Chess puzzle (Advantage)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Exchange_Variation
Moves: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Nc3 Nf6 5. Bg5 Bg4 6. f3 Bh5 7. Nge2 h6 8.
Bxf6 exf6 9. g4 Bg6 10. h4 Bb4 11. Qd2 Nc6 12. a3 Ba5 13. O-O-O O-O 14. b4 *
Position (FEN): r2q1rk1/pp3pp1/2n2pbp/b2p4/1P1P2PP/P1N2P2/2PQN3/2KR1B1R b - - 0 14
Black to move.
Themes:  Middlegame  
Puzzle rating: 1055
Best move: Nxb4