A48
London System
1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6
The London System is a chess opening classified under ECO code A48. It is reached after the moves 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6.
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