Fianchetto Gambit

The Fianchetto Gambit replaces the usual 2...Bg7 with 2...f5, striking at e4 before the bishop is developed. The flaw is that the g6-pawn cannot recapture on f5: after 3. exf5 gxf5 4. Qh5 is mate, so Black usually continues 3...d5 4. Bd3 with a loosened king position. 3. e5 and 3. Nc3 are also common. Engines give White a large advantage, and White wins most games in practice. The position can also arise from the Staunton Gambit move order 1. d4 f5 2. e4 g6.