Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Old_Sicilian
Moves: 1. e4 c5 2. Nf3 Nc6 3. c3 d5 4. exd5 Qxd5 5. d4 Nf6 6. Be3 Ng4 7. Nbd2 Nxe3 8.
fxe3 cxd4 9. exd4 g6 10. Bc4 Qh5 11. O-O Bg7 12. Qb3 O-O 13. Ne4 Qg4 14. Neg5
e6 15. d5 *
Position (FEN): r1b2rk1/pp3pbp/2n1p1p1/3P2N1/2B3q1/1QP2N2/PP4PP/R4RK1 b - - 0 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 1568
Best move: Na5