Chess puzzle (Advantage)
Opening: Four_Knights_Game, Four_Knights_Game_Italian_Variation
Moves: 1. e4 Nf6 2. Nc3 e5 3. Nf3 Bc5 4. Bc4 Nc6 5. O-O d6 6. h3 h6 7. Qe2 Qe7 8. Nd5
Nxd5 9. Bxd5 Bd7 10. c3 O-O-O 11. a4 Bb6 12. b4 g5 13. a5 g4 14. Nh2 g3 15. Nf3
Bxf2+ 16. Rxf2 gxf2+ 17. Kxf2 Qe8 18. Qc4 f5 *
Position (FEN): 2krq2r/pppb4/2np3p/P2Bpp2/1PQ1P3/2P2N1P/3P1KP1/R1B5 w - - 0 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1221
Best move: b5