2 | You have a king and an antiking. King must stay away from checks, but antiking
3 | must always stay in check. Antiking captures his own kind.
8 li Chessboard: standard.
9 li Material: additional antiking.
10 li Non-capturing moves: standard.
11 li Special moves: standard.
12 li Captures: special case of antiking (see below).
13 li End of game: Checkmate or anti-checkmate.
18 | The additional piece is a royal figure, thus cannot be captured.
19 | It captures the pieces of his color (to help checkmate opponent antiking,
20 | but by doing so it also make standard checkmate more difficult...).
21 | It should always remains under check (if it cannot, game is over).
23 figure.diagram-container
25 | fen:rnbqkbnr/pppppppp/3A4/8/8/3a4/PPPPPPPP/RNBQKBNR c5,d5,e5:
26 figcaption Marked squares are not allowed antiking moves.
30 p There are two ways to win:
32 li Checkmate opponent king
33 li Anti-checkmate opponent antiking
34 p ...Or maybe do both at the same time?
36 p Note 1: athough antiking captures his color, it doesn't check his king.
39 | Note 2: since it would allow a basic tactic (keep antiking touching opponent's
40 | king), kings do not attack antikings.
42 p Note 3: an antiking does not check opponent's antiking.
47 a(href="https://www.chessvariants.com/diffobjective.dir/anti-king-chess.html")
49 | on chessvariants.com.