Chess puzzle (Advantage)
Opening: Four_Knights_Game, Four_Knights_Game_Italian_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nf6 5. h3 O-O 6. O-O Na5 7. Bd3 Bd4 8.
Nxd4 exd4 9. Nb1 d6 10. Na3 a6 11. Nc4 Nxc4 12. Bxc4 Be6 13. Bxe6 fxe6 14. d3
e5 15. Bd2 d5 16. exd5 Nxd5 17. c3 Qh4 18. cxd4 Qxd4 19. Qc2 Nb4 *
Position (FEN): r4rk1/1pp3pp/p7/4p3/1n1q4/3P3P/PPQB1PP1/R4RK1 w - - 2 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1581
Best move: Qb3+