Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Berlin_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Nd4 5. Nxd4 exd4 6. Bg5 c6 7. Ba4 *
Position (FEN): r1bqkb1r/pp1p1ppp/2p2n2/6B1/B2pP3/3P4/PPP2PPP/RN1QK2R b KQkq - 1 7
Black to move.
Themes:  Opening  
Puzzle rating: 1077
Best move: Qa5+