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This opening is a little-known but strong response to 1.h4. After 2. h5 a4 3. h6 a3 4. hxg7 Bxg7 Black puts pressure on White's queenside.

Kádas Opening: Koola-Koola Variation
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

White has many decent replies.

• 2.h5 this move is a mistake
• 2.a4 a strong move that blocks the advance of the a-pawn. after 2...h5 an equal position arises
• 2.g3 An interesting move, preparing the bishop's exit to g2.

No statistics as 1. h4 a5 is rarely played.