Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Alapin_Variation
Moves: 1. e4 c5 2. c3 Nc6 3. d4 cxd4 4. cxd4 e6 5. Nf3 Nf6 6. Nc3 a6 7. Bg5 h6 8. Bh4
Be7 9. Bd3 d5 10. exd5 Nxd5 11. Bxe7 Ndxe7 12. O-O O-O 13. a3 Nxd4 *
Position (FEN): r1bq1rk1/1p2npp1/p3p2p/8/3n4/P1NB1N2/1P3PPP/R2Q1RK1 w - - 0 14
White to move.
Themes:  Opening  
Puzzle rating: 1317
Best move: Nxd4