411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Bg5/4...Be7/5. e3/5...O-O
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Queen's Gambit Declined D54-69 Orthodox variation
5...O-O
Theory table
6. Nf3 6. Rc1
References
See also