Chess puzzle (Advantage)
Opening: Three_Knights_Opening, Three_Knights_Opening_Other_variations
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Bc5 4. Bc4 d6 5. Nb5 a6 6. d4 *
Position (FEN): r1bqk1nr/1pp2ppp/p1np4/1Nb1p3/2BPP3/5N2/PPP2PPP/R1BQK2R b KQkq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 1681
Best move: axb5