Chess opening · ECO A47
Marienbad System
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1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5
Marienbad System is catalogued under ECO code A47. It is reached after 4 moves (8 half-moves): 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5. After the last move it is White to play. White opens 1. d4. It is the defining line of the Marienbad System family, which has 2 catalogued lines in total.