Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_Normal_Variation
Moves: 1. d4 e6 2. e4 Bb4+ 3. Ke2 Nf6 4. Bd2 Nxe4 *
Position (FEN): rnbqk2r/pppp1ppp/4p3/8/1b1Pn3/8/PPPBKPPP/RN1Q1BNR w kq - 0 5
White to move.
Themes: Hanging Piece Opening  
Puzzle rating: 801
Best move: Bxb4