An entry in the Encyclopedia of Chess Openings (ECO A03), reached after 9 half-moves: 1. f4 d5 2. b3 Nf6 3. Bb2 d4 4. Nf3 c5 5. e3.
1. f4 d5 2. b3 Nf6 3. Bb2 d4 4. Nf3 c5 5. e3
No further variations branch from this position in our database. To explore neighbouring ideas: