An entry in the Encyclopedia of Chess Openings (ECO A20), reached after 7 half-moves: 1. c4 e5 2. e3 Nf6 3. f4 exf4 4. Nf3.
1. c4 e5 2. e3 Nf6 3. f4 exf4 4. Nf3
No further variations branch from this position in our database. To explore neighbouring ideas: