Marienbad System

An entry in the Encyclopedia of Chess Openings (ECO A47), reached after 8 half-moves: 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5.

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5.c4 1 line
- A47 Berg Variation

About this opening

Marienbad System is an opening in the Encyclopedia of Chess Openings, classified under code A47. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2 c5.

The opening sequence in prose form: 1.d4 Nf6, 2.Nf3 b6, 3.g3 Bb7, 4.Bg2 c5. From this position exactly one named continuation is recorded in the encyclopaedia.