411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Bc5/3. Nxe5/3...f6
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Busch-Gass gambit C40 Busch-Gass gambit
3...f6?
This move, seemingly attacking the knight, allows White to win with 4. Qh5+! because it allows 4...g6 5. Nxg6! hxg6 6. Qxh8 when White is up material. Other legal moves instead of 4...g6 would lead to checkmate.
For example:
4...Ke7?? leads to:
5. Qf7+! Kd6 6. Nc4+ Kc6 7. Qd5+ Kb5 8. Ne5+ Ka4 9. Qc4+ Bb4 10. Qb5#
4...Kf8?? simply leads to a checkmate in one, with 5. Qf7#.
References