Chess puzzle (Advantage)
Moves: 1. d4 Nf6 2. c4 e6 3. e3 c6 4. Nc3 d5 5. Nf3 Be7 6. Bd3 O-O 7. O-O Nbd7 8. a3
c5 9. dxc5 Nxc5 10. cxd5 Nxd3 11. Qxd3 Nxd5 12. Nxd5 exd5 13. b4 Bf6 14. Ra2
Be6 15. Nd4 Qb6 16. Bb2 Rac8 17. Nxe6 Qxe6 18. Bd4 Rfd8 19. Rd2 Rc7 20. Bxa7 *
Position (FEN): 3r2k1/Bpr2ppp/4qb2/3p4/1P6/P2QP3/3R1PPP/5RK1 b - - 0 20
Black to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 1726
Best move: b6