Chess puzzle (Crushing)
Opening: Pirc_Defense, Pirc_Defense_Other_variations
Moves: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f3 Bg7 5. Be3 O-O 6. Qd2 c6 7. O-O-O b5 8. a3
a5 9. Kb1 b4 10. axb4 *
Position (FEN): rnbq1rk1/4ppbp/2pp1np1/p7/1P1PP3/2N1BP2/1PPQ2PP/1K1R1BNR b - - 0 10
Black to move.
Themes:  Opening  
Puzzle rating: 888
Best move: axb4