Chess puzzle (Advantage)
Moves: 1. Nf3 Nc6 2. b3 g6 3. Bb2 Nf6 4. g4 Bg7 5. g5 Nh5 6. Bxg7 Nxg7 7. Nc3 d5 8. d3
e5 9. Qd2 d4 10. Ne4 Bf5 11. Nf6+ Ke7 12. Bg2 Qd6 13. O-O-O Qa3+ 14. Kb1 Nb4
15. c3 dxc3 16. Qxc3 Qxa2+ 17. Kc1 Qa5 18. Nd5+ Qxd5 19. Qxb4+ c5 20. Qc3 Ne6 *
Position (FEN): r6r/pp2kp1p/4n1p1/2pqpbP1/8/1PQP1N2/4PPBP/2KR3R w - - 2 21
White to move.
Themes:  Middlegame  
Puzzle rating: 1881
Best move: e4