3 <title>Cylinder Chess</title>
4 <link rel=StyleSheet href="./moves.css" type="text/css">
5 <script type="text/javascript" src="spartan.js"></script>
8 <h1>Cylinder Chess</h1>
9 <table cellpadding="20"><tr><td>
12 <h3>Initial setup</h3>
20 c1, c8, f1, f8: Bishop
22 b1, b8, g1, g8: Knight
28 <h3>Moves at a Glance</h3>
30 <p>Click on a piece below to see its moves</p>
32 <table class="board"><tr><td class="h" id="0x9">
34 </td><td class="n" id="1x9" onmouseDown="down_click(1,-9)" onmouseUp="up_click()">
35 <img src="sym/BlackRook.png">
36 </td><td class="n" id="2x9">
38 </td><td class="n" id="3x9">
40 </td><td class="n" id="4x9">
42 </td><td class="n" id="5x9" onmouseDown="down_click(5,9)" onmouseUp="up_click()">
43 <img src="sym/BlackKing.png">
44 </td><td class="n" id="6x9">
46 </td><td class="n" id="7x9">
48 </td><td class="n" id="8x9" onmouseDown="down_click(8,9)" onmouseUp="up_click()">
49 <img src="sym/BlackRook.png">
50 </td><td class="h" id="9x9">
53 <img src="sym/yellow.png">
54 </td><td class="w" rowspan="2" valign="top">
55 <p>Sliding capture or non-capture,<br>can be blocked on any square along the ray</p>
56 </td></tr><tr><td class="h" id="0x8">
58 </td><td class="n" id="1x8">
60 </td><td class="n" id="2x8">
62 </td><td class="n" id="3x8">
64 </td><td class="n" id="4x8">
66 </td><td class="n" id="5x8">
68 </td><td class="n" id="6x8">
70 </td><td class="n" id="7x8">
72 </td><td class="n" id="8x8">
74 </td><td class="h" id="9x8">
76 </td></tr><tr><td class="h" id="0x7">
78 </td><td class="n" id="1x7">
80 </td><td class="n" id="2x7">
82 </td><td class="n" id="3x7">
84 </td><td class="n" id="4x7">
86 </td><td class="n" id="5x7">
88 </td><td class="n" id="6x7">
90 </td><td class="n" id="7x7">
92 </td><td class="n" id="8x7">
94 </td><td class="h" id="9x7">
97 <img src="sym/orange.png">
99 Unblockable leap (capture or non-capture)
100 </td></tr><tr><td class="h" id="0x6">
102 </td><td class="n" id="1x6">
104 </td><td class="n" id="2x6">
106 </td><td class="n" id="3x6">
108 </td><td class="n" id="4x6">
110 </td><td class="n" id="5x6">
112 </td><td class="n" id="6x6">
114 </td><td class="n" id="7x6">
116 </td><td class="n" id="8x6">
118 </td><td class="h" id="9x6">
121 <img src="sym/green.png">
124 </td></tr><tr><td class="h" id="0x5">
126 </td><td class="n" id="1x5">
128 </td><td class="n" id="2x5">
130 </td><td class="n" id="3x5">
132 </td><td class="n" id="4x5">
134 </td><td class="n" id="5x5">
136 </td><td class="n" id="6x5">
138 </td><td class="n" id="7x5">
140 </td><td class="n" id="8x5">
142 </td><td class="h" id="9x5">
145 <img src="sym/red.png">
148 </td></tr><tr><td class="h" id="0x4">
150 </td><td class="n" id="1x4">
152 </td><td class="n" id="2x4">
154 </td><td class="n" id="3x4">
156 </td><td class="n" id="4x4">
158 </td><td class="n" id="5x4">
160 </td><td class="n" id="6x4">
162 </td><td class="n" id="7x4">
164 </td><td class="n" id="8x4">
166 </td><td class="h" id="9x4">
168 </td></tr><tr><td class="h" id="0x3">
170 </td><td class="n" id="1x3" onmouseDown="down_click(1,3)" onmouseUp="up_click()">
171 <img src="sym/BlackPawn.png">
172 </td><td class="n" id="2x3" onmouseDown="down_click(2,3)" onmouseUp="up_click()">
173 <img src="sym/WhitePawn.png">
174 </td><td class="n" id="3x3" onmouseDown="down_click(3,3)" onmouseUp="up_click()">
175 <img src="sym/WhiteRook.png">
176 </td><td class="n" id="4x3" onmouseDown="down_click(4,3)" onmouseUp="up_click()">
177 <img src="sym/WhiteKnight.png">
178 </td><td class="n" id="5x3" onmouseDown="down_click(5,3)" onmouseUp="up_click()">
179 <img src="sym/WhiteQueen.png">
180 </td><td class="n" id="6x3" onmouseDown="down_click(6,3)" onmouseUp="up_click()">
181 <img src="sym/WhiteBishop.png">
182 </td><td class="n" id="7x3" onmouseDown="down_click(7,3)" onmouseUp="up_click()">
183 <img src="sym/WhiteKing.png">
184 </td><td class="n" id="8x3">
186 </td><td class="h" id="9x3">
188 </td></tr><tr><td class="h" id="0x2">
190 </td><td class="n" id="1x2">
192 </td><td class="n" id="2x2">
194 </td><td class="n" id="3x2">
196 </td><td class="n" id="4x2">
198 </td><td class="n" id="5x2">
200 </td><td class="n" id="6x2">
202 </td><td class="n" id="7x2">
204 </td><td class="n" id="8x2">
206 </td><td class="h" id="9x2">
208 </td></tr><tr><td class="h" id="0x1">
210 </td><td class="n" id="1x1">
212 </td><td class="n" id="2x1" onmouseDown="down_click(-2,1)" onmouseUp="up_click()">
213 <img src="sym/WhitePawn.png">
214 </td><td class="n" id="3x1">
216 </td><td class="n" id="4x1">
218 </td><td class="n" id="5x1">
220 </td><td class="n" id="6x1">
222 </td><td class="n" id="7x1">
224 </td><td class="n" id="8x1">
226 </td><td class="h" id="9x1">
228 </td></tr><tr><td class="h" id="0x0">
230 </td><td class="n" id="1x0">
232 </td><td class="n" id="2x0">
234 </td><td class="n" id="3x0">
236 </td><td class="n" id="4x0">
238 </td><td class="n" id="5x0">
240 </td><td class="n" id="6x0">
242 </td><td class="n" id="7x0">
244 </td><td class="n" id="8x0">
246 </td><td class="h" id="9x0">
250 <p id="piece" height="20">:<br>:<br>:<br>:</p>
252 <table cellpadding="5" border="1"><tr><td>
259 Moves (<a href="Betza.html">Betza notation</a>)
271 Can castle with Rook, moving 2 steps towards it
321 Promotes to Q, R, B, or N on reaching last rank
323 <h3>Pawn peculiarities</h3>
325 <li>Pawns capture differently from how they move (straight move, diagonal capture).</li>
326 <li>Pawns can move two squares straight ahead from their initial position, provided they are not blocked.</li>
327 <li>On the move immediately after such a double push, they can be captured en passant by another Pawn,
328 as if they had only moved 1 square ahead.</li>
329 <li>Pawns promote to another (non-royal) piece of choice when they reach last rank.</li>
333 A King that has not moved before can move two squares in the direction of a Rook that has not moved before,
334 in which case that Rook is moved to the square the King skipped over.
335 This is only allowed if all squares between King and Rook are empty,
336 when the King is not in check on the square it came from,
337 and would not be in check on any of the squares it skipped over.
339 <h3>General rules</h3>
341 <li><b>The board wraps around like a cylinder, the h-file connecting to the a-file</b>.</li>
342 <li>It is not allowed to expose your King to check.</li>
343 <li>The game is won by checkmating the opponent's King.</li>
344 <li>Stalemate (no legal moves, but not in check) is a draw.</li>
346 <h3>XBoard interface issues</h3>
348 Cylinder Chess must be played with legality testing off, as XBoard does not understand the wrapping of the board.
350 <h3>Differences with FIDE</h3>
352 The board wraps around as a cylinder.
354 <h3>Strategy issues</h3>
356 It is not possible to force checkmate on a bare King with just a single <b>Rook</b>,Bishop or Knight (in addition to your own King).
357 Two Knights and Bishops in any combination cannot do that either.
358 (Because the board has no corners, forcing checkmate has become much more difficult.)
361 Bishops are confined to squares of a single color.
362 Having Bishops on both colors compensates this weakness, and is worth an extra 0.5 on top of their added value.
365 The Rook and Knight hardly benefit from the cylinder board.
366 The Bishop, whose moves normally often end on the left or right board edge, does benefit some,
367 and a Queen gets very dangerous.