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- D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D42 - 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3 - QGD, D42m - 12.* - Semi-Tarrasch, SÉRIE D
Interpolis 1980 – Round 1 – Ribli, Zoltan – 1/2-1/2 – Kavalek, Lubomir – G41
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- E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E99 - 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3 f5 - King's Indian Defense: Orthodox Variation, Classical System, Traditional Line (1991), E99o - 13.c5 - Mar del Plata (1956), SÉRIE E
Interpolis 1980 – Round 1 – Sosonko, Gennadi – 1/2-1/2 – Kavalek, Lubomir – G6
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- E12-E19 1. d4 Nf6 2. c4 e6 3. Nf3 b6 Queen's Indian defence, E19 - 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Qc2 Nxc3 9.Qxc3 - Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line, E19m - 11.* - Old Main Line, SÉRIE E
Interpolis 1980 – Round 1 – Sosonko, Gennadi – 1/2-1/2 – Portisch, Lajos – G13
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- D80-D99 Gruenfeld defence1. d4 Nf6 2. c4 g6 3. Nc3 d5, D99 - 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be3 Nfd7 9.Qb3 - Grünfeld Defense: Russian Variation, Smyslov Variation, D99f - 11.* - Russian, Smyslov, Main Line, SÉRIE D
Interpolis 1980 – Round 1 – Sosonko, Gennadi – 1/2-1/2 – Timman, Jan H – G16
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