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10 <h1>Chu Shogi (Ancient Japanese Chess)</h1>
12 <p>Chu Shogi was already known in the year 1250, and has been the
13 dominant form of Chess in Japan for many centuries. In recent
14 time, after the invention of piece drops, it was overtaken in
15 popularity by modern Shogi. It is still widely played in Japan,
18 <table cellpadding="20">
20 <td><img src="Chu.png"></td>
23 <h3>Initial setup</h3>
27 g2, f9: Queen (Free King)<br>
28 e2, e9, h2, h9: Dragon King<br>
29 d2, d9, i2, i9: Dragon Horse<br>
30 c2, c9, j2, j9: Rook<br>
31 c1, c10, j1, j10: Bishop<br>
32 b2, b9, k2, k9: Vertical Mover<br>
33 a2, a9, l2, l9: Side Mover<br>
34 a1, a10, l1, l10: Canon (Reverse Chariot)<br>
35 a0, a11, l0, l11: Lance<br>
39 e1, e10, h1, h10: Blind Tiger<br>
40 e0, e11, h0, h11: Gold General<br>
41 d0, d11, i0, i11: Silver General<br>
42 c0, c11, j0, j11: Copper General<br>
43 b0, b11, k0, k11: Ferocious Leopard<br>
44 d4, d7, i4, i7: Cobra (Go Between)<br>
45 a3-l3, a8-l8: Pawns</p>
50 <h3>Moves at a Glance</h3>
52 <p>Click on a piece below to see its moves</p>
56 <td class="n" id="sq0x9" onmousedown="down_click(,)" onmouseup=
59 <td class="n" id="sq1x9"></td>
61 <td class="n" id="sq2x9"></td>
63 <td class="n" id="sq3x9"></td>
65 <td class="n" id="sq4x9"></td>
67 <td class="n" id="sq5x9"></td>
69 <td class="n" id="sq6x9"></td>
71 <td class="n" id="sq7x9"></td>
73 <td class="n" id="sq8x9"></td>
75 <td class="n" id="sq9x9"></td>
77 <td class="h"><img src="sym/yellow.png"></td>
79 <td class="w" rowspan="2" valign="top">
80 <p>Sliding capture or non-capture,<br>
81 can be blocked on any square along the ray</p>
86 <td class="n" id="sq0x8"></td>
88 <td class="n" id="sq1x8"></td>
90 <td class="n" id="sq2x8"></td>
92 <td class="n" id="sq3x8"></td>
94 <td class="n" id="sq4x8"></td>
96 <td class="n" id="sq5x8"></td>
98 <td class="n" id="sq6x8"></td>
100 <td class="n" id="sq7x8"></td>
102 <td class="n" id="sq8x8"></td>
104 <td class="n" id="sq9x8"></td>
108 <td class="n" id="sq0x7"></td>
110 <td class="n" id="sq1x7"></td>
112 <td class="n" id="sq2x7"></td>
114 <td class="n" id="sq3x7" onmousedown="down_click(3,7)"
115 onmouseup="up_click()"><img src="sym/WhiteGold.png"></td>
117 <td class="n" id="sq4x7" onmousedown="down_click(4,7)"
118 onmouseup="up_click()"><img src="sym/WhiteAdvisor.png"></td>
120 <td class="n" id="sq5x7" onmousedown="down_click(5,7)"
121 onmouseup="up_click()"><img src="sym/WhiteCommoner.png"></td>
123 <td class="n" id="sq6x7"></td>
125 <td class="n" id="sq7x7"></td>
127 <td class="n" id="sq8x7"></td>
129 <td class="n" id="sq9x7"></td>
131 <td class="h"><img src="sym/orange.png"></td>
133 <td class="w">Unblockable leap (capture or non-capture)</td>
137 <td class="n" id="sq0x6"></td>
139 <td class="n" id="sq1x6"></td>
141 <td class="n" id="sq2x6"></td>
143 <td class="n" id="sq3x6" onmousedown="down_click(3,6)"
144 onmouseup="up_click()"><img src="sym/WhiteLeopard.png"></td>
146 <td class="n" id="sq4x6" onmousedown="down_click(4,6)"
147 onmouseup="up_click()"><img src="sym/WhiteDolphin.png"></td>
149 <td class="n" id="sq5x6" onmousedown="down_click(5,6)"
150 onmouseup="up_click()"><img src="sym/WhiteCanon.png"></td>
152 <td class="n" id="sq6x6" onmousedown="down_click(6,6)"
153 onmouseup="up_click()"><img src="sym/WhiteKing.png"></td>
155 <td class="n" id="sq7x6" onmousedown="down_click(7,6)"
156 onmouseup="up_click()"><img src="sym/WhiteElephant.png"></td>
158 <td class="n" id="sq8x6"></td>
160 <td class="n" id="sq9x6"></td>
162 <td class="h"><img src="sym/cyan.png"></td>
164 <td class="w" rowspan="2" valign="top">Captured while passing
165 through the square to another destination</td>
169 <td class="n" id="sq0x5"></td>
171 <td class="n" id="sq1x5"></td>
173 <td class="n" id="sq2x5" onmousedown="down_click(2,5)"
174 onmouseup="up_click()"><img src="sym/WhiteSword.png"></td>
176 <td class="n" id="sq3x5" onmousedown="down_click(3,5)"
177 onmouseup="up_click()"><img src="sym/WhitePrincess.png"></td>
179 <td class="n" id="sq4x5" onmousedown="down_click(4,5)"
180 onmouseup="up_click()"><img src="sym/WhiteHawk.png"></td>
182 <td class="n" id="sq5x5" onmousedown="down_click(5,5)"
183 onmouseup="up_click()"><img src="sym/WhiteUnicorn.png"></td>
185 <td class="n" id="sq6x5" onmousedown="down_click(6,5)"
186 onmouseup="up_click()"><img src=
187 "sym/WhiteCrownedRook.png"></td>
189 <td class="n" id="sq7x5" onmousedown="down_click(7,5)"
190 onmouseup="up_click()"><img src="sym/WhiteRook.png"></td>
192 <td class="n" id="sq8x5"></td>
194 <td class="n" id="sq9x5"></td>
198 <td class="n" id="sq0x4"></td>
200 <td class="n" id="sq1x4"></td>
202 <td class="n" id="sq2x4" onmousedown="down_click(2,4)"
203 onmouseup="up_click()"><img src="sym/WhiteHSword.png"></td>
205 <td class="n" id="sq3x4" onmousedown="down_click(3,4)"
206 onmouseup="up_click()"><img src="sym/WhiteHCrown.png"></td>
208 <td class="n" id="sq4x4" onmousedown="down_click(4,4)"
209 onmouseup="up_click()"><img src="sym/WhiteLion.png"></td>
211 <td class="n" id="sq5x4" onmousedown="down_click(5,4)"
212 onmouseup="up_click()"><img src="sym/WhiteQueen.png"></td>
214 <td class="n" id="sq6x4" onmousedown="down_click(6,4)"
215 onmouseup="up_click()"><img src=
216 "sym/WhiteCrownedBishop.png"></td>
218 <td class="n" id="sq7x4" onmousedown="down_click(7,4)"
219 onmouseup="up_click()"><img src="sym/WhiteBishop.png"></td>
221 <td class="n" id="sq8x4"></td>
223 <td class="n" id="sq9x4"></td>
227 <td class="n" id="sq0x3"></td>
229 <td class="n" id="sq1x3"></td>
231 <td class="n" id="sq2x3" onmousedown="down_click(2,3)"
232 onmouseup="up_click()"><img src="sym/WhiteCobra.png"></td>
234 <td class="n" id="sq3x3" onmousedown="down_click(3,3)"
235 onmouseup="up_click()"><img src="sym/WhiteMarshall.png"></td>
237 <td class="n" id="sq4x3" onmousedown="down_click(4,3)"
238 onmouseup="up_click()"><img src="sym/WhiteKnight.png"></td>
240 <td class="n" id="sq5x3" onmousedown="down_click(5,3)"
241 onmouseup="up_click()"><img src=
242 "sym/WhiteChancellor.png"></td>
244 <td class="n" id="sq6x3" onmousedown="down_click(6,3)"
245 onmouseup="up_click()"><img src=
246 "sym/WhiteArchbishop.png"></td>
248 <td class="n" id="sq7x3"></td>
250 <td class="n" id="sq8x3"></td>
252 <td class="n" id="sq9x3"></td>
256 <td class="n" id="sq0x2"></td>
258 <td class="n" id="sq1x2"></td>
260 <td class="n" id="sq2x2"></td>
262 <td class="n" id="sq3x2"></td>
264 <td class="n" id="sq4x2" onmousedown="down_click(4,2)"
265 onmouseup="up_click()"><img src="sym/WhiteLance.png"></td>
267 <td class="n" id="sq5x2" onmousedown="down_click(5,2)"
268 onmouseup="up_click()"><img src="sym/WhiteClaw.png"></td>
270 <td class="n" id="sq6x2" onmousedown="down_click(6,2)"
271 onmouseup="up_click()"><img src="sym/WhitePawn.png"></td>
273 <td class="n" id="sq7x2"></td>
275 <td class="n" id="sq8x2"></td>
277 <td class="n" id="sq9x2"></td>
281 <td class="n" id="sq0x1"></td>
283 <td class="n" id="sq1x1"></td>
285 <td class="n" id="sq2x1"></td>
287 <td class="n" id="sq3x1"></td>
289 <td class="n" id="sq4x1"></td>
291 <td class="n" id="sq5x1"></td>
293 <td class="n" id="sq6x1"></td>
295 <td class="n" id="sq7x1"></td>
297 <td class="n" id="sq8x1"></td>
299 <td class="n" id="sq9x1"></td>
303 <td class="n" id="sq0x0"></td>
305 <td class="n" id="sq1x0"></td>
307 <td class="n" id="sq2x0"></td>
309 <td class="n" id="sq3x0"></td>
311 <td class="n" id="sq4x0"></td>
313 <td class="n" id="sq5x0"></td>
315 <td class="n" id="sq6x0"></td>
317 <td class="n" id="sq7x0"></td>
319 <td class="n" id="sq8x0"></td>
321 <td class="n" id="sq9x0"></td>
325 <p id="piece" height="20">:<br>
330 <table cellpadding="5" border="1">
334 <td><b>Piece name</b></td>
338 <td><b>value</b></td>
340 <td><b>Moves</b> (<a href="Betza.html">Betza
343 <td><b>Remarks</b></td>
347 <td><img src="sym/WhiteKing.png"></td>
361 <td><img src="sym/WhiteLion.png"></td>
369 <td>KADN(cK-aK)(K-bK)</td>
371 <td>Can move twice per turn (as King)</td>
375 <td><img src="sym/WhiteQueen.png"></td>
389 <td><img src="sym/WhiteCrownedRook.png"></td>
391 <td>Dragon(-King)</td>
399 <td>Promotes to Eagle</td>
403 <td><img src="sym/WhiteCrownedBishop.png"></td>
405 <td>(Dragon-)Horse</td>
413 <td>Promotes to Unicorn</td>
417 <td><img src="sym/WhiteRook.png"></td>
427 <td>Promotes to Dragon</td>
431 <td><img src="sym/WhiteBishop.png"></td>
441 <td>Promotes to Horse</td>
445 <td><img src="sym/WhiteSword.png"></td>
447 <td>Vertical Mover</td>
455 <td>Promotes to Narrow Queen</td>
459 <td><img src="sym/WhiteHSword.png"></td>
469 <td>Promotes to Sleeping Queen</td>
473 <td><img src="sym/WhiteCanon.png"></td>
483 <td>Promotes to Whale</td>
487 <td><img src="sym/WhiteLance.png"></td>
497 <td>Promotes to White Horse</td>
501 <td><img src="sym/WhiteMarshall.png"></td>
511 <td>Promotes to Lion</td>
515 <td><img src="sym/WhiteArchbishop.png"></td>
525 <td>Promotes to Queen</td>
529 <td><img src="sym/WhiteElephant.png"></td>
539 <td><b>Promotes to a second King</b></td>
543 <td><img src="sym/WhiteClaw.png"></td>
553 <td>Promotes to Flying Stag</td>
557 <td><img src="sym/WhiteGold.png"></td>
567 <td>Promotes to Rook</td>
571 <td><img src="sym/WhiteAdvisor.png"></td>
581 <td>promotes to Vertical Mover</td>
585 <td><img src="sym/WhiteCommoner.png"></td>
595 <td>promotes to Side Mover</td>
599 <td><img src="sym/WhiteLeopard.png"></td>
601 <td>Ferocious Leopard</td>
609 <td>promotes to Bishop</td>
613 <td><img src="sym/WhiteCobra.png"></td>
623 <td>promotes to Elephant</td>
627 <td><img src="sym/WhitePawn.png"></td>
637 <td>promotes to Gold</td>
641 <td colspan="6"><b>Promoted pieces (not initially present)
647 <td><img src="sym/WhiteHawk.png"></td>
655 <td>RbBf(FA(cF-F)(mcF-bF))</td>
657 <td>Moves as Q, except for linear double-step 'stinging'
658 moves diagonally forward</td>
662 <td><img src="sym/WhiteUnicorn.png"></td>
670 <td>BsbRf(WD(cW-W)(mcW-bW))</td>
672 <td>(aka Horned Falcon) Moves as Q, except for linear
673 double-step 'stinging' forward</td>
677 <td><img src="sym/WhitePrincess.png"></td>
679 <td>Narrow Queen</td>
687 <td>aka Flying Ox</td>
691 <td><img src="sym/WhiteHCrown.png"></td>
693 <td>Sleeping Queen</td>
701 <td>aka Free Boar</td>
705 <td><img src="sym/WhiteChancellor.png"></td>
719 <td><img src="sym/WhiteKnight.png"></td>
733 <td><img src="sym/WhiteDolphin.png"></td>
747 <h3>Pawn peculiarities</h3>
750 <li>Pawns move <b>and capture</b> straight ahead.</li>
753 <h3>General rules</h3>
756 <li>The game is won by capturing the opponent's only King.</li>
758 <li>Pieces promote at the end of a move into the promotion
761 <li>The promotion zone consists of the last four ranks.</li>
763 <li>Pieces promote only once.</li>
765 <li>Perpetual checking is forbidden, and would be ruled a loss
766 on the 4-fold repeat.</li>
768 <li>Other repetitions lose for the side that creates them.</li>
771 <h3>Lion moves and Stinging pieces</h3>
773 <p>Some pieces can make two moves per turn. That means they can
774 also capture two pieces per turn, one on the square they move to
775 (as normal), and one 'en passant' on the transit square. They can
776 also capture on the transit square, and move on to an empty
777 square ('hit and run'), or capture and move back to where they
778 came from ('shooting' the piece from a distance, as it were). Of
779 course they can also capture a single piece in the normal Chess
780 manner. In that case the transit square is immaterial.</p>
782 <p>The Lion can make such double moves as two King steps, i.e. in
783 all directions, and arbitrarily changing direction between them.
784 The Unicorn and the Eagle can only make double moves in one or
785 two directions respectively. They can not arbitrarily change
786 direction, but only reverse it (or not), so they do stay on the
787 ray in that direction. But that way they can still make double,
788 hit-and-run, shooting or normal captures. All these pieces can
789 also jump over the transit square, i.e. reach the distant
790 two-step destination in a single jump. Finally they can also just
791 make a step to an adjacent square, refraining from taking a
794 <h3>Restrictions on Lion capture</h3>
796 <p>There are rules to make Lion trading very difficult, in order
797 to keep the Lions in play. Basically they specify that two Lions
798 cannot be captured in consecutive half-moves. When the first
799 capture is Lion x Lion from a distance, it is forbidden to play
800 it if recapture of the capturing Lion is possible. When another
801 piece captures a Lion, it is just the other way around: then the
802 'counterstrike' by a non-Lion against the Lion is forbidden. One
803 possibility left open is thus when you capture an adjacent Lion.
804 But then you would in general be foolish to allow recapture, as
805 you could take the Lion hit-and-run fashion, fleeing to a save
806 square. An exception to the rule is when a valuable opponent
807 piece (i.e. not a Pawn or Go Between) forms a 'bridge' between
808 the Lions; you may then capture that piece in the first leg of
809 the double-move, and then take the opponent Lion with the second
810 leg. Then the opponent can recapture, but he will have lost a
813 <h3>XBoard interface issues</h3>
815 <p>This game has to be played with the option Show Target Squares
816 on! This option will cause marking of the target squares of any
817 piece you select or grab, by the engine (with legality testing
818 off) or by XBoard (legality testing on). Moving to a square
819 marked in cyan will be interpreted not as the final destination,
820 but as the transit square after the first step of a multi-leg
821 move. XBoard will then highlight the possible destination squares
822 of the second leg from there. Should you want to end on the cyan
823 square, you click it again, (it will be no longer marked in
824 cyan), and XBoard will terminate the move after the first leg.
825 You can also move back to the starting square, to 'shoot' the
826 opponent piece from nearby.</p>
828 <p>With Detour Underpromotion on, XBoard will assume by default
829 that every piece that enters the zone promotes. Should you want
830 to defer in this mode, you should use a click-click move, and
831 when you make the click on the promotion square, move the mouse
832 down before releasing the button. If you move enough the piece on
833 the promotion square will change back to the unpromoted form, and
834 then you can release. With Detour Underpromotion off, you will
835 automatically get a promotion popup that asks whether you want to
836 promote or defer.</p>
838 <h3>Differences with FIDE</h3>
840 <p>Except that there are also Kings, Queens, Rooks and Bishops,
841 not much is the same.</p>
843 <h3>Strategy issues</h3>
845 <p>Piece with no sliding forward moves are hard to promote, but
846 promotion of forward sliders is practically unavoidable.</p>
848 <p>You can have two Kings by promoting the Elephant, in which
849 case the opponent would have to capture both in order to win.</p>
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