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En prise (from French "can be taken") [1] describes a piece or pawn exposed to a material winning capture by the opponent. This is either a hanging piece, a not defended pawn [2] , a piece attacked by a lower valuable attacker, or a piece or pawn defended insufficiently. Any least valuable attacker (LVA) would gain a positive score from a static exchange evaluator on the target square, which also applies to a knight defended by a pawn and attacked by bishop and rook, where the majority of attackers and a least valuable attacker of similar value makes the knight en prise.

With pins, overloading, and other tactical motives in mind, whether keeping or putting a piece en prise is a blunder or a sacrifice is a matter of search, the latter may require some depth left to differentiate.

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References

  1. ^ Earliest Occurrences of Chess Terms by Edward Winter
  2. ^ The ambiguous term hanging pawns refers a duo of open and half-isolated pawns

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