Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Closed
Moves: 1. e4 c5 2. Nc3 d6 3. Bb5+ Bd7 4. Bxd7+ Nxd7 5. d4 cxd4 6. Qxd4 Ngf6 7. Bg5 Ng8
8. Nf3 h6 9. Be3 Ngf6 10. O-O-O Qc7 11. Nb5 Qc6 12. Nxa7 Qa6 13. a3 Rxa7 *
Position (FEN): 4kb1r/rp1nppp1/q2p1n1p/8/3QP3/P3BN2/1PP2PPP/2KR3R w k - 0 14
White to move.
Themes:  Middlegame  
Puzzle rating: 806
Best move: Qxa7