Chess puzzle (Crushing)
Opening: London_System, London_System_Other_variations
Moves: 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 O-O 5. c3 e6 6. Bd3 d6 7. e4 c5 8. e5 dxe5
9. dxe5 Nfd7 10. O-O b6 *
Position (FEN): rnbq1rk1/p2n1pbp/1p2p1p1/2p1P3/5B2/2PB1N2/PP3PPP/RN1Q1RK1 w - - 0 11
White to move.
Themes:  Opening  
Puzzle rating: 1599
Best move: Be4