An entry in the Encyclopedia of Chess Openings (ECO B02), reached after 7 half-moves: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. a4.
1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. a4
No further variations branch from this position in our database. To explore neighbouring ideas: