Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Morphy_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. d3 *
Position (FEN): r1bqkbnr/1ppp1ppp/p1n5/1B2p3/4P3/3P1N2/PPP2PPP/RNBQK2R b KQkq - 0 4
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 1432
Best move: axb5