Mortimer Trap

Retreat a developed knight on purpose; when White snatches the pawn, one pawn move wins a piece.

Ruy Lopez, Berlin Defence — White falls in with Nxe5

Trap data: Wikipedia — Ruy Lopez, Mortimer Trap (CC BY-SA 4.0); Lichess chess-openings (Ruy Lopez: Berlin Defense, Mortimer Trap, ECO C65) (CC0-1.0).