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- (not 5.Bf4, 5.Nf3), 4.cxd5 exd5 — Exchange, D30-D39 1. d4 d5 2. c4 e6 Queen's gambit declined, D31 - 1. d4 d5 2. c4 e6 3. Nc3 - Queen's Gambit Declined: Queen's Knight Variation, D31 - 1. d4 d5 2. c4 e6 3. Nc3 Be7 - Queen's Gambit Declined: Charousek Variation, SÉRIE D
Interpolis 1981 – Round 1 – Miles, Anthony J – 1/2-1/2 – Ljubojevic, Ljubomir – G10

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- 6.a3 Bxc5, 7.Nf3 b6 8.Bg5, E20-E59 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 Nimzo-Indian defence, E39 - 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O - Nimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc Variation, SÉRIE E
Interpolis 1981 – Round 1 – Petrosian, Tigran A. – 1/2-1/2 – Larsen, Benjamin Holsko – G18

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- 11.b3 Bf6 12.Bb2 — Main Line, 9...c5 10.Rd1 d6 — Main Line, 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, SÉRIE E
Interpolis 1981 – Round 1 – Petrosian, Tigran A. – 1/2-1/2 – Portisch, Lajos – G22

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- 7.e3 e6 — Exchange, 8.Ne5, D10-D19 1. d4 d5 2. c4 c6 Queen's Gambit Slav defence, D14 - 1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 Bf5 - Slav Defense: Exchange Variation, Symmetrical Line, SÉRIE D
Interpolis 1981 – Round 1 – Portisch, Lajos – 1-0 – Beliavsky, Alexander G – G7

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- A10-A39 English Opening, A25 - 1. c4 e5 2. Nc3 Nc6 - English Opening: King's English Variation, Reversed Closed Sicilian, A25 - 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Rb1 Nh6 5. Bg2 Bg7 - English Opening: Closed, Taimanov Variation, A25 - 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4.... - English Opening, SÉRIE A
Interpolis 1981 – Round 1 – Portisch, Lajos – 1-0 – Ljubojevic, Ljubomir – G5

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- A60-A79 1. d4 Nf6 2. c4 c6 3. d5 e6 Modern Benoni Defense, A75 - 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O a6 10. a4 Bg4 - Benoni Defense: Classical Variation, Argentine Counterattack, A75 - 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4.... - Benoni Defense, SÉRIE A
Interpolis 1981 – Round 1 – Portisch, Lajos – 1/2-1/2 – Kasparov, Garry – G19

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- E20-E59 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 Nimzo-Indian defence, E59 - 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. a3 Bxc3 9. bxc3 dxc4 10. Bxc4 - Nimzo-Indian Defense: Normal Variation, Bernstein Defense, SÉRIE E
Interpolis 1981 – Round 1 – Portisch, Lajos – 1/2-1/2 – Miles, Anthony J – G16

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- 7.O-O (not 7...Rb8, 7...Bf5, 7...Bg4, 7...e5), E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E62 - 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6 - King's Indian Defense: Fianchetto Variation, Carlsbad Variation, SÉRIE E
Interpolis 1981 – Round 1 – Portisch, Lajos – 1/2-1/2 – Spassky, Boris Vasily – G25

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