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+p.boxed.
+ You have a king and an antiking. King cannot be let in check, but antiking
+ must always stay under check. Antiking captures his own kind.
+
+p.
+ A new piece is introduced: the antiking, noted by the letter 'A'.
+ This piece must always remain under (orthodox) check: it is
+ considered in (anti-)check when not attacked by any enemy piece. In such a
+ situation, the antiking must move immediately to an attacked square.
+
+p.
+ The antiking is a royal figure, and thus cannot be captured.
+ It captures only the pieces of his color.
+ Antikings don't give check, and kings do not attack antikings.
+
+figure.diagram-container
+ .diagram
+ | fen:2prbkqA/2p1nnbr/2pppppp/8/8/PPPPPP2/RBNN1P2/aQKBRP2:
+ figcaption Initial setup: antikings stand in the corners.
+
+h3 Unusual moves
+
+ul
+ li.
+ Pawns are Berolina Pawns, which move diagonally forward one square
+ without capturing, or move one square straight forward to capture.
+ li.
+ If a King or Anti-King has not yet moved, it may make as its first
+ move a Knight's leap to an empty square.
+
+h3 End of the game
+
+p There are three ways to win:
+ol
+ li Checkmate opponent king
+ li Anti-checkmate opponent antiking
+ li Give a double check, as on the following diagram
+
+figure.diagram-container
+ .diagram
+ | fen:2pr3A/2pb1qbr/2p1pkQp/2pnp1n1/1PPN4/PPB1PPN1/1K2RP2/a2BRP2:
+ figcaption After Qb1xg6#
+
+h3 More information
+
+p
+ a(href="https://www.chessvariants.com/diffobjective.dir/anti-king-chess.html")
+ | Antiking chess
+ | on chessvariants.com.
+
+p Inventor: Peter Aronson (2002)