Chess puzzle (Advantage)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Bd3 Nc6 7. Nge2 Bd7 8. O-O
a6 9. Be3 Na7 10. Qd2 c5 11. d5 Qb6 12. Rab1 Qc7 13. Bh6 Bxh6 14. Qxh6 b5 15.
b3 e6 16. g4 exd5 17. cxd5 c4 18. bxc4 bxc4 19. Bc2 Nb5 20. Nxb5 *
Position (FEN): r4rk1/2qb1p1p/p2p1npQ/1N1P4/2p1P1P1/5P2/P1B1N2P/1R3RK1 b - - 0 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1690
Best move: axb5