1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 - Two Knights. 4.Nc3 - Four Knights! Symmetrical development.
White's plans: Play d4 or d3. Castle and develop. Black's plans: Play ...Bc5 or ...Bb4. Mirror White's play.
Watch the moves to understand the opening sequence. Use the controls to replay or auto-play the variation.