Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Chigorin_Defense
Moves: 1. d4 d5 2. c4 Nc6 3. g3 Bf5 4. Bg2 e6 5. Nf3 Nb4 6. Qa4+ c6 7. c5 *
Position (FEN): r2qkbnr/pp3ppp/2p1p3/2Pp1b2/Qn1P4/5NP1/PP2PPBP/RNB1K2R b KQkq - 0 7
Black to move.
Themes:  Middlegame  
Puzzle rating: 893
Best move: Nc2+