Chess puzzle (Advantage)
Moves: 1. e4 c5 2. Nf3 d6 3. Bb5+ Nc6 4. Bxc6+ bxc6 5. O-O g6 6. c4 Bg7 7. Qa4 Bd7 8.
Qd1 Rb8 9. d4 cxd4 10. Nxd4 Qb6 11. Nb3 a5 12. Nc3 c5 13. Be3 a4 14. Nd2 Qxb2
15. Nb5 Bxb5 16. cxb5 Qxb5 17. Rb1 Bb2 18. Qc2 a3 19. Nc4 Nf6 20. Nxb2 *
Position (FEN): 1r2k2r/4pp1p/3p1np1/1qp5/4P3/p3B3/PNQ2PPP/1R3RK1 b k - 0 20
Black to move.
Themes: Advanced Pawn Middlegame  
Puzzle rating: 1191
Best move: axb2