Chess puzzle (Advantage)
Opening: Zukertort_Opening, Zukertort_Opening_Queens_Gambit_Invitation
Moves: 1. Nf3 e6 2. d4 d5 3. Bf4 a6 4. e3 c5 5. c4 dxc4 6. Bxc4 b5 7. Bd3 c4 *
Position (FEN): rnbqkbnr/5ppp/p3p3/1p6/2pP1B2/3BPN2/PP3PPP/RN1QK2R w KQkq - 0 8
White to move.
Themes:  Opening  
Puzzle rating: 1419
Best move: Be4