infringed by making,
     using, selling, offering for sale, or importing the Program or any
     portion of it.

 11. Patents.

     A "contributor" is a copyright holder who authorizes use under this
     License of the Program or a work on which the Program is based.
     The work thus licensed is called the contributor's "contributor
     version".

     A contributor's "essential patent claims" are all patent claims
     owned or controlled by the contributor, whether already acquired or
     hereafter acquired, that would be infringed by some manner,
     permitted by this License, of making, using, or selling its
     contributor version, but do not include claims that would be
     infringed only as a consequence of further modification of the
     contributor version.  For purposes of this definition, "control"
     includes the right to grant patent sublicenses in a manner
     consistent with the requirements of this License.

     Each contributor grants you a non-exclusive, worldwide,
     royalty-free patent license under the contributor's essential
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     otherwise run, modify and propagate the contents of its
     contributor version.

     In the following three paragraphs, a "patent license" is any
     express agreement or commitment, however denominated, not to
     enforce a patent (such as an express permission to practice a
     patent or covenant not to sue for patent infringement).  To
     "grant" such a patent license to a party means to make such an
     agreement or commitment not to enforce a patent against the party.

     If you convey a covered work, knowingly relying on a patent
     license, and the Corresponding Source of the work is not available
     for anyone to copy, free of charge and under the terms of this
     License, through a publicly available network server or other
     readily accessible means, then you must either (1) cause the
     Corresponding Source to be so available, or (2) arrange to deprive
     yourself of the benefit of the patent license for this particular
     work, or (3) arrange, in a manner consistent with the requirements
     of this License, to extend the patent license to downstream
     recipients.  "Knowingly relying" means you have actual knowledge
     that, but for the patent license, your conveying the covered work
     in a country, or your recipient's use of the covered work in a
     country, would infringe one or more identifiable patents in that
     country that you have reason to believe are valid.

     If, pursuant to or in connection with a single transaction or
     arrangement, you convey, or propagate by procuring conveyance of, a
     covered work, and grant a patent license to some of the parties
     receiving the covered work authorizing them to use, propagate,
     modify or convey a specific copy of the covered work, then the
     patent license you grant is automatically extended to all
     recipients of the covered work and works based on it.

     A patent license is "discriminatory" if it does not include within
     the scope of its coverage, prohibits the exercise of, or is
     conditioned on the non-exercise of one or more of the rights that
     are specifically granted under this License.  You may not convey a
     covered work if you are a party to an arrangement with a third
     party that is in the business of distributing software, under
     which you make payment to the third party based on the extent of
     your activity of conveying the work, and under which the third
     party grants, to any of the parties who would receive the covered
     work from you, a discriminatory patent license (a) in connection
     with copies of the covered work conveyed by you (or copies made
     from those copies), or (b) primarily for and in connection with
     specific products or compilations that contain the covered work,
     unless you entered into that arrangement, or that patent license
     was granted, prior to 28 March 2007.

     Nothing in this License shall be construed as excluding or limiting
     any implied license or other defenses to infringement that may
     otherwise be available to you under applicable patent law.

 12. No Surrender of Others' Freedom.

     If conditions are imposed on you (whether by court order,
     agreement or otherwise) that contradict the conditions of this
     License, they do not excuse you from the conditions of this
     License.  If you cannot convey a covered work so as to satisfy
     simultaneously your obligations under this License and any other
     pertinent obligations, then as a consequence you may not convey it
     at all.  For example, if you agree to terms that obligate you to
     collect a royalty for further conveying from those to whom you
     convey the Program, the only way you could satisfy both those
     terms and this License would be to refrain entirely from conveying
     the Program.

 13. Use with the GNU Affero General Public License.

     Notwithstanding any other provision of this License, you have
     permission to link or combine any covered work with a work licensed
     under version 3 of the GNU Affero General Public License into a
     single combined work, and to convey the resulting work.  The terms
     of this License will continue to apply to the part which is the
     covered work, but the special requirements of the GNU Affero
     General Public License, section 13, concerning interaction through
     a network will apply to the combination as such.

 14. Revised Versions of this License.

     The Free Software Foundation may publish revised and/or new
     versions of the GNU General Public License from time to time.
     Such new versions will be similar in spirit to the present
     version, but may differ in detail to address new problems or
     concerns.

     Each version is given a distinguishing version number.  If the
     Program specifies that a certain numbered version of the GNU
     General Public License "or any later version" applies to it, you
     have the option of following the terms and conditions either of
     that numbered version or of any later version published by the
     Free Software Foundation.  If the Program does not specify a
     version number of the GNU General Public License, you may choose
     any version ever published by the Free Software Foundation.

     If the Program specifies that a proxy can decide which future
     versions of the GNU General Public License can be used, that
     proxy's public statement of acceptance of a version permanently
     authorizes you to choose that version for the Program.

     Later license versions may give you additional or different
     permissions.  However, no additional obligations are imposed on any
     author or copyright holder as a result of your choosing to follow a
     later version.

 15. Disclaimer of Warranty.

     THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
     APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE
     COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
     WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE
     RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.
     SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
     NECESSARY SERVICING, REPAIR OR CORRECTION.

 16. Limitation of Liability.

     IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
     WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES
     AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
     FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
     CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
     THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA
     BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
     PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
     PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF
     THE POSSIBILITY OF SUCH DAMAGES.

 17. Interpretation of Sections 15 and 16.

     If the disclaimer of warranty and limitation of liability provided
     above cannot be given local legal effect according to their terms,
     reviewing courts shall apply local law that most closely
     approximates an absolute waiver of all civil liability in
     connection with the Program, unless a warranty or assumption of
     liability accompanies a copy of the Program in return for a fee.


END OF TERMS AND CONDITIONS
===========================

How to Apply These Terms to Your New Programs
=============================================

If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.

   To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.

     ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES.
     Copyright (C) YEAR NAME OF AUTHOR

     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or (at
     your option) any later version.

     This program is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program.  If not, see `http://www.gnu.org/licenses/'.

   Also add information on how to contact you by electronic and paper
mail.

   If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

     PROGRAM Copyright (C) YEAR NAME OF AUTHOR
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.

   The hypothetical commands `show w' and `show c' should show the
appropriate parts of the General Public License.  Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".

   You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  For more information on this, and how to apply and follow
the GNU GPL, see `http://www.gnu.org/licenses/'.

   The GNU General Public License does not permit incorporating your
program into proprietary programs.  If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library.  If this is what you want to do, use the
GNU Lesser General Public License instead of this License.  But first,
please read `http://www.gnu.org/philosophy/why-not-lgpl.html'.

Index
*****

-animateSpeed, option:                         See 3.5.      (line 2100)
-autoDisplayComment, option:                   See 3.5.      (line 2105)
-autoDisplayTags, option:                      See 3.5.      (line 2105)
-pasteSelection, option:                       See 3.5.      (line 2111)
.icsrc:                                        See 3.3.      (line 1517)
<, Button:                                     See 2.2.      (line  348)
<<, Button:                                    See 2.2.      (line  381)
>, Button:                                     See 2.2.      (line  368)
>>, Button:                                    See 2.2.      (line  400)
abort, ICS command:                            See 4.        (line 2414)
Abort, Menu Item:                              See 2.5.      (line  618)
About XBoard, Menu Item:                       See 2.8.      (line 1019)
accept, ICS command:                           See 4.        (line 2401)
Accept, Menu Item:                             See 2.5.      (line  590)
Action, Menu:                                  See 2.5.      (line  589)
adjourn, ICS command:                          See 4.        (line 2414)
Adjourn, Menu Item:                            See 2.5.      (line  613)
Adjudicate Draw, Menu Item:                    See 2.5.      (line  646)
Adjudicate to Black, Menu Item:                See 2.5.      (line  646)
Adjudicate to White, Menu Item:                See 2.5.      (line  646)
adjudicateDrawMoves, option:                   See 3.6.      (line 2127)
adjudicateLossThreshold, option:               See 3.6.      (line 2119)
Adjudications, Menu Item:                      See 2.7.      (line  727)
alarm, option:                                 See 3.3.      (line 1605)
Always Queen, Menu Item:                       See 2.7.      (line  754)
alwaysPromoteToQueen, option:                  See 3.5.      (line 1881)
Analysis Mode, Menu Item:                      See 2.4.      (line  483)
Analyze File, Menu Item:                       See 2.4.      (line  505)
Animate Dragging, Menu Item:                   See 2.7.      (line  761)
Animate Moving, Menu Item:                     See 2.7.      (line  768)
animate, option:                               See 3.5.      (line 2096)
animateDragging, option:                       See 3.5.      (line 2092)
animateMoving, option:                         See 3.5.      (line 2096)
Annotate, Menu Item:                           See 2.2.      (line  324)
at sign, option:                               See 3.4.      (line 1834)
Authors:                                       See 9.        (line 2646)
Auto Comment, Menu Item:                       See 2.7.      (line  777)
Auto Flag, Menu Item:                          See 2.7.      (line  785)
Auto Flip View, Menu Item:                     See 2.7.      (line  795)
Auto Observe, Menu Item:                       See 2.7.      (line  800)
Auto Raise Board, Menu Item:                   See 2.7.      (line  813)
Auto Save, Menu Item:                          See 2.7.      (line  818)
autobs, option:                                See 3.3.      (line 1544)
autoCallFlag, option:                          See 3.3.      (line 1540)
autocomm, option:                              See 3.3.      (line 1536)
autoComment, option:                           See 3.3.      (line 1536)
autoflag, option:                              See 3.3.      (line 1540)
autoflip, option:                              See 3.5.      (line 1932)
autoFlipView, option:                          See 3.5.      (line 1932)
autoKibitz, option:                            See 3.3.      (line 1548)
autoObserve, option:                           See 3.3.      (line 1544)
autoraise, option:                             See 3.5.      (line 1928)
autoRaiseBoard, option:                        See 3.5.      (line 1928)
autoRefresh, option:                           See 3.3.      (line 1565)
autosave, option:                              See 3.4.      (line 1783)
autoSaveGames, option:                         See 3.4.      (line 1783)
Back to Start, Menu Item:                      See 2.2.      (line  381)
backgroundObserve, option:                     See 3.3.      (line 1571)
Backward, Menu Item:                           See 2.2.      (line  348)
bell, option:                                  See 3.5.      (line 1868)
bitmapDirectory, option:                       See 3.5.      (line 2023)
blackPieceColor, option:                       See 3.5.      (line 2070)
blind, option:                                 See 3.5.      (line 1990)
Blindfold, Menu Item:                          See 2.7.      (line  825)
blindfold, option:                             See 3.5.      (line 1990)
bm, option:                                    See 3.5.      (line 2023)
board size:                                    See 3.5.      (line 1889)
boardHeight, option:                           See 3.7.      (line 2251)
boardSize, option:                             See 3.5.      (line 1889)
boardWidth, option:                            See 3.7.      (line 2256)
Book, Menu Item:                               See 2.6.      (line  677)
Bug reports:                                   See 8.        (line 2628)
Bugs <1>:                                      See 8.        (line 2628)
Bugs:                                          See 7.        (line 2573)
buttons, option:                               See 3.5.      (line 1954)
Call Flag, Menu Item:                          See 2.5.      (line  602)
checkMates, option:                            See 3.6.      (line 2132)
Chess engine options:                          See 3.1.      (line 1113)
CHESSDIR:                                      See 6.        (line 2564)
clock, option:                                 See 3.1.      (line 1130)
clockFont, option:                             See 3.5.      (line 1994)
clockMode, option:                             See 3.1.      (line 1130)
cmail:                                         See 10.       (line 2698)
colorChallenge, option:                        See 3.3.      (line 1638)
colorChannel, option:                          See 3.3.      (line 1638)
colorChannel1, option:                         See 3.3.      (line 1638)
colorize, option:                              See 3.3.      (line 1624)
colorKibitz, option:                           See 3.3.      (line 1638)
colorNormal, option:                           See 3.3.      (line 1638)
colorRequest, option:                          See 3.3.      (line 1638)
Colors <1>:                                    See 3.5.      (line 2070)
Colors:                                        See 3.3.      (line 1624)
colorSeek, option:                             See 3.3.      (line 1638)
colorShout, option:                            See 3.3.      (line 1638)
colorSShout, option:                           See 3.3.      (line 1638)
colorTell, option:                             See 3.3.      (line 1638)
Comments, Menu Item:                           See 2.3.      (line  456)
Common Engine, Menu Item:                      See 2.7.      (line  712)
Contributors:                                  See 9.        (line 2646)
coordFont, option:                             See 3.5.      (line 2000)
coords, option:                                See 3.5.      (line 1924)
Copy Game, Menu Item:                          See 2.2.      (line  230)
Copy Position, Menu Item:                      See 2.2.      (line  239)
darkSquareColor, option:                       See 3.5.      (line 2070)
debug, option:                                 See 3.7.      (line 2302)
debugFile, option:                             See 3.7.      (line 2305)
debugMode, option:                             See 3.7.      (line 2302)
decline, ICS command:                          See 4.        (line 2401)
Decline, Menu Item:                            See 2.5.      (line  596)
defaultCacheSizeEGTB, option:                  See 3.2.      (line 1398)
defaultFrcPosition, option:                    See 3.7.      (line 2271)
defaultHashSize, option:                       See 3.2.      (line 1392)
defaultPathEGTB, option:                       See 3.2.      (line 1404)
delayAfterQuit, option:                        See 3.7.      (line 2337)
delayBeforeQuit, option:                       See 3.7.      (line 2337)
display, option:                               See 3.5.      (line 1859)
drag, option:                                  See 3.5.      (line 2092)
draw, ICS command:                             See 4.        (line 2414)
Draw, Menu Item:                               See 2.5.      (line  608)
dropMenu, option:                              See 3.3.      (line 1730)
dualBoard, option:                             See 3.3.      (line 1585)
Edit Comment, Menu Item:                       See 2.2.      (line  318)
Edit Game, Menu Item:                          See 2.2.      (line  258)
Edit Menu:                                     See 2.2.      (line  229)
Edit Position, Menu Item:                      See 2.2.      (line  274)
Edit Tags, Menu Item:                          See 2.2.      (line  294)
egtFormats, option:                            See 3.2.      (line 1408)
Engine #1 Settings, Menu Item:                 See 2.6.      (line  655)
Engine #2 Settings, Menu Item:                 See 2.6.      (line  655)
Engine Menu:                                   See 2.6.      (line  654)
Engine Settings:                               See 3.2.      (line 1360)
Engine Settings, Menu Item:                    See 2.6.      (line  655)
engineDebugOutput, option:                     See 3.7.      (line 2309)
Environment variables:                         See 6.        (line 2564)
examine, ICS command:                          See 4.        (line 2437)
Exit, Menu Item:                               See 2.1.      (line  224)
exit, option:                                  See 3.5.      (line 1873)
fb, option:                                    See 3.1.      (line 1237)
fcp, option:                                   See 3.1.      (line 1230)
fd, option:                                    See 3.1.      (line 1252)
fh, option:                                    See 3.1.      (line 1244)
File Menu:                                     See 2.1.      (line  114)
finger, ICS command:                           See 4.        (line 2424)
firstChessProgram, option:                     See 3.1.      (line 1230)
firstComputerString, option:                   See 3.1.      (line 1288)
firstDirectory, option:                        See 3.1.      (line 1252)
firstHasOwnBookUCI, option:                    See 3.2.      (line 1387)
firstHost, option:                             See 3.1.      (line 1244)
firstIsUCI, option:                            See 3.2.      (line 1362)
firstNeedsNoncompliantFEN, option:             See 3.1.      (line 1338)
firstNPS, option:                              See 3.1.      (line 1153)
firstOptions, option:                          See 3.1.      (line 1327)
firstPlaysBlack, option:                       See 3.1.      (line 1237)
firstProtocolVersion, option:                  See 3.1.      (line 1305)
firstScoreAbs, option:                         See 3.1.      (line 1313)
firstTimeOdds, option:                         See 3.1.      (line 1171)
firstXBook, option:                            See 3.2.      (line 1387)
Flash Moves, Menu Item:                        See 2.7.      (line  831)
flash, option:                                 See 3.5.      (line 1973)
flashCount, option:                            See 3.5.      (line 1973)
flashRate, option:                             See 3.5.      (line 1973)
Flip View, Menu Item:                          See 2.3.      (line  415)
flip, option:                                  See 3.5.      (line 1936)
flipView, option:                              See 3.5.      (line 1936)
fNoOwnBookUCI, option:                         See 3.2.      (line 1387)
Font:                                          See 3.5.      (line 2007)
Font, clock:                                   See 3.5.      (line 1994)
Font, coordinates:                             See 3.5.      (line 2000)
font, option:                                  See 3.5.      (line 2007)
fontSizeTolerance, option:                     See 3.5.      (line 2013)
Forward to End, Menu Item:                     See 2.2.      (line  400)
Forward, Menu Item:                            See 2.2.      (line  368)
fUCI, option:                                  See 3.2.      (line 1362)
Game List Tags, Menu Item:                     See 2.7.      (line  750)
gameListTags, option:                          See 3.4.      (line 1825)
games, ICS command:                            See 4.        (line 2390)
gateway, option:                               See 3.3.      (line 1467)
geometry, option:                              See 3.5.      (line 1859)
Get Move List, Menu Item:                      See 2.7.      (line  845)
getMoveList, option:                           See 3.3.      (line 1601)
Help Menu:                                     See 2.8.      (line 1004)
help, ICS command:                             See 4.        (line 2375)
Hide Thinking, Menu Item:                      See 2.7.      (line  959)
highlight Arrow, option:                       See 3.5.      (line 1986)
Highlight Dragging, Menu Item:                 See 2.7.      (line  857)
Highlight Last Move, Menu Item:                See 2.7.      (line  865)
Highlight with Arrow, Menu Item:               See 2.7.      (line  871)
highlight, option:                             See 3.5.      (line 1982)
highlightLastMove, option:                     See 3.5.      (line 1982)
highlightMoveWithArrow, option:                See 3.5.      (line 1986)
highlightSquareColor, option:                  See 3.5.      (line 2070)
Hint, Menu Item:                               See 2.6.      (line  674)
holdingsSize, option:                          See 3.7.      (line 2263)
iconic, option:                                See 3.5.      (line 1859)
ICS:                                           See 4.        (line 2346)
ICS Alarm, Menu Item:                          See 2.7.      (line  891)
ICS Client, Menu Item:                         See 2.4.      (line  539)
ICS Input Box, Menu Item:                      See 2.3.      (line  461)
ICS options:                                   See 3.3.      (line 1422)
ICS, addresses:                                See 4.        (line 2346)
ics, option:                                   See 3.3.      (line 1423)
icsAlarm, option:                              See 3.3.      (line 1605)
icsAlarmTime, option:                          See 3.3.      (line 1609)
icscomm, option:                               See 3.3.      (line 1475)
icshelper, option:                             See 3.3.      (line 1441)
icshost, option:                               See 3.3.      (line 1428)
icsinput, option:                              See 3.3.      (line 1532)
icslogon, option:                              See 3.3.      (line 1517)
icsport, option:                               See 3.3.      (line 1437)
inc, option:                                   See 3.1.      (line 1123)
Info XBoard, Menu Item:                        See 2.8.      (line 1005)
init, option:                                  See 3.4.      (line 1834)
initalMode, option:                            See 3.7.      (line 2184)
initString, option:                            See 3.1.      (line 1261)
Internet Chess Server:                         See 4.        (line 2346)
internetChessServerCommPort, option:           See 3.3.      (line 1475)
internetChessServerHelper, option:             See 3.3.      (line 1441)
internetChessServerHost, option:               See 3.3.      (line 1428)
internetChessServerInputBox, option:           See 3.3.      (line 1532)
internetChessServerLogonScript, option:        See 3.3.      (line 1517)
internetChessServerMode, option:               See 3.3.      (line 1423)
internetChessServerPort, option:               See 3.3.      (line 1437)
introduction:
          See ``Introduction''.                              (line    9)
Keys:                                          See 2.9.      (line 1024)
legal, option:                                 See 3.5.      (line 1885)
lgf, option:                                   See 3.4.      (line 1746)
lgi, option:                                   See 3.4.      (line 1746)
lightSquareColor, option:                      See 3.5.      (line 2070)
Limitations:                                   See 7.        (line 2573)
Load and Save options:                         See 3.4.      (line 1744)
Load Game, Menu Item:                          See 2.1.      (line  148)
Load Next Game, Menu Item:                     See 2.9.      (line 1034)
Load Next Position, Menu Item:                 See 2.1.      (line  190)
Load Position, Menu Item:                      See 2.1.      (line  181)
Load Previous Game, Menu Item:                 See 2.9.      (line 1038)
Load Previous Position, Menu Item:             See 2.1.      (line  194)
loadGameFile, option:                          See 3.4.      (line 1746)
loadGameIndex, option:                         See 3.4.      (line 1746)
loadPositionFile, option:                      See 3.4.      (line 1788)
loadPositionIndex, option:                     See 3.4.      (line 1788)
lowTimeWarning, option:                        See 3.3.      (line 1613)
lowTimeWarningColor, option:                   See 3.5.      (line 2070)
lpf, option:                                   See 3.4.      (line 1788)
lpi, option:                                   See 3.4.      (line 1788)
Machine Black, Menu Item:                      See 2.4.      (line  475)
Machine White, Menu Item:                      See 2.4.      (line  471)
Mail Move, Menu Item:                          See 2.1.      (line  221)
Major modes:                                   See 1.        (line   19)
Man XBoard, Menu Item:                         See 2.8.      (line 1012)
matchGames, option:                            See 3.1.      (line 1208)
matchMode, option:                             See 3.1.      (line 1220)
materialDraws, option:                         See 3.6.      (line 2144)
Menu, Action:                                  See 2.5.      (line  589)
Menu, Edit:                                    See 2.2.      (line  229)
Menu, Engine:                                  See 2.6.      (line  654)
Menu, File:                                    See 2.1.      (line  114)
Menu, Help:                                    See 2.8.      (line 1004)
Menu, Mode:                                    See 2.4.      (line  470)
Menu, Options:                                 See 2.7.      (line  701)
Menu, View:                                    See 2.3.      (line  414)
Menus:                                         See 2.        (line   57)
mg, option:                                    See 3.1.      (line 1208)
mm, option:                                    See 3.1.      (line 1220)
Mode Menu:                                     See 2.4.      (line  470)
mode, option:                                  See 3.7.      (line 2184)
mono, option:                                  See 3.5.      (line 1960)
monoMode, option:                              See 3.5.      (line 1960)
Move Now, Menu Item:                           See 2.6.      (line  687)
Move Sound, Menu Item:                         See 2.7.      (line  876)
moves, option:                                 See 3.3.      (line 1601)
movesound, option:                             See 3.5.      (line 1868)
movesPerSession, option:                       See 3.1.      (line 1119)
mps, option:                                   See 3.1.      (line 1119)
msLoginDelay, option:                          See 3.3.      (line 1526)
nameOfDebugFile, option:                       See 3.7.      (line 2305)
ncp, option:                                   See 3.7.      (line 2179)
New Game, Menu Item:                           See 2.1.      (line  115)
New Shuffle Game, Menu Item:                   See 2.1.      (line  124)
New variant, Menu Item:                        See 2.1.      (line  137)
niceEngines, option:                           See 3.1.      (line 1319)
noChessProgram, option:                        See 3.7.      (line 2179)
noGUI, option:                                 See 3.5.      (line 1862)
observe, ICS command:                          See 4.        (line 2433)
oldmoves, ICS command:                         See 4.        (line 2437)
oldsave, option:                               See 3.4.      (line 1821)
oldSaveStyle, option:                          See 3.4.      (line 1821)
One-Click Moving, Menu Item:                   See 2.7.      (line  900)
oneClickMove, option:                          See 3.3.      (line 1594)
Options:                                       See 3.        (line 1087)
Options Menu:                                  See 2.7.      (line  701)
Options, adjudication:                         See 3.6.      (line 2118)
options, Chess engine:                         See 3.1.      (line 1113)
Options, ICS:                                  See 3.3.      (line 1422)
Options, Load and Save:                        See 3.4.      (line 1744)
Options, miscellaneous:                        See 3.7.      (line 2178)
Options, User interface:                       See 3.5.      (line 1856)
Other programs:                                See 11.       (line 2896)
Paste Game, Menu Item:                         See 2.2.      (line  249)
Paste Position, Menu Item:                     See 2.2.      (line  253)
Pause, Menu Item:                              See 2.4.      (line  563)
Periodic Updates, Menu Item:                   See 2.7.      (line  911)
pgnEventHeader, option`:                       See 3.4.      (line 1813)
pgnExtendedInfo, option`:                      See 3.4.      (line 1808)
pieceToSquareTable, option:                    See 3.7.      (line 2276)
pixmap, option:                                See 3.5.      (line 2023)
pixmapDirectory, option:                       See 3.5.      (line 2023)
polyglotBook, option:                          See 3.2.      (line 1376)
polyglotDir, option:                           See 3.2.      (line 1369)
Ponder Next Move, Menu Item:                   See 2.7.      (line  917)
ponder, option:                                See 3.1.      (line 1199)
ponderNextMove, option:                        See 3.1.      (line 1199)
Popup Exit Message, Menu Item:                 See 2.7.      (line  923)
Popup Move Errors, Menu Item:                  See 2.7.      (line  929)
popup, option:                                 See 3.5.      (line 1877)
popupExitMessage, option:                      See 3.5.      (line 1873)
popupMoveErrors, option:                       See 3.5.      (line 1877)
pre, option:                                   See 3.3.      (line 1617)
Premove, Menu Item:                            See 2.7.      (line  938)
premove, option:                               See 3.3.      (line 1617)
Problems:                                      See 8.        (line 2628)
queen, option:                                 See 3.5.      (line 1881)
Quiet Play, Menu Item:                         See 2.7.      (line  949)
quiet, option:                                 See 3.3.      (line 1620)
quietPlay, option:                             See 3.3.      (line 1620)
Reload CMail Message, Menu Item:               See 2.1.      (line  221)
Reload Same Game, Menu Item:                   See 2.9.      (line 1043)
Reload Same Position, Menu Item:               See 2.9.      (line 1047)
remoteShell, option:                           See 3.7.      (line 2323)
remoteUser, option:                            See 3.7.      (line 2328)
Reporting bugs:                                See 8.        (line 2628)
Reporting problems:                            See 8.        (line 2628)
Resign, Menu Item:                             See 2.5.      (line  624)
Retract Move, Menu Item:                       See 2.6.      (line  691)
reuse, option:                                 See 3.1.      (line 1296)
reuse2, option:                                See 3.1.      (line 1296)
reuseFirst, option:                            See 3.1.      (line 1296)
reuseSecond, option:                           See 3.1.      (line 1296)
Revert, Menu Item:                             See 2.2.      (line  324)
ringBellAfterMoves, option:                    See 3.5.      (line 1868)
rsh, option:                                   See 3.7.      (line 2323)
ruleMoves, option:                             See 3.6.      (line 2162)
ruser, option:                                 See 3.7.      (line 2328)
sameColorGames, option:                        See 3.1.      (line 1224)
Save Game, Menu Item:                          See 2.1.      (line  199)
Save Position, Menu Item:                      See 2.1.      (line  211)
Save Settings Now, Menu Item:                  See 2.7.      (line  982)
Save Settings on Exit, Menu Item:              See 2.7.      (line  996)
saveGameFile, option:                          See 3.4.      (line 1778)
saveOutOfBookInfo, option`:                    See 3.4.      (line 1817)
savePositionFile, option:                      See 3.4.      (line 1803)
saveSettingsFile, option:                      See 3.4.      (line 1834)
scp, option:                                   See 3.1.      (line 1233)
sd, option:                                    See 3.1.      (line 1144)
searchDepth, option:                           See 3.1.      (line 1144)
searchTime, option:                            See 3.1.      (line 1137)
secondChessProgram, option:                    See 3.1.      (line 1233)
secondComputerString, option:                  See 3.1.      (line 1288)
secondDirectory, option:                       See 3.1.      (line 1252)
secondHasOwnBookUCI, option:                   See 3.2.      (line 1387)
secondHost, option:                            See 3.1.      (line 1244)
secondInitString, option:                      See 3.1.      (line 1261)
secondIsUCI, option:                           See 3.2.      (line 1362)
secondNeedsNoncompliantFEN, option:            See 3.1.      (line 1338)
secondNPS, option:                             See 3.1.      (line 1153)
secondOptions, option:                         See 3.1.      (line 1327)
secondProtocolVersion, option:                 See 3.1.      (line 1305)
secondScoreAbs, option:                        See 3.1.      (line 1313)
secondTimeOdds, option:                        See 3.1.      (line 1171)
secondXBook, option:                           See 3.2.      (line 1387)
seekGraph, option:                             See 3.3.      (line 1556)
set, ICS command:                              See 4.        (line 2430)
Settings, Engine:                              See 3.2.      (line 1360)
SettingsFile, option:                          See 3.4.      (line 1834)
sg, option:                                    See 3.3.      (line 1556)
sgf, option:                                   See 3.4.      (line 1778)
sh, option:                                    See 3.1.      (line 1244)
Shortcut keys:                                 See 2.9.      (line 1024)
Show Coords, Menu Item:                        See 2.7.      (line  955)
Show Engine Output, Menu Item:                 See 2.3.      (line  420)
Show Evaluation Graph, Menu Item:              See 2.3.      (line  441)
Show Game List, Menu Item:                     See 2.3.      (line  447)
Show Move History, Menu Item:                  See 2.3.      (line  435)
showButtonBar, option:                         See 3.5.      (line 1954)
showCoords, option:                            See 3.5.      (line 1924)
showTargetSquares, option:                     See 3.5.      (line 1965)
showThinking, option:                          See 3.1.      (line 1189)
shuffleOpenings, option:                       See 3.1.      (line 1352)
size, option:                                  See 3.5.      (line 1889)
sNoOwnBookUCI, option:                         See 3.2.      (line 1387)
soundChallenge, option:                        See 3.3.      (line 1683)
soundChannel, option:                          See 3.3.      (line 1683)
soundIcsAlarm, option:                         See 3.3.      (line 1691)
soundIcsDraw, option:                          See 3.3.      (line 1702)
soundIcsLoss, option:                          See 3.3.      (line 1698)
soundIcsUnfinished, option:                    See 3.3.      (line 1706)
soundIcsWin, option:                           See 3.3.      (line 1694)
soundKibitz, option:                           See 3.3.      (line 1683)
soundMove, option:                             See 3.3.      (line 1688)
soundProgram, option:                          See 3.3.      (line 1667)
soundRequest, option:                          See 3.3.      (line 1683)
Sounds:                                        See 3.3.      (line 1667)
soundSeek, option:                             See 3.3.      (line 1683)
soundShout, option:                            See 3.3.      (line 1683)
soundSShout, option:                           See 3.3.      (line 1683)
soundTell, option:                             See 3.3.      (line 1683)
spf, option:                                   See 3.4.      (line 1803)
st, option:                                    See 3.1.      (line 1137)
Stop Examining, Menu Item:                     See 2.5.      (line  633)
Stop Observing, Menu Item:                     See 2.5.      (line  628)
sUCI, option:                                  See 3.2.      (line 1362)
Tags, Menu Item:                               See 2.3.      (line  451)
tc, option:                                    See 3.1.      (line 1114)
td, option:                                    See 3.4.      (line 1772)
telnet, option:                                See 3.3.      (line 1449)
telnetProgram, option:                         See 3.3.      (line 1458)
Test Legality, Menu Item:                      See 2.7.      (line  969)
testClaims, option:                            See 3.6.      (line 2138)
testLegality, option:                          See 3.5.      (line 1885)
thinking, option:                              See 3.1.      (line 1189)
Time Control, Menu Item:                       See 2.7.      (line  702)
timeControl, option:                           See 3.1.      (line 1114)
timeDelay, option:                             See 3.4.      (line 1772)
timeIncrement, option:                         See 3.1.      (line 1123)
timeOddsMode, option:                          See 3.1.      (line 1177)
title, option:                                 See 3.5.      (line 1946)
titleInWindow, option:                         See 3.5.      (line 1946)
Training, Menu Item:                           See 2.4.      (line  529)
trivialDraws, option:                          See 3.6.      (line 2151)
Truncate Game, Menu Item:                      See 2.2.      (line  343)
Two Machines, Menu Item:                       See 2.4.      (line  479)
Upload to Examine, Menu Item:                  See 2.5.      (line  638)
usePolyglotBook, option:                       See 3.2.      (line 1373)
User interface options:                        See 3.5.      (line 1856)
userName, option:                              See 3.7.      (line 2332)
useTelnet, option:                             See 3.3.      (line 1449)
variant, option:                               See 3.7.      (line 2192)
variations, option:                            See 3.3.      (line 1736)
vars, ICS command:                             See 4.        (line 2427)
View Menu:                                     See 2.3.      (line  414)
whitePieceColor, option:                       See 3.5.      (line 2070)
who, ICS command:                              See 4.        (line 2383)
xflash, option:                                See 3.5.      (line 1973)
Table of Contents
*****************

Introduction
1 Major modes
2 Menus, buttons, and keys
  2.1 File Menu
  2.2 Edit Menu
  2.3 View Menu
  2.4 Mode Menu
  2.5 Action Menu
  2.6 Engine Menu
  2.7 Options Menu
  2.8 Help Menu
  2.9 Other Shortcut Keys
3 Options
  3.1 Chess Engine Options
  3.2 UCI + WB Engine Settings
  3.3 ICS options
  3.4 Load and Save options
  3.5 User interface options
  3.6 Adjudication Options
  3.7 Other options
4 Chess Servers
5 Firewalls
6 Environment variables
7 Limitations and known bugs
8 Reporting problems
9 Authors and contributors
10 CMail
  10.1 CMail options
  10.2 Starting a CMail Game
  10.3 Answering a Move
  10.4 Multi-Game Messages
  10.5 Completing a Game
  10.6 Known CMail Problems
11 Other programs you can use with XBoard
  11.1 GNU Chess
  11.2 Fairy-Max
  11.3 HoiChess
  11.4 Crafty
  11.5 zic2xpm
Copyright
GNU GENERAL PUBLIC LICENSE
Index