Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 h6 4. Nc3 Nf6 5. d3 a6 6. a3 b5 7. Ba2 Bb7 8. b4 Bd6
9. Bb2 Nd4 10. Nxd4 exd4 11. Ne2 O-O 12. Nxd4 Be5 13. Qf3 d6 14. O-O-O c5 15.
bxc5 dxc5 16. Nf5 Bxb2+ 17. Kxb2 h5 18. c3 b4 19. axb4 cxb4 20. cxb4 Qb6 21.
Ka3 *
Position (FEN): r4rk1/1b3pp1/pq3n2/5N1p/1P2P3/K2P1Q2/B4PPP/3R3R b - - 2 21
Black to move.
Themes:  Middlegame  
Puzzle rating: 1252
Best move: a5