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Bluegill, In this varint of chess, the opponent has the choice to either accept the move, or request the first player makes an alternative move.
This is another interesting variant.
(Cacher) Si vous attendez que ce soit à vous de jouer, cliquez sur "changer" à côté du "rafraîchissement" sur la page principale, puis réglez le rafraîchissement de la page sur 30 secondes pour que votre tour de jouer apparaisse pplus vite. (Servant) (Montrer toutes les astuces)