This taking en-passant must be done directly: if the player who could take en-passant does not do this in the first move after the double step, this pawn cannot be taken anymore by an en-passant move.

• 这种走顺道必须直接做：如果能够走顺道的那一方在对方的两步后第一次移动时没有进行顺道，那么这个兵就不能在顺道时被吃掉了。