411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...f5/2. Bg5/2...h6/3. Bh4
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Dutch Defence with 2.Bg5 rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pd pl bl pl pl pl pl pl pl pl rl nl
ql kl bl nl rl 1.d4 f5 2. Bg5 h6 3.Bh4 A80 Dutch Defence
This retreat appears to lose the bishop, but it doesn't! If 3...g5 4.Bg3 f4?!, 5.e3! h5 6.Bd3! gives a crushing attack.
Theory table
g5 f4?!
4.Bg3 5.e3