Improve Bario rules description about castling
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1 p.boxed
2 | Both players play a move "at the same time".
3 | The goal is to eliminate all enemy pawns.
4
5 figure.diagram-container
6 .diagram
7 | fen:npppn/p3p/5/P3P/NPPPN:
8 figcaption Initial position.
9
10 p
11 | This variant is inspired by the
12 a(href="https://en.wikipedia.org/wiki/Four_Horsemen_of_the_Apocalypse")
13 | Four Horsemen of the Apocalypse
14 |  mythology. Knights are horsemen, and pawns are footmen.
15 | If all footmen of one color die, the other side wins.
16
17 p.
18 At each turn you can decide either to play safely an apparently valid move,
19 or speculate on your opponent's move and choose a move valid only
20 conditionally on his choice. In this last case the move may end up not
21 being playable: you would get a penalty point. Two penalty points loses
22 the game. For example in the initial position, 1.(c1)c2 is safe while 1.axb3
23 will be valid only if black plays 1...Nb3.
24
25 p Resolving rules:
26 ul
27 li.
28 If both moves are illegal none are played.
29 If one is illegal, the other is played.
30 li.
31 If a capture is intended but the target moved, the move is still played
32 but doesn't capture anything.
33 li.
34 If both moves arrive on the same square: the illegal move prevails,
35 if the other was legal (higher risk => reward): the other piece vanish.
36 If both moves are (il)legal, then a horseman wins over a footman.
37 Finally, at same risk level and same piece type, both disappear.
38
39 figure.diagram-container
40 .diagram
41 | fen:npppn/p4/4P/P2pP/NPP1N:
42 figcaption After 1.d1d2 e4e3 2.dxe3 exd2, pawns placements are inversed.
43
44 h3 Promotions
45
46 p.
47 Pawns automatically promote in a knight, except if the player already
48 have two horsemen on the board. In this case the footman is relocated on
49 any free square which is not on last rank.
50 Even in this last case, pawn promotions may appear possible by
51 anticipation of a knight capture. This is risky but playable.
52
53 h3 End of the game
54
55 p.
56 As stated previously, losing all pawns lose the game, so promoting your
57 last pawn loses. It may be the only legal move.
58 If however both footmen armies vanish at the same time, it's a draw.
59 It can happen if the two last pawns decide to advance to the same square
60 for example.
61 Finally, if both sides get the second penalty point at the same time
62 it's also a draw.
63
64 h3 Source
65
66 p
67 a(href="https://www.chessvariants.com/rules/apocalypse") Apocalypse chess
68 |  on chessvariants.com. This variant is playable at
69 a(href="http://apocalypsechess.online/") apocalypsechess.online
70 |  but without the promotion restriction.
71
72 p Inventor: C.S. Elliott (1976)