Chess puzzle (Equality)
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Nf6 6. Be2 g6 7. Be3 Bg7 8.
Qd2 O-O 9. O-O-O d6 10. h4 Ne5 11. f3 Nh5 12. f4 Ng4 13. Bxg4 *
Position (FEN): r1bq1rk1/1p2ppbp/p2p2p1/7n/3NPPBP/2N1B3/PPPQ2P1/2KR3R b - - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1470
Best move: Bxg4