1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 - Rubinstein. 4...c5 - Hubner! Black challenges d4 immediately.
White's plans: Play Nf3, Bd3, O-O. Maintain center control. Black's plans: Play ...Nc6, ...d5, ...O-O. Active piece play.
Watch the moves to understand the opening sequence. Use the controls to replay or auto-play the variation.