Chess puzzle (Advantage)
Opening: Neo-Grunfeld_Defense, Neo-Grunfeld_Defense_Non-_or_Delayed_Fianchetto
Moves: 1. d4 Nf6 2. Nf3 g6 3. c4 d5 4. cxd5 Nxd5 5. e3 Bg7 6. e4 Nb6 7. a4 a5 8. Nc3
O-O 9. Be3 Na6 10. h3 Bd7 11. Be2 Nb4 12. O-O e6 13. Rc1 Nxa4 *
Position (FEN): r2q1rk1/1ppb1pbp/4p1p1/p7/nn1PP3/2N1BN1P/1P2BPP1/2RQ1RK1 w - - 0 14
White to move.
Themes:  Opening  
Puzzle rating: 864
Best move: Nxa4