Chess opening · ECO A48
London System
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1. d4 Nf6 2. Nf3 g6 3. Bf4
London System is catalogued under ECO code A48. It is reached after 3 moves (5 half-moves): 1. d4 Nf6 2. Nf3 g6 3. Bf4. After the last move it is Black to play. White opens 1. d4. It is the defining line of the London System family, which has 4 catalogued lines in total. 2 deeper lines continue from here, listed below.