Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_La_Bourdonnais_Variation
Moves: 1. e4 e6 2. f4 c5 3. Nf3 Nc6 4. Bb5 a6 5. O-O *
Position (FEN): r1bqkbnr/1p1p1ppp/p1n1p3/1Bp5/4PP2/5N2/PPPP2PP/RNBQ1RK1 b kq - 1 5
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 1339
Best move: axb5