More efficient Synchrone chess + fix a bug. FIrst draft of Apocalypse
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1 p.boxed
2 | Both players play a move "at the same time".
3 | The goal is to eliminate all pawns.
4
5 p
6 | This variant is inspired by the
7 a(href="https://en.wikipedia.org/wiki/Four_Horsemen_of_the_Apocalypse")
8 |  Four Horsemen of the Apocalypse
9 | mythology. Knights are horsemen, and pawns are footmen.
10 | The goal is to eliminate all enemy footmen,
11 | most likely with the help of your horsemen.
12 | If all footmen die, the other side wins.
13
14 p.
15 At each turn you can decide either to play safely an apparently valid move,
16 or speculate on your opponent's move and choose a move valid only
17 conditionally on his choice. In this last case the move may end up not
18 being playable: you would get a penalty point. Two penalty points loses
19 the game. For example in the initial position, 1.(c1)c2 is safe while 1.axb3
20 will be valid only if black plays 1...Nb3.
21
22 p Resolving rules:
23 ul
24 li.
25 If both moves are illegal none are played.
26 If one is illegal, the other is played.
27 li.
28 If both moves arrive on the same square, both pieces disappear except
29 if one is a horseman and the other a footman.
30 In this case only the horseman remains.
31 li.
32 If a capture was intended but the target moved, the move is still played
33 but doesn't capture anything.
34
35 figure.diagram-container
36 .diagram
37 | fen:npppn/p4/4P/P2pP/NPP1N:
38 figcaption After 1.d1d2 e4e3 2.dxe3 exd2, pawns placements are inversed.
39
40 h3 Pawn promotions
41
42 p.
43 Pawns automatically promote in a knight, except if the player already
44 have two horsemen on the board. In this case the footman is relocated on
45 any free square which is not on last rank.
46
47 h3 End of the game
48
49 p.
50 As stated previously, losing all pawns lose the game, so promoting your
51 last pawn loses. It may be the only legal move.
52 If however both footmen armies vanish at the same time, it's a draw.
53 It can happen if the two last pawns decide to advance to the same square.
54
55 h3 Source
56
57 p
58 a(href="https://www.chessvariants.com/rules/apocalypse") Apocalypse chess
59 |  on chessvariants.com. This variant is playable at
60 a(href="http://apocalypsechess.online/") apocalypsechess.online
61 |  but without the promotion restriction.
62
63 p Inventor: C.S. Elliott (1976)