411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Nf3/4...Be7/5. Bf4/5...O-O
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Queen's Gambit Declined rd nd bd qd rd kd pd pd pd bd pd pd pd pd nd pd pl pl bl nl nl pl pl pl pl pl pl rl ql kl bl rl
Queen's Gambit Declined
Blackburne Variation
Black castles. White has no alternative to 6. e3