Chess Opening Theory/1. d4/1...f5/2.h4/2...Nf6/3.h5/3...h6

Dutch Defense: Beaver claw Declined

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3...h6

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This move is a mistake. The white squares on the black kingside are weakened. White gets a good square g6 for his knight.

Dutch Defence
a b c d e f g h
8                 8
7                 7
6                 6
5                 5
4                 4
3                 3
2                 2
1                 1
a b c d e f g h