A47
Marienbad System
1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5
The Marienbad System is a chess opening classified under ECO code A47. It is reached after the moves 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5.
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