The Légal Trap or Blackburne Trap (also known as Légal Pseudo-Sacrifice and Légal Mate) is a chess opening trap, characterized by a queen sacrifice followed by checkmate with minor pieces if Black accepts the sacrifice. The trap is named after the French player Sire de Légal (1702–92). Joseph Henry Blackburne (1841–1924), a British master and one of the world's top five players in the latter part of the 19th century, set the trap on many occasions.
The original game featured Légal playing at rook odds (without Ra1)] against Saint Brie in Paris 1750:
1. e4 e5 2. Nf3 d6 3. Bc4 Bg4?! 4. Nc3 g6? 5. Nxe5 Bxd1?? 6. Bxf7+ Ke7 7. Nd5# 1–0
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