Chess: THE PIN

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Bishop pin. In the diagram above, the White Bishop is pinning the Black Knight. If the Knight moves, the Queen will be captured. At the same time, the Black Bishop is pinning the White Knight. However, this time the Knight is not allowed to move, because doing so would put the King in check.


Rook pin. In the diagram above, the Black Knight is pinned against the King. The Knight is unable to move because if it does it would expose the King to check. If an enemy piece is pinned by one of your pieces, attack it with another of your pieces. White moves her pawn to d3 and the Knight is lost!