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- 5.e3 Nc6, 6.a3 dxc4, D40 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 - Queen's Gambit Declined: Semi-Tarrasch Defense, D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, SÉRIE D
Manila Interzonal 1990 – Round 4 – Gulko, Boris – 1-0 – El Taher, Fouad – G74

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- 5.dxc5 Na6, 6.a3 Bxc3+ 7.Qxc3 Nxc5 8.b4 Nce4 9.Qd4 d5 10.c5, E20-E59 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 Nimzo-Indian defence, E38 - 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 - Nimzo-Indian Defense: Classical Variation, Berlin Variation, SÉRIE E
Manila Interzonal 1990 – Round 4 – Ivanchuk, Vasyl – 1-0 – De Firmian, Nick – G63

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- 6.Be2 Nc6, B20 - B99 - 1. e4 c5 - Sicilian Defense, B70 - 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 - Sicilian Defense: Dragon Variation, B70-B79 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 Sicilian, dragon variation, SÉRIE B 1.e4 2....
Manila Interzonal 1990 – Round 4 – Ljubojevic, Ljubomir – 1/2-1/2 – Korchnoi, Viktor – G67

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