Chess variants on a 10x10 board, in particular Grand Chess.
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Chess Variant Pages has a listing for "Amazon-Grand Chess" which adds an Amazon (combined Q & N) to each side of a standard grandchess array, placed behind each Queen; White's on d1, Black's on d10. No mention of it ever having been tested, but it would almost certainly enhance the tactical play.
Also, I'd like to suggest applying the ice chess concept to the grandchess board. This could produce interesting strategic games.
(ocultar) Si deseas jugar una partida contra un adversario de nivel similar, puedes definir en tu invitación de nueva partida un rango BKR apropiado a tu interés. En tal caso, nadie con un BKR fuera de dicho rango podrá ver o aceptar la invitación. (Katechka) (mostrar todos los consejos)