An entry in the Encyclopedia of Chess Openings (ECO E20), reached after 7 half-moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3.
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3
No further variations branch from this position in our database. To explore neighbouring ideas: