Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Lowenthal_Variation
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb3 Bb4+ 6. Bd2 a5 7. Nc3 a4 8.
Nc1 Nf6 9. Bd3 a3 10. b3 O-O 11. O-O Qa5 12. N1e2 d6 13. h3 Be6 14. f4 exf4 15.
Rxf4 Rac8 16. Qe1 Ne5 17. Rd1 Rc7 18. Rxf6 gxf6 19. Nd5 Bxd5 *
Position (FEN): 5rk1/1pr2p1p/3p1p2/q2bn3/1b2P3/pP1B3P/P1PBN1P1/3RQ1K1 w - - 0 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1758
Best move: Bxb4