411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...g6/2. d4/2...f5
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Fianchetto gambit B06 Modern Defence
2...f5? · Fianchetto gambit
A very bad gambit. Instead of developing their kingside bishop to g7, Black challenges White's center with f5, weakening the kingside significantly.
3. exf5 punishes this risky gambit. It turns out that the g-pawn doesn't defend f5 at all, as 3...gxf5?? 4. Qh5# is most embarrassing. Instead, Black will have to settle for a weakened kingside after 3...d5 4. Bd3.
This can also be reached from the Staunton Gambit through 1. d4 f5 2. e4 g6?.
Theory table
0 3. exf5 d5 4. Bd3 Qd6 5. Nc3 gxf5 ++ Fianchetto gambit 3. ... gxf5?? 4. Qh5# 1-0
References