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1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.c3 · ECO D05
Queen's Pawn Game: Colle System, Traditional Colle is a chess opening that arises after 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.c3. It is classified D05 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Queen's Pawn Game family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.c3.