Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_Normal_Variation
Moves: 1. d4 e6 2. e4 Bb4+ 3. Bd2 Qe7 4. a3 Ba5 *
Position (FEN): rnb1k1nr/ppppqppp/4p3/b7/3PP3/P7/1PPB1PPP/RN1QKBNR w KQkq - 1 5
White to move.
Themes: Hanging Piece Opening  
Puzzle rating: 814
Best move: Bxa5