1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e4 - English Opening: Four Knights System, Nimzowitsch Variation

English Opening: Four Knights System, Nimzowitsch Variation

Coups: 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. e4