Chess puzzle (Advantage)
Opening: Grunfeld_Defense, Grunfeld_Defense_Russian_Variation
Moves: 1. Nf3 Nf6 2. d4 g6 3. c4 Bg7 4. Nc3 d5 5. Qb3 dxc4 6. Qxc4 Be6 7. Qb5+ Nc6 8.
Qxb7 Nxd4 *
Position (FEN): r2qk2r/pQp1ppbp/4bnp1/8/3n4/2N2N2/PP2PPPP/R1B1KB1R w KQkq - 0 9
White to move.
Themes:  Opening  
Puzzle rating: 870
Best move: Nxd4