The QGD – Symmetrical (Austrian) Defence arises after 1.d4 d5 2.c4 c5. ECO code: D06.

The Tarrasch Defence—Black challenges d4 with ...c5 before ...e6, accepting an isolated queen's pawn in exchange for active piece play. The symmetrical pawn structure leads to open, dynamic positions where Black's piece activity compensates for structural weaknesses.