La Bourdonnais Gambit

The La Bourdonnais Gambit arises when White meets the early queen sortie 2...Qf6 and 3...Qg6, which eyes g2 and e4, by castling and leaving the e4-pawn en prise. Accepting with 4...Qxe4 is the most frequent reply but scores poorly. The queen becomes a target on the e-file: 5. Nxe5 Qxe5 6. Re1 or 5. d4 exd4 6. Re1 wins it, and 5. Bxf7+ is also strong. The quieter 4...d6 is sounder, though the engine still gives White a clear advantage.