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2 <title>Two Kings</title>
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12 <table cellpadding="20">
14 <td><img src="TwoKings.png"></td>
17 <h3>Initial setup</h3>
19 <p>e1, e8, f1, f8: King<br>
21 a1, a8, h1, h8: Rook<br>
23 b1, b8, g1, g8: Knight<br>
24 a2-h2, a7-h7: Pawns</p>
29 <h3>Moves at a Glance</h3>
31 <p>Click on a piece below to see its moves</p>
35 <td class="h" id="sq0x9"></td>
37 <td class="n" id="sq1x9" onmousedown="down_click(1,-9)"
38 onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
40 <td class="n" id="sq2x9"></td>
42 <td class="n" id="sq3x9"></td>
44 <td class="n" id="sq4x9"></td>
46 <td class="n" id="sq5x9" onmousedown="down_click(5,9)"
47 onmouseup="up_click()"><img src="sym/BlackKing.png"></td>
49 <td class="n" id="sq6x9"></td>
51 <td class="n" id="sq7x9"></td>
53 <td class="n" id="sq8x9" onmousedown="down_click(8,9)"
54 onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
56 <td class="h" id="sq9x9"></td>
58 <td class="h"><img src="sym/yellow.png"></td>
60 <td class="w" rowspan="2" valign="top">
61 <p>Sliding capture or non-capture,<br>
62 can be blocked on any square along the ray</p>
67 <td class="h" id="sq0x8"></td>
69 <td class="n" id="sq1x8"></td>
71 <td class="n" id="sq2x8"></td>
73 <td class="n" id="sq3x8"></td>
75 <td class="n" id="sq4x8"></td>
77 <td class="n" id="sq5x8"></td>
79 <td class="n" id="sq6x8"></td>
81 <td class="n" id="sq7x8"></td>
83 <td class="n" id="sq8x8"></td>
85 <td class="h" id="sq9x8"></td>
89 <td class="h" id="sq0x7"></td>
91 <td class="n" id="sq1x7"></td>
93 <td class="n" id="sq2x7"></td>
95 <td class="n" id="sq3x7"></td>
97 <td class="n" id="sq4x7"></td>
99 <td class="n" id="sq5x7"></td>
101 <td class="n" id="sq6x7"></td>
103 <td class="n" id="sq7x7"></td>
105 <td class="n" id="sq8x7"></td>
107 <td class="h" id="sq9x7"></td>
109 <td class="h"><img src="sym/orange.png"></td>
111 <td class="w">Unblockable leap (capture or non-capture)</td>
115 <td class="h" id="sq0x6"></td>
117 <td class="n" id="sq1x6"></td>
119 <td class="n" id="sq2x6"></td>
121 <td class="n" id="sq3x6"></td>
123 <td class="n" id="sq4x6"></td>
125 <td class="n" id="sq5x6"></td>
127 <td class="n" id="sq6x6"></td>
129 <td class="n" id="sq7x6"></td>
131 <td class="n" id="sq8x6"></td>
133 <td class="h" id="sq9x6"></td>
135 <td class="h"><img src="sym/green.png"></td>
137 <td class="w">Non-capture only</td>
141 <td class="h" id="sq0x5"></td>
143 <td class="n" id="sq1x5"></td>
145 <td class="n" id="sq2x5"></td>
147 <td class="n" id="sq3x5"></td>
149 <td class="n" id="sq4x5"></td>
151 <td class="n" id="sq5x5"></td>
153 <td class="n" id="sq6x5"></td>
155 <td class="n" id="sq7x5"></td>
157 <td class="n" id="sq8x5"></td>
159 <td class="h" id="sq9x5"></td>
161 <td class="h"><img src="sym/red.png"></td>
163 <td class="w">Capture only</td>
167 <td class="h" id="sq0x4"></td>
169 <td class="n" id="sq1x4"></td>
171 <td class="n" id="sq2x4"></td>
173 <td class="n" id="sq3x4"></td>
175 <td class="n" id="sq4x4"></td>
177 <td class="n" id="sq5x4"></td>
179 <td class="n" id="sq6x4"></td>
181 <td class="n" id="sq7x4"></td>
183 <td class="n" id="sq8x4"></td>
185 <td class="h" id="sq9x4"></td>
189 <td class="h" id="sq0x3"></td>
191 <td class="n" id="sq1x3" onmousedown="down_click(1,3)"
192 onmouseup="up_click()"><img src="sym/BlackPawn.png"></td>
194 <td class="n" id="sq2x3" onmousedown="down_click(2,3)"
195 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
197 <td class="n" id="sq3x3" onmousedown="down_click(3,3)"
198 onmouseup="up_click()"><img src="sym/WhiteRook.png"></td>
200 <td class="n" id="sq4x3" onmousedown="down_click(4,3)"
201 onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
203 <td class="n" id="sq5x3" onmousedown="down_click(5,3)"
204 onmouseup="up_click()"><img src="sym/WhiteQueen.png"></td>
206 <td class="n" id="sq6x3" onmousedown="down_click(6,3)"
207 onmouseup="up_click()"><img src="sym/WhiteBishop.png"></td>
209 <td class="n" id="sq7x3" onmousedown="down_click(7,3)"
210 onmouseup="up_click()"><img src="sym/WhiteKing.png"></td>
212 <td class="n" id="sq8x3"></td>
214 <td class="h" id="sq9x3"></td>
218 <td class="h" id="sq0x2"></td>
220 <td class="n" id="sq1x2"></td>
222 <td class="n" id="sq2x2"></td>
224 <td class="n" id="sq3x2"></td>
226 <td class="n" id="sq4x2"></td>
228 <td class="n" id="sq5x2"></td>
230 <td class="n" id="sq6x2"></td>
232 <td class="n" id="sq7x2"></td>
234 <td class="n" id="sq8x2"></td>
236 <td class="h" id="sq9x2"></td>
240 <td class="h" id="sq0x1"></td>
242 <td class="n" id="sq1x1"></td>
244 <td class="n" id="sq2x1" onmousedown="down_click(-2,1)"
245 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
247 <td class="n" id="sq3x1"></td>
249 <td class="n" id="sq4x1"></td>
251 <td class="n" id="sq5x1"></td>
253 <td class="n" id="sq6x1"></td>
255 <td class="n" id="sq7x1"></td>
257 <td class="n" id="sq8x1"></td>
259 <td class="h" id="sq9x1"></td>
263 <td class="h" id="sq0x0"></td>
265 <td class="n" id="sq1x0"></td>
267 <td class="n" id="sq2x0"></td>
269 <td class="n" id="sq3x0"></td>
271 <td class="n" id="sq4x0"></td>
273 <td class="n" id="sq5x0"></td>
275 <td class="n" id="sq6x0"></td>
277 <td class="n" id="sq7x0"></td>
279 <td class="n" id="sq8x0"></td>
281 <td class="h" id="sq9x0"></td>
285 <p id="piece" height="20">:<br>
290 <table cellpadding="5" border="1">
298 <td>Moves (<a href="Betza.html">Betza notation</a>)</td>
312 <td>Can castle with Rook, moving 2 steps towards it</td>
372 <td>Promotes to Q, R, B, or N on reaching last rank</td>
376 <h3>Pawn peculiarities</h3>
379 <li>Pawns capture differently from how they move (straight
380 move, diagonal capture).</li>
382 <li>Pawns can move two squares straight ahead from their
383 initial position, provided they are not blocked.</li>
385 <li>On the move immediately after such a double push, they can
386 be captured en passant by another Pawn, as if they had only
387 moved 1 square ahead.</li>
389 <li>Pawns promote to another (non-royal) piece of choice when
390 they reach last rank.</li>
395 <p>An e-file King that has not moved before can move two squares
396 in the direction of a Rook that has not moved before, in which
397 case that Rook is moved to the square the King skipped over. This
398 is only allowed if all squares between King and Rook are empty,
399 when the King is not in check on the square it came from, and
400 would not be in check on any of the squares it skipped over.</p>
402 <h3>General rules</h3>
405 <li>The King closest to square a1 is the royal one (horizontal
406 measure prevailing over vertical).</li>
408 <li>It is not allowed to expose your <b>royal</b> King to
409 capture ('check').</li>
411 <li>The game is won by checkmating the opponent (i.e. being in
412 check, and not being able to get out of it).</li>
414 <li>Stalemate (no legal moves, but not in check) is a
418 <h3>Differences with FIDE</h3>
420 <p>You have a pair of Kings, and only a single Bishop. Only one
421 of the Kings is royal, but which one can change during the game,
422 as it depends on their relative location on the board.</p>
424 <h3>Strategy issues</h3>
426 <p>It is not possible to force checkmate on a bare King with just
427 a single Bishop or Knight (in addition to your own King). Two
428 Knights cannot do that either. Two Kings can force checkmate on a
429 bare King.</p>Your non-royal King can be exposed to capture, and
430 thus captured. After that, the remaining King will always be
431 royal. Once both sides are down to a single King, this variant
432 degenerate to orthodox Chess. The spare King is a tough defender,
433 because it cannot be attacked by the opponent's royal King. So if
434 all the attacker's power is in a single piece, the defending King
435 pair has little to fear when they protect each other. This makes
436 even KQKK is a draw (provided the Kings can connect).
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