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1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4 · ECO A47
Marienbad System: Berg Variation is a chess opening that arises after 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4. It is classified A47 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Marienbad System family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4.