Chess puzzle (Advantage)
Moves: 1. f4 Nf6 2. Nf3 g6 3. b4 Bg7 4. Bb2 O-O 5. e3 d5 6. Be2 a6 7. a4 Nc6 8. b5
axb5 9. axb5 Rxa1 10. Bxa1 Na7 11. Na3 Bd7 12. Bd4 b6 13. O-O Ne8 14. Bxg7 Kxg7
15. Qa1+ f6 16. c4 Nd6 17. cxd5 Naxb5 18. Rb1 Nxa3 19. Qxa3 Qa8 20. Qxa8 Rxa8
21. Rc1 Ra7 22. Nd4 f5 23. Bf3 Ne8 24. Kf2 Ra2 25. Ke2 Bc8 26. Nb5 *
Position (FEN): 2b1n3/2p1p1kp/1p4p1/1N1P1p2/5P2/4PB2/r2PK1PP/2R5 b - - 7 26
Black to move.
Themes: Pin Endgame  
Puzzle rating: 888
Best move: Ba6