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2 <title>Grand Chess</title>
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12 <table cellpadding="20">
17 <p><i>Captured pieces will be displayed beside the board
18 for promotion choice</i></p>
22 <h3>Initial setup</h3>
26 f1, f8: Chancellor<br>
27 g1, g8: Archbishop<br>
28 a0, a9, j0, j9: Rook<br>
29 c1, c8, h1, h8: Bishop<br>
30 b1, b8, i1, i8: Knight<br>
31 a2-j2, a7-j7: Pawns</p>
36 <h3>Moves at a Glance</h3>
38 <p>Click on a piece below to see its moves</p>
42 <td class="n" id="sq0x9"></td>
44 <td class="n" id="sq1x9"></td>
46 <td class="n" id="sq2x9"></td>
48 <td class="n" id="sq3x9"></td>
50 <td class="n" id="sq4x9"></td>
52 <td class="n" id="sq5x9"></td>
54 <td class="n" id="sq6x9"></td>
56 <td class="n" id="sq7x9"></td>
58 <td class="n" id="sq8x9"></td>
60 <td class="n" id="sq9x9"></td>
62 <td class="h"><img src="sym/yellow.png"></td>
64 <td class="w" rowspan="2" valign="top">
65 <p>Sliding capture or non-capture,<br>
66 can be blocked on any square along the ray</p>
71 <td class="n" id="sq0x8"></td>
73 <td class="n" id="sq1x8"></td>
75 <td class="n" id="sq2x8"></td>
77 <td class="n" id="sq3x8"></td>
79 <td class="n" id="sq4x8"></td>
81 <td class="n" id="sq5x8"></td>
83 <td class="n" id="sq6x8"></td>
85 <td class="n" id="sq7x8"></td>
87 <td class="n" id="sq8x8"></td>
89 <td class="n" id="sq9x8"></td>
93 <td class="n" id="sq0x7"></td>
95 <td class="n" id="sq1x7"></td>
97 <td class="n" id="sq2x7"></td>
99 <td class="n" id="sq3x7"></td>
101 <td class="n" id="sq4x7"></td>
103 <td class="n" id="sq5x7"></td>
105 <td class="n" id="sq6x7"></td>
107 <td class="n" id="sq7x7"></td>
109 <td class="n" id="sq8x7"></td>
111 <td class="n" id="sq9x7"></td>
113 <td class="h"><img src="sym/orange.png"></td>
115 <td class="w">Unblockable leap (capture or non-capture)</td>
119 <td class="n" id="sq0x6"></td>
121 <td class="n" id="sq1x6"></td>
123 <td class="n" id="sq2x6"></td>
125 <td class="n" id="sq3x6"></td>
127 <td class="n" id="sq4x6"></td>
129 <td class="n" id="sq5x6" onmousedown="down_click(5,6)"
130 onmouseup="up_click()"><img src=
131 "sym/WhiteArchbishop.png"></td>
133 <td class="n" id="sq6x6"></td>
135 <td class="n" id="sq7x6"></td>
137 <td class="n" id="sq8x6"></td>
139 <td class="n" id="sq9x6"></td>
141 <td class="h"><img src="sym/green.png"></td>
143 <td class="w">Non-capture only</td>
147 <td class="n" id="sq0x5"></td>
149 <td class="n" id="sq1x5"></td>
151 <td class="n" id="sq2x5"></td>
153 <td class="n" id="sq3x5"></td>
155 <td class="n" id="sq4x5"></td>
157 <td class="n" id="sq5x5"></td>
159 <td class="n" id="sq6x5"></td>
161 <td class="n" id="sq7x5"></td>
163 <td class="n" id="sq8x5"></td>
165 <td class="n" id="sq9x5"></td>
167 <td class="h"><img src="sym/red.png"></td>
169 <td class="w">Capture only</td>
173 <td class="n" id="sq0x4"></td>
175 <td class="n" id="sq1x4"></td>
177 <td class="n" id="sq2x4"></td>
179 <td class="n" id="sq3x4"></td>
181 <td class="n" id="sq4x4"></td>
183 <td class="n" id="sq5x4" onmousedown="down_click(5,4)"
184 onmouseup="up_click()"><img src="sym/WhiteMarshall.png"></td>
186 <td class="n" id="sq6x4"></td>
188 <td class="n" id="sq7x4"></td>
190 <td class="n" id="sq8x4"></td>
192 <td class="n" id="sq9x4"></td>
196 <td class="n" id="sq0x3"></td>
198 <td class="n" id="sq1x3" onmousedown="down_click(1,3)"
199 onmouseup="up_click()"><img src="sym/BlackPawn.png"></td>
201 <td class="n" id="sq2x3" onmousedown="down_click(2,3)"
202 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
204 <td class="n" id="sq3x3" onmousedown="down_click(3,3)"
205 onmouseup="up_click()"><img src="sym/WhiteRook.png"></td>
207 <td class="n" id="sq4x3" onmousedown="down_click(4,3)"
208 onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
210 <td class="n" id="sq5x3" onmousedown="down_click(5,3)"
211 onmouseup="up_click()"><img src="sym/WhiteQueen.png"></td>
213 <td class="n" id="sq6x3" onmousedown="down_click(6,3)"
214 onmouseup="up_click()"><img src="sym/WhiteBishop.png"></td>
216 <td class="n" id="sq7x3" onmousedown="down_click(7,3)"
217 onmouseup="up_click()"><img src="sym/WhiteKing.png"></td>
219 <td class="n" id="sq8x3"></td>
221 <td class="n" id="sq9x3"></td>
225 <td class="n" id="sq0x2"></td>
227 <td class="n" id="sq1x2"></td>
229 <td class="n" id="sq2x2"></td>
231 <td class="n" id="sq3x2"></td>
233 <td class="n" id="sq4x2"></td>
235 <td class="n" id="sq5x2"></td>
237 <td class="n" id="sq6x2"></td>
239 <td class="n" id="sq7x2"></td>
241 <td class="n" id="sq8x2"></td>
243 <td class="n" id="sq9x2"></td>
247 <td class="n" id="sq0x1"></td>
249 <td class="n" id="sq1x1"></td>
251 <td class="n" id="sq2x1" onmousedown="down_click(-2,1)"
252 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
254 <td class="n" id="sq3x1"></td>
256 <td class="n" id="sq4x1"></td>
258 <td class="n" id="sq5x1"></td>
260 <td class="n" id="sq6x1"></td>
262 <td class="n" id="sq7x1"></td>
264 <td class="n" id="sq8x1"></td>
266 <td class="n" id="sq9x1"></td>
270 <td class="n" id="sq0x0"></td>
272 <td class="n" id="sq1x0"></td>
274 <td class="n" id="sq2x0"></td>
276 <td class="n" id="sq3x0"></td>
278 <td class="n" id="sq4x0"></td>
280 <td class="n" id="sq5x0"></td>
282 <td class="n" id="sq6x0"></td>
284 <td class="n" id="sq7x0"></td>
286 <td class="n" id="sq8x0"></td>
288 <td class="n" id="sq9x0"></td>
292 <p id="piece" height="20">:<br>
297 <table cellpadding="5" border="1">
305 <td>Moves (<a href="Betza.html">Betza notation</a>)</td>
403 <td>Promotes to any other piece that was captured</td>
407 <h3>Pawn peculiarities</h3>
410 <li>Pawns capture differently from how they move (straight
411 move, diagonal capture).</li>
413 <li>Pawns can move two squares ahead from their initial
414 position, provided they are not blocked.</li>
416 <li>On the move immediately after such a double push, they can
417 be captured en passant by another Pawn, as if they had only
418 moved 1 square ahead.</li>
420 <li>Pawns promote to a piece chosen from the set of captured
421 pieces when moving in or into the promotion zone.</li>
423 <li>The Promotion zone consists of the last three ranks.</li>
425 <li>When arriving on last rank, promotion is mandatory. On
426 other ranks it is optional.</li>
428 <li>If no promotion piece is available for a mandatory
429 promotion, the Pawn cannot be advanced.</li>
432 <h3>General rules</h3>
435 <li>It is not allowed to expose your King to check.</li>
437 <li>The game is won by checkmating the opponent's King.</li>
439 <li>Stalemate (no legal moves, but not in check) is a
443 <h3>XBoard interface issues</h3>
445 <p>When a Pawn can be promoted, XBoard first advances it as a
446 Pawn to the promotion square. Then it waits for you to complete
447 the move entry by clicking on the piece in the holdings beside
448 the board that you want to promote to. To defer promotion you can
449 click on a Pawn or on an empty square in the holdings of the
452 <h3>Differences with FIDE</h3>
454 <p>The Chancellor and Archbishop pieces are extra, and the board
455 is expanded to accomodate them. There is no castling. Promotion
456 only allows you to regain back a piece that you lost before. The
457 promotion zone is 3 ranks deep, and promotion is only mandatory
460 <h3>Strategy issues</h3>
462 <p>It is not possible to force checkmate on a bare King with just
463 a single Bishop or Knight (in addition to your own King). Two
464 Knights cannot do that either. The Archbishop can force checkmate
465 against a bare King.</p>
467 <p>Bishops are confined to squares of a single color. Having
468 Bishops on both colors compensates this weakness, and is worth an
469 extra 0.5 on top of their added value.</p>
471 <p>As Chancellor and Archbishop are nearly equal in value to
472 Queen, under-promotion is very common.</p>
474 <p>The super-pieces (Q, C, A) devaluate by the presence of
475 lower-valued opponent pieces. As a result trading Q for R + B is
476 in not as bad when you still have A and C, as the latter gain in
477 value by eliminating the opponent's R and B, which is more
478 compensation than the intrinsic value difference between Q and R
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