Chess puzzle (Advantage)
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Bg5 Bb4 7. Nxc6 Bxc3+
8. bxc3 bxc6 9. e5 h6 10. exf6 hxg5 11. fxg7 Rg8 12. Qh5 Qf6 13. Qh3 Qxg7 14.
Be2 d5 15. O-O Bd7 16. Rab1 f5 17. Rb7 Rh8 18. Qe3 Qh6 19. h3 Qh4 20. f3 a5 21.
Qe5 Qh6 22. Re1 Rg8 23. Bd1 Qg7 24. Qxf5 *
Position (FEN): r3k1r1/1R1b2q1/2p1p3/p2p1Qp1/8/2P2P1P/P1P3P1/3BR1K1 b q - 0 24
Black to move.
Themes:  Middlegame  Castling
Puzzle rating: 2211
Best move: O-O-O