Chess puzzle (Advantage)
Opening: Philidor_Defense, Philidor_Defense_Exchange_Variation
Moves: 1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 c5 5. Nb5 a6 6. N5c3 h6 7. Bf4 Be7 8. e5
dxe5 9. Qxd8+ Bxd8 10. Bxe5 Nf6 11. Bc4 O-O 12. Nd2 Nc6 13. Bxf6 Re8+ 14. Nde4
Bxf6 15. O-O Bxc3 16. Nxc3 b5 17. Bxb5 *
Position (FEN): r1b1r1k1/5pp1/p1n4p/1Bp5/8/2N5/PPP2PPP/R4RK1 b - - 0 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1028
Best move: axb5