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Marienbad System is a chess opening that arises after 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5. It is classified A47 in the ECO system, and the position after these moves has white to move.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5. Open any of them to load the position on the board.