Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. O-O a6 5. Ba4 Nd4 6. Nxe5 c5 7. c3 Ndc6 8.
Nxc6 Nxc6 9. d4 b5 10. Bb3 cxd4 11. cxd4 Bb4 12. d5 Ne5 13. Qd4 Bd6 14. f4 Nc4
15. Qxg7 Rf8 16. Bxc4 bxc4 17. Nc3 Bb7 18. e5 Bb4 19. d6 Qb6+ 20. Kh1 *
Position (FEN): r3kr2/1b1p1pQp/pq1P4/4P3/1bp2P2/2N5/PP4PP/R1B2R1K b q - 2 20
Black to move.
Themes: Defensive Move Middlegame  Castling
Puzzle rating: 1504
Best move: O-O-O