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The 4.b4 gambit: don't leave f7 alone
4.b4: 57 games in the file, 48%. You take the pawn, and that's correct. The game is decided on move 8, when the Bc4 and a knight on g5 aim at f7.
Recall: after 6.Bxf3 in the 3.Nf3 Bg4 line, which move do you play?