Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Najdorf_Variation
Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e5 7. Nb3 Be7 8. Bg5
Be6 9. Bxf6 Bxf6 10. Nd5 Bxd5 11. Qxd5 Qc7 12. O-O-O Be7 13. Na5 Nc6 14. Nc4
O-O 15. a3 b5 16. Ne3 Rac8 17. c3 b4 18. axb4 Nxb4 19. Qb3 Bg5 *
Position (FEN): 2r2rk1/2q2ppp/p2p4/4p1b1/1n2P3/1QP1N2P/1P3PP1/2KR1B1R w - - 2 20
White to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1354
Best move: Qxb4