Chess puzzle (Advantage)
Moves: 1. d4 d6 2. c4 Nf6 3. Nc3 Nbd7 4. Nf3 e5 5. d5 Be7 6. Bg5 c6 7. e4 Qa5 8. Be2
Nxe4 9. Bxe7 Kxe7 10. Qc1 Rd8 11. O-O Nxc3 12. bxc3 h6 13. Re1 Kf8 14. Nh4 Nf6
15. Bd3 cxd5 16. cxd5 Qxd5 17. Rd1 Qc6 18. h3 d5 19. f3 Be6 20. Nf5 e4 *
Position (FEN): r2r1k2/pp3pp1/2q1bn1p/3p1N2/4p3/2PB1P1P/P5P1/R1QR2K1 w - - 0 21
White to move.
Themes:  Middlegame  
Puzzle rating: 1194
Best move: Qa3+