Chess puzzle (Advantage)
Opening: Old_Indian_Defense, Old_Indian_Defense_Other_variations
Moves: 1. d4 d6 2. c4 Nf6 3. f3 e6 4. e4 c6 5. Bd3 Nbd7 6. Ne2 e5 7. d5 cxd5 8. cxd5
Nc5 9. b4 Nxd3+ 10. Qxd3 Be7 11. a4 a6 12. O-O Qb6+ 13. Be3 Qxb4 14. Nbc3 Bd7
15. Rab1 Qa5 16. Bb6 Bb5 17. Qxb5+ Qxb5 *
Position (FEN): r3k2r/1p2bppp/pB1p1n2/1q1Pp3/P3P3/2N2P2/4N1PP/1R3RK1 w kq - 0 18
White to move.
Themes:  Middlegame  
Puzzle rating: 1589
Best move: axb5