Budapest Defence: f4??

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"The greedy 4.f4 is weak because White neglects his development and weakens the a7–g1 diagonal. Black can immediately exploit this with 4...Bc5, which threatens a fork on f2 and forbids White's castling; Black may later push d7–d6 to open the centre, e.g. 5.Nh3 O-O 6.Nc3 d6 7.exd6 cxd6 when Black has good squares for its pieces while White's castling is delayed." - Wikipedia