ECO A47
Marienbad System
The position after 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5.
Marienbad System
8 half-moves in · no named continuation
8♜
♞
♛
♚
♝
♜
7♟
♝
♟
♟
♟
♟
♟
6
♟
♞
5
♟
4
♙
3
♘
♙
2♙
♙
♙
♙
♙
♗
♙
a1♖
b♘
c♗
d♕
e♔
f
g
h♖
1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5
Marienbad System is filed under ECO A47. It is the position after 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 — 8 half-moves in, with White to move. Named theory ends here; beyond this the position is yours to work out.