-<html>
-<header>
-<title>Seirawan Chess</title>
-<link rel=StyleSheet href="./moves.css" type="text/css">
-<script type="text/javascript" src="spartan.js"></script>
-</header>
-<body>
-<h1>Seirawan Chess (S-Chess)</h1>
-<table cellpadding="20"><tr><td>
-<img src="Seirawan.png">
-<p><i>Pieces available for gating will be displayed beside the board</i></p>
-</td><td>
-<h3>Initial setup</h3>
-<p>
-e1, e8: King
-<br>
-d1, d8: Queen
-<br>
-a1, a8, h1, h8: Rook
-<br>
-c1, c8, f1, f8: Bishop
-<br>
-b1, b8, g1, g8: Knight
-<br>
-a2-h2, a7-h7: Pawns
-<br>
-<b>In each hand</b>
-<br>
-1 Elephant
-<br>
-1 Hawk
-</p>
+<!--#include virtual="/server/html5-header.html" -->
+ <title>Seirawan Chess</title>
+ <link rel="StyleSheet" href="./moves.css" type="text/css">
+ <script type="text/javascript" src="spartan.js">
+</script>
+<!--#include virtual="/server/banner.html" -->
+<!--#set var="article_name" value="/server/standards/boilerplate" -->
+<!--#include virtual="/server/gnun/initial-translations-list.html" -->
-</td></tr></table>
+ <h1>Seirawan Chess (S-Chess)</h1>
-<h3>Moves at a Glance</h3>
+ <table cellpadding="20">
+ <tr>
+ <td>
+ <img src="Seirawan.png">
-<p>Click on a piece below to see its moves</p>
+ <p><i>Pieces available for gating will be displayed beside
+ the board</i></p>
+ </td>
-<table class="board"><tr><td class="h" id="0x9">
+ <td>
+ <h3>Initial setup</h3>
- </td><td class="n" id="1x9" onmouseDown="down_click(1,-9)" onmouseUp="up_click()">
-<img src="sym/BlackRook.png">
- </td><td class="n" id="2x9">
+ <p>e1, e8: King<br>
+ d1, d8: Queen<br>
+ a1, a8, h1, h8: Rook<br>
+ c1, c8, f1, f8: Bishop<br>
+ b1, b8, g1, g8: Knight<br>
+ a2-h2, a7-h7: Pawns<br>
+ <b>In each hand</b><br>
+ 1 Elephant<br>
+ 1 Hawk</p>
+ </td>
+ </tr>
+ </table>
- </td><td class="n" id="3x9">
+ <h3>Moves at a Glance</h3>
- </td><td class="n" id="4x9">
+ <p>Click on a piece below to see its moves</p>
- </td><td class="n" id="5x9" onmouseDown="down_click(5,9)" onmouseUp="up_click()">
-<img src="sym/BlackKing.png">
- </td><td class="n" id="6x9">
+ <table class="board">
+ <tr>
+ <td class="h" id="sq0x9"></td>
- </td><td class="n" id="7x9">
+ <td class="n" id="sq1x9" onmousedown="down_click(1,-9)"
+ onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
- </td><td class="n" id="8x9" onmouseDown="down_click(8,9)" onmouseUp="up_click()">
-<img src="sym/BlackRook.png">
- </td><td class="h" id="9x9">
+ <td class="n" id="sq2x9"></td>
- </td><td class="h">
-<img src="sym/yellow.png">
- </td><td class="w" rowspan="2" valign="top">
-<p>Sliding capture or non-capture,<br>can be blocked on any square along the ray</p>
-</td></tr><tr><td class="h" id="0x8">
+ <td class="n" id="sq3x9"></td>
- </td><td class="n" id="1x8">
+ <td class="n" id="sq4x9"></td>
- </td><td class="n" id="2x8" onmouseDown="down_click(2,0)" onmouseUp="up_click()">
+ <td class="n" id="sq5x9" onmousedown="down_click(5,9)"
+ onmouseup="up_click()"><img src="sym/BlackKing.png"></td>
- </td><td class="n" id="3x8">
+ <td class="n" id="sq6x9"></td>
- </td><td class="n" id="4x8">
+ <td class="n" id="sq7x9"></td>
- </td><td class="n" id="5x8">
+ <td class="n" id="sq8x9" onmousedown="down_click(8,9)"
+ onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
- </td><td class="n" id="6x8">
+ <td class="h" id="sq9x9"></td>
- </td><td class="n" id="7x8">
+ <td class="h"><img src="sym/yellow.png"></td>
- </td><td class="n" id="8x8">
+ <td class="w" rowspan="2" valign="top">
+ <p>Sliding capture or non-capture,<br>
+ can be blocked on any square along the ray</p>
+ </td>
+ </tr>
- </td><td class="h" id="9x8">
+ <tr>
+ <td class="h" id="sq0x8"></td>
-</td></tr><tr><td class="h" id="0x7">
+ <td class="n" id="sq1x8"></td>
- </td><td class="n" id="1x7">
+ <td class="n" id="sq2x8" onmousedown="down_click(2,0)"
+ onmouseup="up_click()"></td>
- </td><td class="n" id="2x7">
+ <td class="n" id="sq3x8"></td>
- </td><td class="n" id="3x7">
+ <td class="n" id="sq4x8"></td>
- </td><td class="n" id="4x7">
+ <td class="n" id="sq5x8"></td>
- </td><td class="n" id="5x7">
+ <td class="n" id="sq6x8"></td>
- </td><td class="n" id="6x7">
+ <td class="n" id="sq7x8"></td>
- </td><td class="n" id="7x7">
+ <td class="n" id="sq8x8"></td>
- </td><td class="n" id="8x7">
+ <td class="h" id="sq9x8"></td>
+ </tr>
- </td><td class="h" id="9x7">
+ <tr>
+ <td class="h" id="sq0x7"></td>
- </td><td class="h">
-<img src="sym/orange.png">
- </td><td class="w">
-Unblockable leap (capture or non-capture)
-</td></tr><tr><td class="h" id="0x6">
+ <td class="n" id="sq1x7"></td>
- </td><td class="n" id="1x6">
+ <td class="n" id="sq2x7"></td>
- </td><td class="n" id="2x6">
+ <td class="n" id="sq3x7"></td>
- </td><td class="n" id="3x6">
+ <td class="n" id="sq4x7"></td>
- </td><td class="n" id="4x6">
+ <td class="n" id="sq5x7"></td>
- </td><td class="n" id="5x6" onmouseDown="down_click(5,10)" onmouseUp="up_click()">
-<img src="sym/WhiteHawk.png">
- </td><td class="n" id="6x6">
+ <td class="n" id="sq6x7"></td>
- </td><td class="n" id="7x6">
+ <td class="n" id="sq7x7"></td>
- </td><td class="n" id="8x6">
+ <td class="n" id="sq8x7"></td>
- </td><td class="h" id="9x6">
+ <td class="h" id="sq9x7"></td>
- </td><td class="h">
-<img src="sym/green.png">
- </td><td class="w">
-Non-capture only
-</td></tr><tr><td class="h" id="0x5">
+ <td class="h"><img src="sym/orange.png"></td>
- </td><td class="n" id="1x5">
+ <td class="w">Unblockable leap (capture or non-capture)</td>
+ </tr>
- </td><td class="n" id="2x5">
+ <tr>
+ <td class="h" id="sq0x6"></td>
- </td><td class="n" id="3x5">
+ <td class="n" id="sq1x6"></td>
- </td><td class="n" id="4x5">
+ <td class="n" id="sq2x6"></td>
- </td><td class="n" id="5x5">
+ <td class="n" id="sq3x6"></td>
- </td><td class="n" id="6x5">
+ <td class="n" id="sq4x6"></td>
- </td><td class="n" id="7x5">
+ <td class="n" id="sq5x6" onmousedown="down_click(5,10)"
+ onmouseup="up_click()"><img src="sym/WhiteHawk.png"></td>
- </td><td class="n" id="8x5">
+ <td class="n" id="sq6x6"></td>
- </td><td class="h" id="9x5">
+ <td class="n" id="sq7x6"></td>
- </td><td class="h">
-<img src="sym/red.png">
- </td><td class="w">
-Capture only
-</td></tr><tr><td class="h" id="0x4">
+ <td class="n" id="sq8x6"></td>
- </td><td class="n" id="1x4">
+ <td class="h" id="sq9x6"></td>
- </td><td class="n" id="2x4">
+ <td class="h"><img src="sym/green.png"></td>
- </td><td class="n" id="3x4">
+ <td class="w">Non-capture only</td>
+ </tr>
- </td><td class="n" id="4x4">
+ <tr>
+ <td class="h" id="sq0x5"></td>
- </td><td class="n" id="5x4" onmouseDown="down_click(-5,4)" onmouseUp="up_click()">
-<img src="sym/WhiteElephant.png">
- </td><td class="n" id="6x4">
+ <td class="n" id="sq1x5"></td>
- </td><td class="n" id="7x4">
+ <td class="n" id="sq2x5"></td>
- </td><td class="n" id="8x4">
+ <td class="n" id="sq3x5"></td>
- </td><td class="h" id="9x4">
+ <td class="n" id="sq4x5"></td>
-</td></tr><tr><td class="h" id="0x3">
+ <td class="n" id="sq5x5"></td>
- </td><td class="n" id="1x3" onmouseDown="down_click(1,3)" onmouseUp="up_click()">
-<img src="sym/BlackPawn.png">
- </td><td class="n" id="2x3" onmouseDown="down_click(2,3)" onmouseUp="up_click()">
-<img src="sym/WhitePawn.png">
- </td><td class="n" id="3x3" onmouseDown="down_click(3,3)" onmouseUp="up_click()">
-<img src="sym/WhiteRook.png">
- </td><td class="n" id="4x3" onmouseDown="down_click(4,3)" onmouseUp="up_click()">
-<img src="sym/WhiteKnight.png">
- </td><td class="n" id="5x3" onmouseDown="down_click(5,3)" onmouseUp="up_click()">
-<img src="sym/WhiteQueen.png">
- </td><td class="n" id="6x3" onmouseDown="down_click(6,3)" onmouseUp="up_click()">
-<img src="sym/WhiteBishop.png">
- </td><td class="n" id="7x3" onmouseDown="down_click(7,3)" onmouseUp="up_click()">
-<img src="sym/WhiteKing.png">
- </td><td class="n" id="8x3">
+ <td class="n" id="sq6x5"></td>
- </td><td class="h" id="9x3">
+ <td class="n" id="sq7x5"></td>
-</td></tr><tr><td class="h" id="0x2">
+ <td class="n" id="sq8x5"></td>
- </td><td class="n" id="1x2">
+ <td class="h" id="sq9x5"></td>
- </td><td class="n" id="2x2">
+ <td class="h"><img src="sym/red.png"></td>
- </td><td class="n" id="3x2">
+ <td class="w">Capture only</td>
+ </tr>
- </td><td class="n" id="4x2">
+ <tr>
+ <td class="h" id="sq0x4"></td>
- </td><td class="n" id="5x2">
+ <td class="n" id="sq1x4"></td>
- </td><td class="n" id="6x2">
+ <td class="n" id="sq2x4"></td>
- </td><td class="n" id="7x2">
+ <td class="n" id="sq3x4"></td>
- </td><td class="n" id="8x2">
+ <td class="n" id="sq4x4"></td>
- </td><td class="h" id="9x2">
+ <td class="n" id="sq5x4" onmousedown="down_click(-5,4)"
+ onmouseup="up_click()"><img src="sym/WhiteElephant.png"></td>
-</td></tr><tr><td class="h" id="0x1">
+ <td class="n" id="sq6x4"></td>
- </td><td class="n" id="1x1">
+ <td class="n" id="sq7x4"></td>
- </td><td class="n" id="2x1" onmouseDown="down_click(-2,1)" onmouseUp="up_click()">
-<img src="sym/WhitePawn.png">
- </td><td class="n" id="3x1">
+ <td class="n" id="sq8x4"></td>
- </td><td class="n" id="4x1">
+ <td class="h" id="sq9x4"></td>
+ </tr>
- </td><td class="n" id="5x1">
+ <tr>
+ <td class="h" id="sq0x3"></td>
- </td><td class="n" id="6x1">
+ <td class="n" id="sq1x3" onmousedown="down_click(1,3)"
+ onmouseup="up_click()"><img src="sym/BlackPawn.png"></td>
- </td><td class="n" id="7x1">
+ <td class="n" id="sq2x3" onmousedown="down_click(2,3)"
+ onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
- </td><td class="n" id="8x1">
+ <td class="n" id="sq3x3" onmousedown="down_click(3,3)"
+ onmouseup="up_click()"><img src="sym/WhiteRook.png"></td>
- </td><td class="h" id="9x1">
-<img src="sym/WhiteElephant.png">
-</td></tr><tr><td class="h" id="0x0">
-
- </td><td class="n" id="1x0">
+ <td class="n" id="sq4x3" onmousedown="down_click(4,3)"
+ onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
- </td><td class="n" id="2x0">
+ <td class="n" id="sq5x3" onmousedown="down_click(5,3)"
+ onmouseup="up_click()"><img src="sym/WhiteQueen.png"></td>
- </td><td class="n" id="3x0">
-
- </td><td class="n" id="4x0">
-
- </td><td class="n" id="5x0">
-
- </td><td class="n" id="6x0">
-
- </td><td class="n" id="7x0" onmouseDown="down_click(7,0)" onmouseUp="up_click()">
-<img src="sym/WhiteKnight.png">
- </td><td class="n" id="8x0">
-
- </td><td class="h" id="9x0">
-<img src="sym/WhiteHawk.png">
-</td></tr></table>
-
-<p id="piece" height="20">:<br>:<br>:<br>:</p>
-
-<table cellpadding="5" border="1"><tr><td>
-Piece
- </td><td>
-ID
- </td><td>
-value
- </td><td>
-Moves (<a href="Betza.html">Betza notation</a>)
- </td><td>
-Remarks
-</td></tr><tr><td>
-King
- </td><td>
-K
- </td><td>
--
- </td><td>
-K
- </td><td>
-Can castle with Rook, moving 3 steps towards it
-</td></tr><tr><td>
-Queen
- </td><td>
-Q
- </td><td>
-9.5
- </td><td>
-RB or Q
- </td><td>
-
-</td></tr><tr><td>
-Elephant
- </td><td>
-E
- </td><td>
-9
- </td><td>
-RN
- </td><td>
-
-</td></tr><tr><td>
-Hawk
- </td><td>
-H
- </td><td>
-8.75
- </td><td>
-BN
- </td><td>
-
-</td></tr><tr><td>
-Rook
- </td><td>
-R
- </td><td>
-5
- </td><td>
-R
- </td><td>
-
-</td></tr><tr><td>
-Bishop
- </td><td>
-B
- </td><td>
-3.5
- </td><td>
-B
- </td><td>
-Color-bound
-</td></tr><tr><td>
-Knight
- </td><td>
-N
- </td><td>
-3
- </td><td>
-N
- </td><td>
-
-</td></tr><tr><td>
-Pawn
- </td><td>
-P
- </td><td>
-1
- </td><td>
-mfWcfF
- </td><td>
-Promotes to Q, E, H, R, B, or N on reaching last rank
-</td></tr></table>
-<h3>Pawn peculiarities</h3>
-<ul>
-<li>Pawns capture differently from how they move (straight move, diagonal capture).</li>
-<li>Pawns can move two squares ahead from their initial position, provided they are not blocked.</li>
-<li>On the move immediately after such a double push, they can be captured en passant by another Pawn,
-as if they had only moved 1 square ahead.</li>
-<li>Pawns promote to any other (non-royal) piece of choice when they reach last rank.</li>
-</ul>
-<h3>Castling</h3>
-<p>
-A King that has not moved before can move <b>three</b> squares in the direction of a Rook that has not moved before,
-in which case that Rook is moved to the square next to the King on the other side.
-This is only allowed if all squares between King and Rook are empty,
-when the King is not in check on the square it came from,
-and would not be in check on any of the squares it skipped over.
-</p>
-<h3>General rules</h3>
-<ul>
-<li>It is not allowed to expose your King to check.</li>
-<li>The game is won by checkmating the opponent's King.</li>
-<li>Stalemate (no legal moves, but not in check) is a draw.</li>
-<li>The Elephant or Hawk can be 'gated' into play, by placing them on a square evacuated by a back-rank piece
-that moved for the first time, as second part of the same turn.</li>
-<li>During gating, your King must not 'pass through check'.</li>
-<li>When castling, you can gate onto the King or Rook square, but not on both.</li>
-</ul>
-<h3>XBoard interface issues</h3>
-<p>
-To perform a gating move, first select the piece to be gated.
-(When you have not switched off highlighting or the line gap, this will draw a yellow border around the piece.)
-Then move the piece on the back rank.
-If you drag the piece, the gated piece will appear from under it.
-(With click-click moving you will only see it after the move is already done.)
-To gate on the Rook square after castling, you have to enter the castling by dragging the Rook onto the King!
-</p>
-<p>
-To enter a gating move by typing, you have to suffix them with /H or /E.
-For gating on the Rook square after castling, you would have to write the castling as RxK.
-(Ughh! Good thing that no one in his right mind would want to gate there!)
-</p>
-<h3>Differences with FIDE</h3>
-<p>
-The Elephant and Hawk pieces are extra, and enter the board by gating.
-</p>
-<h3>Strategy issues</h3>
-<p>
-It is not possible to force checkmate on a bare King with just a single Bishop or Knight (in addition to your own King).
-Two Knights cannot do that either.
-The Archbishop can force checkmate against a bare King.
-</p>
-<p>
-Bishops are confined to squares of a single color.
-Having Bishops on both colors compensates this weakness, and is worth an extra 0.5 on top of their added value.
-</p>
-<p>
-As Elephant and Hawk are nearly equal in value to Queen, under-promotion is very common.
-</p>
-<p>
-The super-pieces (Q, E, H) devaluate by the presence of lower-valued opponent pieces.
-As a result trading Q for R + B is in general a good trade when you still have E and H,
-as the latter gain in value by eliminating the opponent's R and B,
-which is more compensation than the intrinsic value difference between Q and R + B.
-</p>
-<p>
-Keeping E and H in hand is good if there are still many gating opportunities,
-as you can then gate at the location that is most damaging to your opponents position.
-When there are not too many positions left, protecting the remaining ones becomes a vulnerability, however,
-so you better use them were you still can.
-If you still have a piece in hand, and only a single Knight that can gate it (bacause all your other pieces already moved),
-even sacrificing a Queen for that Knight would gain your opponent a piece.
-</p>
-<p>
-</p>
-<p>
-</p>
+ <td class="n" id="sq6x3" onmousedown="down_click(6,3)"
+ onmouseup="up_click()"><img src="sym/WhiteBishop.png"></td>
+
+ <td class="n" id="sq7x3" onmousedown="down_click(7,3)"
+ onmouseup="up_click()"><img src="sym/WhiteKing.png"></td>
+
+ <td class="n" id="sq8x3"></td>
+
+ <td class="h" id="sq9x3"></td>
+ </tr>
+
+ <tr>
+ <td class="h" id="sq0x2"></td>
+
+ <td class="n" id="sq1x2"></td>
+
+ <td class="n" id="sq2x2"></td>
+
+ <td class="n" id="sq3x2"></td>
+
+ <td class="n" id="sq4x2"></td>
+
+ <td class="n" id="sq5x2"></td>
+
+ <td class="n" id="sq6x2"></td>
+
+ <td class="n" id="sq7x2"></td>
+
+ <td class="n" id="sq8x2"></td>
+
+ <td class="h" id="sq9x2"></td>
+ </tr>
+
+ <tr>
+ <td class="h" id="sq0x1"></td>
+
+ <td class="n" id="sq1x1"></td>
+
+ <td class="n" id="sq2x1" onmousedown="down_click(-2,1)"
+ onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
+
+ <td class="n" id="sq3x1"></td>
+
+ <td class="n" id="sq4x1"></td>
+
+ <td class="n" id="sq5x1"></td>
+
+ <td class="n" id="sq6x1"></td>
+
+ <td class="n" id="sq7x1"></td>
+
+ <td class="n" id="sq8x1"></td>
+
+ <td class="h" id="sq9x1"><img src="sym/WhiteElephant.png"></td>
+ </tr>
+
+ <tr>
+ <td class="h" id="sq0x0"></td>
+
+ <td class="n" id="sq1x0"></td>
+
+ <td class="n" id="sq2x0"></td>
+
+ <td class="n" id="sq3x0"></td>
+
+ <td class="n" id="sq4x0"></td>
+
+ <td class="n" id="sq5x0"></td>
+
+ <td class="n" id="sq6x0"></td>
+
+ <td class="n" id="sq7x0" onmousedown="down_click(7,0)"
+ onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
+
+ <td class="n" id="sq8x0"></td>
+
+ <td class="h" id="sq9x0"><img src="sym/WhiteHawk.png"></td>
+ </tr>
+ </table>
+
+ <p id="piece" height="20">:<br>
+ :<br>
+ :<br>
+ :</p>
+
+ <table cellpadding="5" border="1">
+ <tr>
+ <td>Piece</td>
+
+ <td>ID</td>
+
+ <td>value</td>
+
+ <td>Moves (<a href="Betza.html">Betza notation</a>)</td>
+
+ <td>Remarks</td>
+ </tr>
+
+ <tr>
+ <td>King</td>
+
+ <td>K</td>
+
+ <td>-</td>
+
+ <td>K</td>
+
+ <td>Can castle with Rook, moving 3 steps towards it</td>
+ </tr>
+
+ <tr>
+ <td>Queen</td>
+
+ <td>Q</td>
+
+ <td>9.5</td>
+
+ <td>RB or Q</td>
+
+ <td></td>
+ </tr>
+
+ <tr>
+ <td>Elephant</td>
+
+ <td>E</td>
+
+ <td>9</td>
+
+ <td>RN</td>
+
+ <td></td>
+ </tr>
+
+ <tr>
+ <td>Hawk</td>
+
+ <td>H</td>
+
+ <td>8.75</td>
+
+ <td>BN</td>
+
+ <td></td>
+ </tr>
+
+ <tr>
+ <td>Rook</td>
+
+ <td>R</td>
+
+ <td>5</td>
+
+ <td>R</td>
+
+ <td></td>
+ </tr>
+
+ <tr>
+ <td>Bishop</td>
+
+ <td>B</td>
+
+ <td>3.5</td>
+
+ <td>B</td>
+
+ <td>Color-bound</td>
+ </tr>
+
+ <tr>
+ <td>Knight</td>
+
+ <td>N</td>
+
+ <td>3</td>
+
+ <td>N</td>
+
+ <td></td>
+ </tr>
+
+ <tr>
+ <td>Pawn</td>
+
+ <td>P</td>
+
+ <td>1</td>
+
+ <td>mfWcfF</td>
+
+ <td>Promotes to Q, E, H, R, B, or N on reaching last
+ rank</td>
+ </tr>
+ </table>
+
+ <h3>Pawn peculiarities</h3>
+
+ <ul>
+ <li>Pawns capture differently from how they move (straight
+ move, diagonal capture).</li>
+
+ <li>Pawns can move two squares ahead from their initial
+ position, provided they are not blocked.</li>
+
+ <li>On the move immediately after such a double push, they can
+ be captured en passant by another Pawn, as if they had only
+ moved 1 square ahead.</li>
+
+ <li>Pawns promote to any other (non-royal) piece of choice when
+ they reach last rank.</li>
+ </ul>
+
+ <h3>Castling</h3>
+
+ <p>A King that has not moved before can move <b>three</b> squares
+ in the direction of a Rook that has not moved before, in which
+ case that Rook is moved to the square next to the King on the
+ other side. This is only allowed if all squares between King and
+ Rook are empty, when the King is not in check on the square it
+ came from, and would not be in check on any of the squares it
+ skipped over.</p>
+
+ <h3>General rules</h3>
+
+ <ul>
+ <li>It is not allowed to expose your King to check.</li>
+
+ <li>The game is won by checkmating the opponent's King.</li>
+
+ <li>Stalemate (no legal moves, but not in check) is a
+ draw.</li>
+
+ <li>The Elephant or Hawk can be 'gated' into play, by placing
+ them on a square evacuated by a back-rank piece that moved for
+ the first time, as second part of the same turn.</li>
+
+ <li>During gating, your King must not 'pass through
+ check'.</li>
+
+ <li>When castling, you can gate onto the King or Rook square,
+ but not on both.</li>
+ </ul>
+
+ <h3>XBoard interface issues</h3>
+
+ <p>To perform a gating move, first select the piece to be gated.
+ (When you have not switched off highlighting or the line gap,
+ this will draw a yellow border around the piece.) Then move the
+ piece on the back rank. If you drag the piece, the gated piece
+ will appear from under it. (With click-click moving you will only
+ see it after the move is already done.) To gate on the Rook
+ square after castling, you have to enter the castling by dragging
+ the Rook onto the King!</p>
+
+ <p>To enter a gating move by typing, you have to suffix them with
+ /H or /E. For gating on the Rook square after castling, you would
+ have to write the castling as RxK. (Ughh! Good thing that no one
+ in his right mind would want to gate there!)</p>
+
+ <h3>Differences with FIDE</h3>
+
+ <p>The Elephant and Hawk pieces are extra, and enter the board by
+ gating.</p>
+
+ <h3>Strategy issues</h3>
+
+ <p>It is not possible to force checkmate on a bare King with just
+ a single Bishop or Knight (in addition to your own King). Two
+ Knights cannot do that either. The Archbishop can force checkmate
+ against a bare King.</p>
+
+ <p>Bishops are confined to squares of a single color. Having
+ Bishops on both colors compensates this weakness, and is worth an
+ extra 0.5 on top of their added value.</p>
+
+ <p>As Elephant and Hawk are nearly equal in value to Queen,
+ under-promotion is very common.</p>
+
+ <p>The super-pieces (Q, E, H) devaluate by the presence of
+ lower-valued opponent pieces. As a result trading Q for R + B is
+ in general a good trade when you still have E and H, as the
+ latter gain in value by eliminating the opponent's R and B, which
+ is more compensation than the intrinsic value difference between
+ Q and R + B.</p>
+
+ <p>Keeping E and H in hand is good if there are still many gating
+ opportunities, as you can then gate at the location that is most
+ damaging to your opponents position. When there are not too many
+ positions left, protecting the remaining ones becomes a
+ vulnerability, however, so you better use them were you still
+ can. If you still have a piece in hand, and only a single Knight
+ that can gate it (bacause all your other pieces already moved),
+ even sacrificing a Queen for that Knight would gain your opponent
+ a piece.</p>
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projects / xboard.git / blobdiff