411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Nf3
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Queen's Gambit Declined D37-D49 Queen's Gambit Declined
4. Nf3
Theory table
Semi-Slav Defence 4...c6 4...Be7 Ragozin Defence 4...Bb4 4...Nbd7 Semi-Tarrasch Defence 4...c5 Vienna variation 4...dxc4
References
Queen's Gambit Declined