Chess puzzle (Advantage)
Opening: Polish_Opening, Polish_Opening_Schiffler-Sokolsky_Variation
Moves: 1. b4 Nf6 2. Bb2 e6 3. b5 d5 4. e3 Bd7 5. Nf3 c6 6. a4 a6 7. Ne5 axb5 8. Nxd7
Qxd7 9. axb5 Rxa1 10. Bxa1 cxb5 11. Nc3 Bb4 12. Nxb5 O-O *
Position (FEN): 1n3rk1/1p1q1ppp/4pn2/1N1p4/1b6/4P3/2PP1PPP/B2QKB1R w K - 1 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1233
Best move: Bxf6