Queen Sac Wins

Légal Trap, Blackburne Trap, or also known as the 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 Sire de Légal (1702-1792) who was a French player, or Joseph Henry Blackburne (1841-1924), who was a British master and one of the world's strongest players in the latter part of the 19th century.

In general, any game having a knight on e5 and ending with the moves Bxf7+ Ke7 Nd5# would be called a Légal Mate. Making a "trap" by luring a bishop on g4 or h5 into a queen capture on d1 is not strictly necessary. In order for the last move to be checkmate, it is of course necessary that black have pieces on squares d6, d8, and f8, and that black have no pieces attacking the square d5.