Chess puzzle (Advantage)
Moves: 1. e4 c5 2. c3 Nc6 3. d4 e6 4. Nf3 Nf6 5. Bd3 b6 6. Nbd2 Bb7 7. O-O Be7 8. b3
O-O 9. Ba3 cxd4 10. Bxe7 Qxe7 11. cxd4 Nb4 12. Nc4 Nxd3 13. Qxd3 Bxe4 14. Qe3
Bb7 15. Rfe1 Nd5 16. Qd2 b5 17. Nce5 f6 18. Nd3 a5 19. a4 b4 20. Nc5 Ba6 21.
Rac1 Rfc8 *
Position (FEN): r1r3k1/3pq1pp/b3pp2/p1Nn4/Pp1P4/1P3N2/3Q1PPP/2R1R1K1 w - - 4 22
White to move.
Themes:  Middlegame  
Puzzle rating: 1180
Best move: Nxa6