Chess puzzle (Advantage)
Opening: Philidor_Defense, Philidor_Defense_Other_variations
Moves: 1. e4 e5 2. Nf3 d6 3. h3 Nf6 4. Nc3 c6 5. Bc4 d5 6. exd5 e4 7. Ne5 cxd5 8. Bb5+
Bd7 9. Nxd7 Nbxd7 10. O-O a6 11. Ba4 b5 12. Nxb5 *
Position (FEN): r2qkb1r/3n1ppp/p4n2/1N1p4/B3p3/7P/PPPP1PP1/R1BQ1RK1 b kq - 0 12
Black to move.
Themes:  Opening  
Puzzle rating: 1229
Best move: axb5