Threat

A threat states what a player intends to do next if the opponent takes no preventive action. It may announce mate, an attack on the king with no legal defense, a favorable capture, pawn promotion upon reaching the last rank and becoming another piece, a fork in which one piece attacks several targets, or the trapping of a piece. To be real, it needs a concrete consequence and a continuation that works against reasonable replies.

Concrete future threat

The Jump That Cannot Be Ignored

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Nxc7+

Nxc7+ threatens two targets at once: the king on e8 and the rook on a8.

The Concrete Threat Is Nxc7+

Black is to move and is not in check. Without prevention, the knight will jump to c7 with check and also attack the rook on a8. Moving the king or the rook can prevent the double consequence.

1. Nxc7+ threatens two targets at once: the king on e8 and the rook on a8.

Attack and threat are not identical. In the formal rules sense, a piece attacks a square when, according to its movement, it would capture an opposing piece placed there, even if it cannot actually make that capture because doing so would leave its own king in check; the attack may still be harmless because the target is adequately defended. A threat instead means that allowing the idea causes meaningful damage. Check is a special case: it attacks the king now and requires an immediate response, while other threats may be ignored legally, although usually unwisely.

Attack without an effective threat

Attacked, but Not Lost

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The white bishop attacks c6, and the black bishop defends that same square.

A Defended Attack Does Not Force a Loss

The bishop on b5 attacks the knight on c6, but the bishop on d7 controls the same square. Bxc6 Bxc6 trades a bishop for a knight and keeps the material equivalent, so there is no forced loss.

1. The white bishop attacks c6, and the black bishop defends that same square.

Strong threats restrict choices and help preserve the initiative, the ability to pose problems that require answers. A defender may prevent the idea, move the target, exchange the attacker, or create more urgent counterplay, a threat of their own that demands attention. In tactical play, concrete short-range play, naming the exact threat prevents defending the wrong thing.