Chess puzzle (Crushing)
Opening: Ruy_Lopez, Ruy_Lopez_Bird_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4 exd4 5. c3 Qg5 6. Be2 d3 7. Bf3 d5 8.
O-O Bd6 9. exd5 Nf6 10. Re1+ Kf8 11. b3 Qh4 12. g3 Qh3 13. Bg2 Qh6 14. Ba3 Ng4
15. h3 Nf6 16. Bxd6+ cxd6 17. Re3 Bxh3 18. Bxh3 Qxh3 19. Rxd3 *
Position (FEN): r4k1r/pp3ppp/3p1n2/3P4/8/1PPR2Pq/P2P1P2/RN1Q2K1 b - - 0 19
Black to move.
Themes:  Middlegame  
Puzzle rating: 1035
Best move: Ng4