Chess puzzle (Crushing)
Opening: English_Opening, English_Opening_Mikenas-Carls_Variation
Moves: 1. c4 Nf6 2. Nc3 e6 3. e4 Bb4 4. d3 b6 5. g3 Bb7 6. Bg2 e5 7. Be3 O-O 8. Qf3
Bxc3+ 9. bxc3 Nc6 10. Ne2 d6 11. O-O Bc8 12. a4 *
Position (FEN): r1bq1rk1/p1p2ppp/1pnp1n2/4p3/P1P1P3/2PPBQP1/4NPBP/R4RK1 b - - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1264
Best move: Bg4