A pin is a tactic that restricts an enemy piece by forcing it to stay on its square in order to protect a more valuable piece or square behind it, under threat of material loss.
A pin is created by a long-range piece — a rook, bishop, or queen — that lines up on the same rank, file, or diagonal as two enemy pieces. The "pinned" piece cannot or should not move, because doing so would expose something more valuable behind it. There are two types: an absolute pin, where the pinned piece cannot legally move because it would expose the king to check, and a relative pin, where it should not move because the resulting material loss would be too costly.
In practice, a pin often gains time and creates additional threats. Whenever one of your long-range pieces aligns with an enemy piece and a valuable target behind it, exploit the pin by attacking the pinned piece with additional pieces or pawns. The opponent will struggle to defend effectively.
Frequently asked questions
- What is the difference between an absolute pin and a relative pin?
- In an absolute pin, the pinned piece cannot legally move because doing so would expose the king to check. In a relative pin, the piece could technically move, but it would result in losing a more valuable piece behind it.
- How do you break a pin on your knight from an enemy bishop?
- You can interpose a piece between the bishop and your knight, capture the pinning bishop, advance a pawn to drive it away, or move your king if it is an absolute pin. The key is to act before your opponent piles more pressure onto the pinned piece.
- Can a pinned piece still defend?
- Yes, a pinned piece can still defend adjacent squares and pieces even if it cannot move. However, its defensive effectiveness is reduced, and the opponent can exploit this by attacking what it is supposed to protect.
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