Chess puzzle (Equality)
Moves: 1. e4 Nc6 2. Nf3 f5 3. exf5 d5 4. Bd3 Nh6 5. Nh4 e5 6. g3 e4 7. Qh5+ Nf7 8. Bb5
Qf6 9. Nc3 Qd6 10. d3 exd3 11. cxd3 Bd7 12. Bf4 Qe7+ 13. Kd2 *
Position (FEN): r3kb1r/pppbqnpp/2n5/1B1p1P1Q/5B1N/2NP2P1/PP1K1P1P/R6R b kq - 4 13
Black to move.
Themes: Defensive Move Middlegame  Castling
Puzzle rating: 1949
Best move: O-O-O