The Marienbad System reaches a named position after 4 moves: 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5
In practical games, this line matters because the early pawn and piece choices decide which middlegame plans are natural. Use the board above to learn the move order, then complete Practice without hints before adding the opening to your regular queue.
If this exact branch does not appear in your games, study the related lines below. Openings often transpose, and recognizing the family pattern is more useful than memorizing one narrow sequence.
Position details
The defining move is c5.
rn1qkb1r/pb1ppppp/1p3n2/2p5/3P4/5NP1/PPP1PPBP/RNBQK2R w KQkq - 0 5