D42
Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line
1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3
The Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line is a chess opening classified under ECO code D42. It is reached after the moves 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3.
It belongs to the Queen's Gambit Declined family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.
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