Chess puzzle (Advantage)
Opening: Philidor_Defense, Philidor_Defense_Other_variations
Moves: 1. e4 e5 2. Nf3 d6 3. Bc4 a6 4. c3 h6 5. d4 Nc6 6. dxe5 Bg4 7. Qb3 Be6 8. Qxb7
*
Position (FEN): r2qkbnr/1Qp2pp1/p1npb2p/4P3/2B1P3/2P2N2/PP3PPP/RNB1K2R b KQkq - 0 8
Black to move.
Themes:  Opening  
Puzzle rating: 1541
Best move: Na5