An entry in the Encyclopedia of Chess Openings (ECO E21), reached after 9 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5.
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. d5
No further variations branch from this position in our database. To explore neighbouring ideas: