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/6. e3/6...c5/7. dxc5/7...Bxc5
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Queen’s Gambit Declined, Blackburne Variation, Main Line
7...Bxc5
Black recaptures the pawn. Now White can play the unambitious 8. cxd5 and saddle black with an isolani, or continue going down the rabbit hole with the mainline 8. Qc2, where the queen points towards the black kingside. It should be noted that 8. a3 transposes into the mainline.