Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Zukertort_Variation
Moves: 1. d4 d5 2. Nf3 Bf5 3. e3 Nc6 4. Nbd2 Nf6 5. a3 e6 6. b4 a6 7. Bb2 Bd6 8. c4
dxc4 9. Nxc4 O-O 10. Nxd6 cxd6 11. Rc1 Bg4 12. Be2 Nd5 13. O-O Qf6 14. e4 Nf4
15. e5 Nxe2+ 16. Qxe2 dxe5 17. dxe5 Qg6 18. Qe3 Bh3 *
Position (FEN): r4rk1/1p3ppp/p1n1p1q1/4P3/1P6/P3QN1b/1B3PPP/2R2RK1 w - - 3 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1389
Best move: Nh4