Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_McDonnell_Attack
Moves: 1. e4 c5 2. f4 g6 3. c3 Bg7 4. Nf3 Nc6 5. d4 cxd4 6. cxd4 Nxd4 *
Position (FEN): r1bqk1nr/pp1pppbp/6p1/8/3nPP2/5N2/PP4PP/RNBQKB1R w KQkq - 0 7
White to move.
Themes:  Opening  
Puzzle rating: 1022
Best move: Nxd4