The pin
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A pin freezes a piece: if it stands between an attacker and its own king, moving it is illegal. From b5 your bishop will aim straight at the knight, with the king right behind.
Step 1 of 3
A pin freezes a piece: if it stands between an attacker and its own king, moving it is illegal. From b5 your bishop will aim straight at the knight, with the king right behind.