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- 4.Qa4+ c6 — Main Line, D20-D29 1. d4 d5 2. c4 dxc4 Queen's gambit accepted, D23a - 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 - Queen's Gambit Accepted, D23p - 5.Qxc4 Bf5 6.g3 e6 7.Bg2 Nbd7 8.O-O Be7 9.Nc3 O-O (not 10.Bg5, 10.e3), SÉRIE D
Interpolis 1983 – Round 1 – Andersson, Ulf 1949 – 1/2-1/2 – Huebner, Robert – G39

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- 5.Bf4 O-O, D30-D39 1. d4 d5 2. c4 e6 Queen's gambit declined, D37a - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 - Queen's Gambit Declined: Three Knights Variation, D37b - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 - Queen's Gambit Declined: Barmen Variation, D37q - 6.e3 c5 7.dxc5 Bxc5 8.cxd5, SÉRIE D
Interpolis 1983 – Round 1 – Huebner, Robert – 1/2-1/2 – Karpov, Aleksandr – G6

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