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10 <h1>Mighty Lion Chess</h1>
12 <table cellpadding="20">
14 <td><img src="Lion.png"></td>
17 <h3>Initial setup</h3>
22 a1, a8, h1, h8: Rook<br>
23 c1, c8, f1, f8: Bishop<br>
25 a2-h2, a7-h7: Pawns</p>
30 <h3>Moves at a Glance</h3>
32 <p>Click on a piece below to see its moves</p>
36 <td class="h" id="sq0x9"></td>
38 <td class="n" id="sq1x9" onmousedown="down_click(1,9)"
39 onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
41 <td class="n" id="sq2x9"></td>
43 <td class="n" id="sq3x9"></td>
45 <td class="n" id="sq4x9"></td>
47 <td class="n" id="sq5x9" onmousedown="down_click(5,9)"
48 onmouseup="up_click()"><img src="sym/BlackKing.png"></td>
50 <td class="n" id="sq6x9"></td>
52 <td class="n" id="sq7x9"></td>
54 <td class="n" id="sq8x9" onmousedown="down_click(8,9)"
55 onmouseup="up_click()"><img src="sym/BlackRook.png"></td>
57 <td class="h" id="sq9x9"></td>
59 <td class="h"><img src="sym/yellow.png"></td>
61 <td class="w" rowspan="2" valign="top">
62 <p>Sliding capture or non-capture,<br>
63 can be blocked on any square along the ray</p>
68 <td class="h" id="sq0x8"></td>
70 <td class="n" id="sq1x8"></td>
72 <td class="n" id="sq2x8"></td>
74 <td class="n" id="sq3x8"></td>
76 <td class="n" id="sq4x8"></td>
78 <td class="n" id="sq5x8"></td>
80 <td class="n" id="sq6x8"></td>
82 <td class="n" id="sq7x8"></td>
84 <td class="n" id="sq8x8"></td>
86 <td class="h" id="sq9x8"></td>
90 <td class="h" id="sq0x7"></td>
92 <td class="n" id="sq1x7"></td>
94 <td class="n" id="sq2x7"></td>
96 <td class="n" id="sq3x7"></td>
98 <td class="n" id="sq4x7"></td>
100 <td class="n" id="sq5x7"></td>
102 <td class="n" id="sq6x7"></td>
104 <td class="n" id="sq7x7"></td>
106 <td class="n" id="sq8x7"></td>
108 <td class="h" id="sq9x7"></td>
110 <td class="h"><img src="sym/orange.png"></td>
112 <td class="w">Unblockable leap (capture or non-capture)</td>
116 <td class="h" id="sq0x6"></td>
118 <td class="n" id="sq1x6"></td>
120 <td class="n" id="sq2x6"></td>
122 <td class="n" id="sq3x6"></td>
124 <td class="n" id="sq4x6"></td>
126 <td class="n" id="sq5x6"></td>
128 <td class="n" id="sq6x6" onmousedown="down_click(6,6)"
129 onmouseup="up_click()"><img src="sym/WhiteKing.png"></td>
131 <td class="n" id="sq7x6"></td>
133 <td class="n" id="sq8x6"></td>
135 <td class="h" id="sq9x6"></td>
137 <td class="h"><img src="sym/green.png"></td>
139 <td class="w">Non-capture only</td>
143 <td class="h" id="sq0x5"></td>
145 <td class="n" id="sq1x5"></td>
147 <td class="n" id="sq2x5"></td>
149 <td class="n" id="sq3x5"></td>
151 <td class="n" id="sq4x5"></td>
153 <td class="n" id="sq5x5"></td>
155 <td class="n" id="sq6x5"></td>
157 <td class="n" id="sq7x5" onmousedown="down_click(7,5)"
158 onmouseup="up_click()"><img src="sym/WhiteRook.png"></td>
160 <td class="n" id="sq8x5"></td>
162 <td class="h" id="sq9x5"></td>
164 <td class="h"><img src="sym/red.png"></td>
166 <td class="w">Capture only</td>
170 <td class="h" id="sq0x4"></td>
172 <td class="n" id="sq1x4"></td>
174 <td class="n" id="sq2x4"></td>
176 <td class="n" id="sq3x4"></td>
178 <td class="n" id="sq4x4" onmousedown="down_click(4,4)"
179 onmouseup="up_click()"><img src="sym/WhiteLion.png"></td>
181 <td class="n" id="sq5x4" onmousedown="down_click(5,4)"
182 onmouseup="up_click()"><img src="sym/WhiteQueen.png"></td>
184 <td class="n" id="sq6x4"></td>
186 <td class="n" id="sq7x4" onmousedown="down_click(7,4)"
187 onmouseup="up_click()"><img src="sym/WhiteBishop.png"></td>
189 <td class="n" id="sq8x4"></td>
191 <td class="h" id="sq9x4"></td>
193 <td class="h"><img src="sym/cyan.png"></td>
195 <td class="w" rowspan="2" valign="top">Captured while passing
196 through the square to another destination</td>
200 <td class="h" id="sq0x3"></td>
202 <td class="n" id="sq1x3"><img src="sym/BlackPawn.png"></td>
204 <td class="n" id="sq2x3"></td>
206 <td class="n" id="sq3x3"></td>
208 <td class="n" id="sq4x3" onmousedown="down_click(4,-3)"
209 onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
211 <td class="n" id="sq5x3"></td>
213 <td class="n" id="sq6x3"></td>
215 <td class="n" id="sq7x3"></td>
217 <td class="n" id="sq8x3"></td>
219 <td class="h" id="sq9x3"></td>
223 <td class="h" id="sq0x2"></td>
225 <td class="n" id="sq1x2"></td>
227 <td class="n" id="sq2x2"></td>
229 <td class="n" id="sq3x2"></td>
231 <td class="n" id="sq4x2"></td>
233 <td class="n" id="sq5x2"></td>
235 <td class="n" id="sq6x2"></td>
237 <td class="n" id="sq7x2" onmousedown="down_click(7,2)"
238 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
240 <td class="n" id="sq8x2"></td>
242 <td class="h" id="sq9x2"></td>
246 <td class="h" id="sq0x1"></td>
248 <td class="n" id="sq1x1"></td>
250 <td class="n" id="sq2x1" onmousedown="down_click(2,1)"
251 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
253 <td class="n" id="sq3x1"></td>
255 <td class="n" id="sq4x1"></td>
257 <td class="n" id="sq5x1"></td>
259 <td class="n" id="sq6x1"></td>
261 <td class="n" id="sq7x1"></td>
263 <td class="n" id="sq8x1"></td>
265 <td class="h" id="sq9x1"></td>
269 <td class="h" id="sq0x0"></td>
271 <td class="n" id="sq1x0"></td>
273 <td class="n" id="sq2x0"></td>
275 <td class="n" id="sq3x0"></td>
277 <td class="n" id="sq4x0"></td>
279 <td class="n" id="sq5x0"></td>
281 <td class="n" id="sq6x0"></td>
283 <td class="n" id="sq7x0"></td>
285 <td class="n" id="sq8x0"></td>
287 <td class="h" id="sq9x0"></td>
291 <p id="piece" height="20">:<br>
296 <table cellpadding="5" border="1">
304 <td>Moves (<a href="Betza.html">Betza notation</a>)</td>
318 <td>Can castle with Rook, moving 2 steps towards it</td>
328 <td>KADN(cK-aK)(K-bK)</td>
330 <td>Can make two independent King steps per turn (capturing
331 upto two pieces)</td>
391 <td>Promotes to Q, R, B, or N on reaching last rank</td>
395 <h3>Pawn peculiarities</h3>
398 <li>Pawns capture differently from how they move (straight
399 move, diagonal capture).</li>
401 <li>Pawns can move two squares straight ahead from their
402 initial position, provided they are not blocked.</li>
404 <li>On the move immediately after such a double push, they can
405 be captured en passant by another Pawn, as if they had only
406 moved 1 square ahead.</li>
408 <li>Pawns promote to another (non-royal) piece of choice when
409 they reach last rank.</li>
414 <p>A King that has not moved before can move two squares in the
415 direction of a Rook that has not moved before, in which case that
416 Rook is moved to the square the King skipped over. This is only
417 allowed if all squares between King and Rook are empty, when the
418 King is not in check on the square it came from, and would not be
419 in check on any of the squares it skipped over.</p>
421 <h3>General rules</h3>
424 <li>It is not allowed to expose your King to check.</li>
426 <li>The game is won by checkmating the opponent's King.</li>
428 <li>Stalemate (no legal moves, but not in check) is a
432 <h3>The Lion piece</h3>
434 <p>The Lion can make two moves per turn. That means it can also
435 capture two pieces per turn, one on the square it moves to (as
436 normal), and one 'en passant' on the transit square. It can also
437 capture on the transit square, and move on to an empty square
438 ('hit and run'), or capture and move back to where it came from
439 ('shooting' the piece from a distance, as it were). Of course it
440 can also capture a single piece in the normal Chess manner. In
441 that case the transit square is immaterial.</p>
443 <p>The Lion can make such double moves as two King steps, i.e. in
444 all directions, and arbitrarily changing direction between them.
445 It can also jump over the transit square, i.e. reach the distant
446 two-step destination in a single jump. Finally it can also just
447 make a step to an adjacent square, refraining from taking a
450 <h3>Restrictions on Lion capture</h3>
452 <p>There are rules to make Lion trading very difficult, in order
453 to keep the Lions in play. Basically they specify that two Lions
454 cannot be captured in consecutive half-moves. When the first
455 capture is Lion x Lion from a distance, it is forbidden to play
456 it if pseudo-legal (i.e. without taking account of check)
457 recapture of the capturing Lion is possible <i>with another piece
458 than King</i>. So even when the Lion is protected only with a
459 pinned piece, the other Lion cannot capture it <i>from a
460 distance</i>, just like a King could not capture it.</p>
462 <p>When a non-Lion captures a Lion, it is just the other way
463 around: then the 'counterstrike' by a non-Lion against the Lion
464 is forbidden. One possibility left open is thus when you capture
465 an adjacent Lion. But then you would in general be foolish to
466 allow recapture, as you could take the Lion hit-and-run fashion,
467 fleeing to a save square. An exception to the rule is when a
468 valuable opponent piece (i.e. not a Pawn) forms a 'bridge'
469 between the Lions; you may then capture that piece in the first
470 leg of the double-move, and then take the opponent Lion with the
471 second leg. Then the opponent can recapture, but he will have
472 lost a valuable piece. In the late end-game, when you have
473 nothing to protect your Lion with other than King, trading
474 becomes possible.</p>
476 <h3>XBoard interface issues</h3>
478 <p>This game has to be played with the option Show Target Squares
479 on! This option will cause marking of the target squares of any
480 piece you select or grab, by the engine (with legality testing
481 off) or by XBoard (legality testing on). Moving to a square
482 marked in cyan will be interpreted not as the final destination,
483 but as the transit square after the first step of a multi-leg
484 move. XBoard will then highlight the possible destination squares
485 of the second leg from there. Should you want to end on the cyan
486 square, you click it again, (it will be no longer marked in
487 cyan), and XBoard will terminate the move after the first leg.
488 You can also move back to the starting square, to 'shoot' the
489 opponent piece from nearby.</p>
491 <h3>Differences with FIDE</h3>
493 <p>One Knight is replaced by a Lion piece with very special
496 <h3>Strategy issues</h3>
498 <p>It is not possible to force checkmate on a bare King with just
499 a single Bishop or Knight (in addition to your own King). Two
500 Knights cannot do that either.</p>
502 <p>Bishops are confined to squares of a single color. Having
503 Bishops on both colors compensates this weakness, and is worth an
504 extra 0.5 on top of their added value.</p>
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