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Chess Opening Theory/1. Nf3/1...f5/2. g3
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Dutch Defence
2. g3
This is a principled move similar to the King's Indian Attack that allows White to fianchetto a bishop next move. Black's most popular response is /2...Nf6/ followed by 3...g6 3...d6, or 3...e6 to protect the f-pawn but Black could also prepare 3...e5 with /2...d6/ to take the center.