Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Chigorin_Variation
Moves: 1. Nf3 Nc6 2. d4 d5 3. c4 e6 4. cxd5 exd5 5. Nc3 Nf6 6. Qb3 Bd6 7. Nxd5 *
Position (FEN): r1bqk2r/ppp2ppp/2nb1n2/3N4/3P4/1Q3N2/PP2PPPP/R1B1KB1R b KQkq - 0 7
Black to move.
Themes:  Opening  
Puzzle rating: 1583
Best move: Nxd5