Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Chigorin_Variation
Moves: 1. d4 d5 2. Nc3 e6 3. a3 Nf6 4. Bf4 b6 5. Nb5 a6 *
Position (FEN): rnbqkb1r/2p2ppp/pp2pn2/1N1p4/3P1B2/P7/1PP1PPPP/R2QKBNR w KQkq - 0 6
White to move.
Themes:  Opening  
Puzzle rating: 1224
Best move: Nxc7+