| 1 | p.boxed. |
| 2 | You have a king and an antiking. King cannot be let in check, but antiking |
| 3 | must always stay under check. Antiking captures his own kind. |
| 4 | |
| 5 | p. |
| 6 | A new piece is introduced: the antiking, noted by the letter 'A' in diagrams |
| 7 | and PGNs. This piece must always remain under (orthodox) check: it is |
| 8 | considered in (anti-)check when not attacked by any enemy piece. In such a |
| 9 | situation, the antiking must move immediately to an attacked square. |
| 10 | |
| 11 | p. |
| 12 | The antiking is a royal figure, and thus cannot be captured. |
| 13 | It captures only the pieces of his color (to help checkmating the opponent's |
| 14 | antiking, but this also complicates standard checkmate). |
| 15 | |
| 16 | figure.diagram-container |
| 17 | .diagram |
| 18 | | fen:rnbqkbnr/pppppppp/3A4/8/8/3a4/PPPPPPPP/RNBQKBNR c5,d5,e5: |
| 19 | figcaption Marked squares are not allowed antiking moves. |
| 20 | |
| 21 | ul |
| 22 | li. |
| 23 | Although antiking captures his color, it doesn't check his king - it |
| 24 | doesn't check the opponent's king either. |
| 25 | li. |
| 26 | Since it would allow a basic tactic (keep antiking touching opponent's |
| 27 | king), kings do not attack antikings. |
| 28 | |
| 29 | h3 End of the game |
| 30 | |
| 31 | p There are two ways to win: |
| 32 | ol |
| 33 | li Checkmate opponent king |
| 34 | li Anti-checkmate opponent antiking |
| 35 | p. |
| 36 | ...Or do both at the same time, as on the following diagram after 3.Qxf7# |
| 37 | (the black antiking was on g3). |
| 38 | |
| 39 | figure.diagram-container |
| 40 | .diagram |
| 41 | | fen:rnbqkbnr/pppp1Qpp/1A6/4p3/4P2a/8/PPPP1PPP/RNB1KBNR h4,e8: |
| 42 | figcaption After 1.e4 e5 2.Qh5 Ah4?? 3.Qxf7# |
| 43 | |
| 44 | h3 More information |
| 45 | |
| 46 | p |
| 47 | a(href="https://www.chessvariants.com/diffobjective.dir/anti-king-chess.html") |
| 48 | | Antiking chess |
| 49 | | on chessvariants.com. |