An entry in the Encyclopedia of Chess Openings (ECO A06), reached after 7 half-moves: 1. Nf3 d5 2. e3 c5 3. c4 dxc4 4. b3.
1. Nf3 d5 2. e3 c5 3. c4 dxc4 4. b3
No further variations branch from this position in our database. To explore neighbouring ideas: