<p><a name="index-options_002c-Chess-engine-113"></a><a name="index-Chess-engine-options-114"></a>
<dl>
-<dt>-tc or -timeControl minutes[:seconds]<dd><a name="index-tc_002c-option-115"></a><a name="index-timeControl_002c-option-116"></a>Each player begins with his clock set to the <code>timeControl</code> period.\r
-Default: 5 minutes.\r
-The additional options <code>movesPerSession</code> and <code>timeIncrement</code>\r
-are mutually exclusive. \r
-<br><dt>-mps or -movesPerSession moves<dd><a name="index-mps_002c-option-117"></a><a name="index-movesPerSession_002c-option-118"></a>When both players have made <code>movesPerSession</code> moves, a\r
-new <code>timeControl</code> period is added to both clocks. Default: 40 moves.\r
-<br><dt>-inc or -timeIncrement seconds<dd><a name="index-inc_002c-option-119"></a><a name="index-timeIncrement_002c-option-120"></a>If this option is specified, <code>movesPerSession</code> is ignored.\r
-Instead, after each player's move, <code>timeIncrement</code> seconds are\r
-added to his clock. \r
-Use ‘<samp><span class="samp">-inc 0</span></samp>’ if you want to require the entire\r
-game to be played in one <code>timeControl</code> period, with no increment.\r
-Default: -1, which specifies <code>movesPerSession</code> mode.\r
-<br><dt>-clock/-xclock or -clockMode true/false<dd><a name="index-clock_002c-option-121"></a><a name="index-clockMode_002c-option-122"></a>Determines whether or not to display the chess clocks. If clockMode is\r
-false, the clocks are not shown, but the side that is to play next\r
-is still highlighted. Also, unless <code>searchTime</code>\r
-is set, the chess engine still keeps track of the clock time and uses it to\r
-determine how fast to make its moves.\r
-<br><dt>-st or -searchTime minutes[:seconds]<dd><a name="index-st_002c-option-123"></a><a name="index-searchTime_002c-option-124"></a>Tells the chess engine to spend at most the given amount of time\r
-searching for each of its moves. Without this option, the chess engine\r
-chooses its search time based on the number of moves and amount\r
-of time remaining until the next time control.\r
-Setting this option also sets clockMode to false.\r
-<br><dt>-depth or -searchDepth number<dd><a name="index-sd_002c-option-125"></a><a name="index-searchDepth_002c-option-126"></a>Tells the chess engine to look ahead at most the given number of moves\r
-when searching for a move to make. Without this option, the chess\r
-engine chooses its search depth based on the number of moves and\r
-amount of time remaining until the next time control. With the option,\r
-the engine will cut off its search early if it reaches the specified depth.\r
-<br><dt>-firstNPS number<dt>-secondNPS number<dd><a name="index-firstNPS_002c-option-127"></a><a name="index-secondNPS_002c-option-128"></a>Tells the chess engine to use an internal time standard based on its node count, \r
-rather then wall-clock time, to make its timing decisions. \r
-The time in virtual seconds should be obtained by dividing the node count \r
-through the given number, like the number was a rate in nodes per second. \r
-Xboard will manage the clocks in accordance with this, relying on the number \r
-of nodes reported by the engine in its thinking output. If the given number equals zero, \r
-it can obviously not be used to convert nodes to seconds, and the time reported \r
-by the engine is used to decrement the XBoard clock in stead. The engine is supposed to \r
-report in CPU time it uses, rather than wall-clock time, in this mode. This option \r
-can provide fairer conditions for engine-engine matches on heavily loaded machines, \r
-or with very fast games (where the wall clock is too inaccurate). \r
-<code>showThinking</code> must be on for this option to work. Default: -1 (off).\r
-Not many engines might support this yet!\r
-<br><dt>-firstTimeOdds factor<dt>-secondTimeOdds factor<dd><a name="index-firstTimeOdds_002c-option-129"></a><a name="index-secondTimeOdds_002c-option-130"></a>Reduces the time given to the mentioned engine by the given factor. \r
-If pondering is off, the effect is indistinguishable from what would happen \r
-if the engine was running on an n-times slower machine. Default: 1.\r
-<br><dt>-timeOddsMode mode<dd><a name="index-timeOddsMode_002c-option-131"></a>This option determines how the case is handled where both engines have a time-odds handicap. \r
-If mode=1, the engine that gets the most time will always get the nominal time, \r
-as specified by the time-control options, and its opponent's time is renormalized accordingly. \r
-If mode=0, both play with reduced time. Default: 0.\r
-<br><dt>-hideThinkingFromHuman true/false<dd>Controls the Hide Thinking option. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: true.\r
-(Relaces the Show-Thinking option of older xboard versions.)\r
-<br><dt>-thinking/-xthinking or -showThinking true/false<dd><a name="index-thinking_002c-option-132"></a><a name="index-showThinking_002c-option-133"></a>Forces the engine to send thinking output to xboard. \r
-Used to be the only way to control if thinking output was displayed \r
-in older xboard versions,\r
-but as the thinking output in xboard 4.3 is also used for several other\r
-purposes (adjudication, storing in PGN file) the display of it is now controlled\r
-by the new option Hide Thinking. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: false.\r
-(But if xboard needs the thinking output for some purpose,\r
-it makes the engine send it despite the setting of this option.)\r
-<br><dt>-ponder/-xponder or -ponderNextMove true/false<dd><a name="index-ponder_002c-option-134"></a><a name="index-ponderNextMove_002c-option-135"></a>Sets the Ponder Next Move menu option. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: true.\r
-<br><dt>-smpCores number<dd>Specifies the maxmum nmber of CPUs an SMP engine is allowed to use.\r
-Only works for engines that support the WinBoard-protocol cores feature.\r
-<br><dt>-mg or -matchGames n<dd><a name="index-mg_002c-option-136"></a><a name="index-matchGames_002c-option-137"></a>Automatically runs an n-game match between two chess engines,\r
-with alternating colors.\r
-If the <code>loadGameFile</code> or <code>loadPositionFile</code> option is set,\r
-XBoard\r
-starts each game with the given opening moves or the given position;\r
-otherwise, the games start with the standard initial chess position.\r
-If the <code>saveGameFile</code> option is set, a move record for the\r
-match is appended to the specified file. If the <code>savePositionFile</code>\r
-option is set, the final position reached in each game of the match is appended\r
-to the specified file. When the match is over, XBoard\r
-displays the match score and exits. Default: 0 (do not run a match).\r
-<br><dt>-mm/-xmm or -matchMode true/false<dd><a name="index-mm_002c-option-138"></a><a name="index-matchMode_002c-option-139"></a>Setting <code>matchMode</code> to true is equivalent to setting\r
-<code>matchGames</code> to 1.\r
-<br><dt>-sameColorGames n<dd><a name="index-sameColorGames_002c-option-140"></a>Automatically runs an n-game match between two chess engines,\r
-without alternating colors.\r
-Otherwise the same applies as for the ‘<samp><span class="samp">-matchGames</span></samp>’ option,\r
-over which it takes precedence if both are specified. (See there.)\r
-Default: 0 (do not run a match).\r
-<br><dt>-fcp or -firstChessProgram program<dd><a name="index-fcp_002c-option-141"></a><a name="index-firstChessProgram_002c-option-142"></a>Name of first chess engine.\r
-Default: <samp><span class="file">Fairy-Max</span></samp>.\r
-<br><dt>-scp or -secondChessProgram program<dd><a name="index-scp_002c-option-143"></a><a name="index-secondChessProgram_002c-option-144"></a>Name of second chess engine, if needed.\r
-A second chess engine is started only in Two Machines (match) mode.\r
-Default: <samp><span class="file">Fairy-Max</span></samp>.\r
-<br><dt>-fb/-xfb or -firstPlaysBlack true/false<dd><a name="index-fb_002c-option-145"></a><a name="index-firstPlaysBlack_002c-option-146"></a>In games between two chess engines, firstChessProgram normally plays\r
-white. If this option is true, firstChessProgram plays black. In a\r
-multi-game match, this option affects the colors only for the first\r
-game; they still alternate in subsequent games.\r
-<br><dt>-fh or -firstHost host<dt>-sh or -secondHost host<dd><a name="index-fh_002c-option-147"></a><a name="index-firstHost_002c-option-148"></a><a name="index-sh_002c-option-149"></a><a name="index-secondHost_002c-option-150"></a>Hosts on which the chess engines are to run. The default for\r
-each is <samp><span class="file">localhost</span></samp>. If you specify another host, XBoard\r
-uses <samp><span class="file">rsh</span></samp> to run the chess engine there. (You can substitute a\r
-different remote shell program for rsh using the <code>remoteShell</code>\r
-option described below.)\r
-<br><dt>-fd or -firstDirectory dir<dt>-sd or -secondDirectory dir<dd><a name="index-fd_002c-option-151"></a><a name="index-firstDirectory_002c-option-152"></a><a name="index-sd_002c-option-153"></a><a name="index-secondDirectory_002c-option-154"></a>Working directories in which the chess engines are to be run.\r
-The default is "", which means to run the chess engine\r
-in the same working directory as XBoard\r
-itself. (See the CHESSDIR environment variable.)\r
-This option is effective only when the chess engine is being run\r
-on the local host; it does not work if the engine is run remotely\r
-using the -fh or -sh option.\r
-<br><dt>-initString string<dt>-secondInitString string<dd><a name="index-initString_002c-option-155"></a><a name="index-secondInitString_002c-option-156"></a>The string that is sent to initialize each chess engine for a new game.\r
-Default:\r
-\r
- <pre class="example"> new\r
- random\r
+<dt>-tc or -timeControl minutes[:seconds]<dd><a name="index-tc_002c-option-115"></a><a name="index-timeControl_002c-option-116"></a>Each player begins with his clock set to the <code>timeControl</code> period.
+Default: 5 minutes.
+The additional options <code>movesPerSession</code> and <code>timeIncrement</code>
+are mutually exclusive.
+<br><dt>-mps or -movesPerSession moves<dd><a name="index-mps_002c-option-117"></a><a name="index-movesPerSession_002c-option-118"></a>When both players have made <code>movesPerSession</code> moves, a
+new <code>timeControl</code> period is added to both clocks. Default: 40 moves.
+<br><dt>-inc or -timeIncrement seconds<dd><a name="index-inc_002c-option-119"></a><a name="index-timeIncrement_002c-option-120"></a>If this option is specified, <code>movesPerSession</code> is ignored.
+Instead, after each player's move, <code>timeIncrement</code> seconds are
+added to his clock.
+Use ‘<samp><span class="samp">-inc 0</span></samp>’ if you want to require the entire
+game to be played in one <code>timeControl</code> period, with no increment.
+Default: -1, which specifies <code>movesPerSession</code> mode.
+<br><dt>-clock/-xclock or -clockMode true/false<dd><a name="index-clock_002c-option-121"></a><a name="index-clockMode_002c-option-122"></a>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 <code>searchTime</code>
+is set, the chess engine still keeps track of the clock time and uses it to
+determine how fast to make its moves.
+<br><dt>-st or -searchTime minutes[:seconds]<dd><a name="index-st_002c-option-123"></a><a name="index-searchTime_002c-option-124"></a>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.
+<br><dt>-depth or -searchDepth number<dd><a name="index-sd_002c-option-125"></a><a name="index-searchDepth_002c-option-126"></a>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.
+<br><dt>-firstNPS number<dt>-secondNPS number<dd><a name="index-firstNPS_002c-option-127"></a><a name="index-secondNPS_002c-option-128"></a>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).
+<code>showThinking</code> must be on for this option to work. Default: -1 (off).
+Not many engines might support this yet!
+<br><dt>-firstTimeOdds factor<dt>-secondTimeOdds factor<dd><a name="index-firstTimeOdds_002c-option-129"></a><a name="index-secondTimeOdds_002c-option-130"></a>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.
+<br><dt>-timeOddsMode mode<dd><a name="index-timeOddsMode_002c-option-131"></a>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.
+<br><dt>-hideThinkingFromHuman true/false<dd>Controls the Hide Thinking option. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: true.
+(Relaces the Show-Thinking option of older xboard versions.)
+<br><dt>-thinking/-xthinking or -showThinking true/false<dd><a name="index-thinking_002c-option-132"></a><a name="index-showThinking_002c-option-133"></a>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. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: false.
+(But if xboard needs the thinking output for some purpose,
+it makes the engine send it despite the setting of this option.)
+<br><dt>-ponder/-xponder or -ponderNextMove true/false<dd><a name="index-ponder_002c-option-134"></a><a name="index-ponderNextMove_002c-option-135"></a>Sets the Ponder Next Move menu option. See <a href="Options-Menu.html#Options-Menu">Options Menu</a>. Default: true.
+<br><dt>-smpCores number<dd>Specifies the maxmum nmber of CPUs an SMP engine is allowed to use.
+Only works for engines that support the WinBoard-protocol cores feature.
+<br><dt>-mg or -matchGames n<dd><a name="index-mg_002c-option-136"></a><a name="index-matchGames_002c-option-137"></a>Automatically runs an n-game match between two chess engines,
+with alternating colors.
+If the <code>loadGameFile</code> or <code>loadPositionFile</code> 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 <code>saveGameFile</code> option is set, a move record for the
+match is appended to the specified file. If the <code>savePositionFile</code>
+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).
+<br><dt>-mm/-xmm or -matchMode true/false<dd><a name="index-mm_002c-option-138"></a><a name="index-matchMode_002c-option-139"></a>Setting <code>matchMode</code> to true is equivalent to setting
+<code>matchGames</code> to 1.
+<br><dt>-sameColorGames n<dd><a name="index-sameColorGames_002c-option-140"></a>Automatically runs an n-game match between two chess engines,
+without alternating colors.
+Otherwise the same applies as for the ‘<samp><span class="samp">-matchGames</span></samp>’ option,
+over which it takes precedence if both are specified. (See there.)
+Default: 0 (do not run a match).
+<br><dt>-fcp or -firstChessProgram program<dd><a name="index-fcp_002c-option-141"></a><a name="index-firstChessProgram_002c-option-142"></a>Name of first chess engine.
+Default: <samp><span class="file">Fairy-Max</span></samp>.
+<br><dt>-scp or -secondChessProgram program<dd><a name="index-scp_002c-option-143"></a><a name="index-secondChessProgram_002c-option-144"></a>Name of second chess engine, if needed.
+A second chess engine is started only in Two Machines (match) mode.
+Default: <samp><span class="file">Fairy-Max</span></samp>.
+<br><dt>-fb/-xfb or -firstPlaysBlack true/false<dd><a name="index-fb_002c-option-145"></a><a name="index-firstPlaysBlack_002c-option-146"></a>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.
+<br><dt>-fh or -firstHost host<dt>-sh or -secondHost host<dd><a name="index-fh_002c-option-147"></a><a name="index-firstHost_002c-option-148"></a><a name="index-sh_002c-option-149"></a><a name="index-secondHost_002c-option-150"></a>Hosts on which the chess engines are to run. The default for
+each is <samp><span class="file">localhost</span></samp>. If you specify another host, XBoard
+uses <samp><span class="file">rsh</span></samp> to run the chess engine there. (You can substitute a
+different remote shell program for rsh using the <code>remoteShell</code>
+option described below.)
+<br><dt>-fd or -firstDirectory dir<dt>-sd or -secondDirectory dir<dd><a name="index-fd_002c-option-151"></a><a name="index-firstDirectory_002c-option-152"></a><a name="index-sd_002c-option-153"></a><a name="index-secondDirectory_002c-option-154"></a>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.
+<br><dt>-initString string<dt>-secondInitString string<dd><a name="index-initString_002c-option-155"></a><a name="index-secondInitString_002c-option-156"></a>The string that is sent to initialize each chess engine for a new game.
+Default:
+
+ <pre class="example"> new
+ random
</pre>
- <p class="noindent">Setting this option from the command line is tricky, because you must\r
-type in real newline characters, including one at the very end.\r
-In most shells you can do this by\r
-entering a ‘<samp><span class="samp">\</span></samp>’ character followed by a newline. It is easier to set\r
-the option from your <samp><span class="file">.Xresources</span></samp> file; in that case you can\r
-include the character sequence ‘<samp><span class="samp">\n</span></samp>’ in the string, and it will\r
-be converted to a newline.\r
-\r
-If you change this option, don't remove the ‘<samp><span class="samp">new</span></samp>’ \r
-command; it is required by all chess engines to\r
-start a new game.\r
-\r
-You can remove the ‘<samp><span class="samp">random</span></samp>’ command if you like; including it\r
-causes GNU Chess 4 to randomize its move selection slightly so that it\r
-doesn't play the same moves in every game. Even without\r
-‘<samp><span class="samp">random</span></samp>’, GNU Chess 4 randomizes its choice of moves from its\r
-opening book. Many other chess engines ignore this command entirely\r
-and always (or never) randomize.\r
-\r
-You can also try adding other commands to the initString; see the\r
-documentation of the chess engine you are using for details.\r
-<br><dt>-firstComputerString string<dt>-secondComputerString string<dd><a name="index-firstComputerString_002c-option-157"></a><a name="index-secondComputerString_002c-option-158"></a>The string that is sent to the chess engine if its opponent is another\r
-computer chess engine. The default is ‘<samp><span class="samp">computer\n</span></samp>’. Probably the\r
-only useful alternative is the empty string (‘<samp></samp>’), which keeps the\r
-engine from knowing that it is playing another computer.\r
-<br><dt>-reuse/-xreuse or -reuseFirst true/false<dt>-reuse2/-xreuse2 or -reuseSecond true/false<dd><a name="index-reuse_002c-option-159"></a><a name="index-reuseFirst_002c-option-160"></a><a name="index-reuse2_002c-option-161"></a><a name="index-reuseSecond_002c-option-162"></a>If the option is false,\r
-XBoard kills off the chess engine after every game and starts\r
-it again for the next game. \r
-If the option is true (the default), \r
-XBoard starts the chess engine only once\r
-and uses it repeatedly to play multiple games.\r
-Some old chess engines may not work properly when\r
-reuse is turned on, but otherwise games will start faster if it is left on.\r
-<br><dt>-firstProtocolVersion version-number<dt>-secondProtocolVersion version-number<dd><a name="index-firstProtocolVersion_002c-option-163"></a><a name="index-secondProtocolVersion_002c-option-164"></a>This option specifies which version of the chess engine communication\r
-protocol to use. By default, version-number is 2. In version 1, the\r
-"protover" command is not sent to the engine; since version 1 is a\r
-subset of version 2, nothing else changes. Other values for\r
-version-number are not supported.\r
-<br><dt>-firstScoreAbs true/false<dt>-secondScoreAbs true/false<dd><a name="index-firstScoreAbs_002c-option-165"></a><a name="index-secondScoreAbs_002c-option-166"></a>If this option is set, the score reported by the engine is taken to be \r
-that in favor of white, even when the engine plays black. \r
-Important when XBoard uses the score for adjudications, or in PGN reporting. \r
-<br><dt>-niceEngines priority<dd><a name="index-niceEngines_002c-option-167"></a>This option allows you to lower the priority of the engine processes, \r
-so that the generally insatiable hunger for CPU time of chess engines does not interfere so much \r
-with smooth operation of WinBoard (or the rest of your system). \r
-Negative values could increase the engine priority, which is not recommended.\r
-<br><dt>-firstOptions string<dt>-secondOptions string<dd><a name="index-firstOptions_002c-option-168"></a><a name="index-secondOptions_002c-option-169"></a>The given string is a comma-separated list of (option name, option value) pairs, \r
-like the following example: style=Karpov,blunder rate=0. \r
-If the options announced by the engine at startup through the feature commands of WinBoard protocol \r
-matches one of the option names (i.e. style or blunder rate), \r
-it would be set to the given value (i.e. Karpov or 0) \r
-through a corresponding option command to the engine. \r
-This provided that the type of the value (text or numeric) matches as well.\r
-<br><dt>-firstNeedsNoncompliantFEN string<dt>-secondNeedsNoncompliantFEN string<dd><a name="index-firstNeedsNoncompliantFEN_002c-option-170"></a><a name="index-secondNeedsNoncompliantFEN_002c-option-171"></a>The castling rights and e.p. fields of the FEN sent to the mentioned engine \r
-with the setboard command will be replaced by the given string. This can for \r
-instance be used to run engines that do not understand Chess960 FENs in \r
-variant fischerandom, to make them at least understand the opening position, \r
-through setting the string to KQkq -. (Note you also have to give the e.p. field!) \r
-Other possible applications are to provide work-arounds for engines that want to see \r
-castling and e.p. fields in variants that do not have castling or e.p. \r
-(shatranj, courier, xiangqi, shogi) so that WinBoard would normally omit them \r
-(string = - -), or to add variant-specific fields that are not yet supported by WinBoard \r
-(e.g. to indicate the number of checks in 3check).\r
+ <p class="noindent">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 ‘<samp><span class="samp">\</span></samp>’ character followed by a newline. It is easier to set
+the option from your <samp><span class="file">.Xresources</span></samp> file; in that case you can
+include the character sequence ‘<samp><span class="samp">\n</span></samp>’ in the string, and it will
+be converted to a newline.
+
+ <p>If you change this option, don't remove the ‘<samp><span class="samp">new</span></samp>’
+command; it is required by all chess engines to
+start a new game.
+
+ <p>You can remove the ‘<samp><span class="samp">random</span></samp>’ 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
+‘<samp><span class="samp">random</span></samp>’, 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.
+
+ <p>You can also try adding other commands to the initString; see the
+documentation of the chess engine you are using for details.
+<br><dt>-firstComputerString string<dt>-secondComputerString string<dd><a name="index-firstComputerString_002c-option-157"></a><a name="index-secondComputerString_002c-option-158"></a>The string that is sent to the chess engine if its opponent is another
+computer chess engine. The default is ‘<samp><span class="samp">computer\n</span></samp>’. Probably the
+only useful alternative is the empty string (‘<samp></samp>’), which keeps the
+engine from knowing that it is playing another computer.
+<br><dt>-reuse/-xreuse or -reuseFirst true/false<dt>-reuse2/-xreuse2 or -reuseSecond true/false<dd><a name="index-reuse_002c-option-159"></a><a name="index-reuseFirst_002c-option-160"></a><a name="index-reuse2_002c-option-161"></a><a name="index-reuseSecond_002c-option-162"></a>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.
+<br><dt>-firstProtocolVersion version-number<dt>-secondProtocolVersion version-number<dd><a name="index-firstProtocolVersion_002c-option-163"></a><a name="index-secondProtocolVersion_002c-option-164"></a>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.
+<br><dt>-firstScoreAbs true/false<dt>-secondScoreAbs true/false<dd><a name="index-firstScoreAbs_002c-option-165"></a><a name="index-secondScoreAbs_002c-option-166"></a>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.
+<br><dt>-niceEngines priority<dd><a name="index-niceEngines_002c-option-167"></a>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 WinBoard (or the rest of your system).
+Negative values could increase the engine priority, which is not recommended.
+<br><dt>-firstOptions string<dt>-secondOptions string<dd><a name="index-firstOptions_002c-option-168"></a><a name="index-secondOptions_002c-option-169"></a>The given string is a comma-separated list of (option name=option value) pairs,
+like the following example: "style=Karpov,blunder rate=0".
+If the options announced by the engine at startup through the feature commands of 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.
+<br><dt>-firstNeedsNoncompliantFEN string<dt>-secondNeedsNoncompliantFEN string<dd><a name="index-firstNeedsNoncompliantFEN_002c-option-170"></a><a name="index-secondNeedsNoncompliantFEN_002c-option-171"></a>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 WinBoard would normally omit them
+(string = "- -"), or to add variant-specific fields that are not yet supported by WinBoard
+(e.g. to indicate the number of checks in 3check).
</dl>
- \r
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projects / xboard.git / blobdiff