Chess opening · ECO A48
London System, with Bd3
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1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6 5. Bd3
London System, with Bd3 is catalogued under ECO code A48. It is reached after 5 moves (9 half-moves): 1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 d6 5. Bd3. After the last move it is Black to play. White opens 1. d4. It is the defining line of the London System, with Bd3 family, which has 1 catalogued line in total.