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- 3...cxd5 4.c4 Nf6 — Main Line, 5.Nc3 Nc6 6.Nf3 Bg4 7.cxd5 Nxd5 8.Qb3 Bxf3 9.gxf3 e6 — Main Line, B10 - B19 1. e4 c6 Caro-Kann defence, B13 - 1. e4 c6 2. d4 d5 3. exd5 - Caro-Kann Defense: Exchange Variation, SÉRIE B 1.e4 2....
Buenos Aires 1980 – Round 1 – Balashov, Yuri S – 1/2-1/2 – Hort, Vlastimil – G24

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- 7...cxd4 8.exd4 Be7 — Main Line, 9.O-O O-O 10.Re1 Nf6 11.a3 b6 12.Be3 — Main Line, D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D42 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3 - Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line, SÉRIE D
Buenos Aires 1980 – Round 1 – Balashov, Yuri S – 1/2-1/2 – Panno, Oscar – G22

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- 7.O-O e5, 8.Qc2 (not 8...c6), E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence, E67 - 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nbd7 - King's Indian Defense: Fianchetto Variation, Debrecen Defense, SÉRIE E
Buenos Aires 1980 – Round 1 – Browne, Walter S – 0-1 – Balashov, Yuri S – G16

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- 8.Nc3 Ne4, 9.Ne5, D70-D79 1. d4 Nf6 2. c4 g6 3. f3 d5 Neo-Gruenfeld defence, D79 - 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5 7. cxd5 cxd5 - Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation, SÉRIE D
Buenos Aires 1980 – Round 1 – Browne, Walter S – 0-1 – Kavalek, Lubomir – G10

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- A10-A39 English Opening, A26 - 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 - English Opening: King's English Variation, Closed System, Full Symmetry, A26 - 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. e4 - English Opening: King's English Variation, Botvinnik System, A26 - 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4.... - English Opening, SÉRIE A
Buenos Aires 1980 – Round 1 – Giardelli, Sergio C. – 1/2-1/2 – Balashov, Yuri S – G3

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- 10.Bh4 Bd7, B20 - B99 - 1. e4 c5 - Sicilian Defense, B60-B69 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 Sicilian, Richter-Rauzer, B64 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 e5 - Sicilian Defense: Richter-Rauzer Variation, Classical Variation, B64 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Buenos Aires 1980 – Round 1 – Karpov, Aleksandr – 0-1 – Timman, Jan H – G19

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- 6.f4 e6, 7.Nf3 Nge7 8.O-O O-O 9.Be3 Nd4 10.Rb1, B20 - B99 - 1. e4 c5 - Sicilian Defense, B25 - 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 - Sicilian Defense: Closed, B25 - 1. e4 c5 2. Nc3 Nc6 3. g3 g6 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Buenos Aires 1980 – Round 1 – Karpov, Anatoly – 1-0 – Quinteros, Miguel A. – G17

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- 5...g6 - Swiss Cheese Variation, B20 - B99 - 1. e4 c5 - Sicilian Defense, B40 - B49 1. e4 c5 2. Nf3 e6 Sicilian defence, B42 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 - Sicilian Defense: Kan Variation, Modern Variation, B42 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Buenos Aires 1980 – Round 1 – Kavalek, Lubomir – 1-0 – Olafsson, Fridrik – G20

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- A10-A39 English Opening, A17 - 1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. Nf3 c5 5. e3 e6 - English Opening: Anglo-Indian Defense, A17 - 1. c4 Nf6 2. Nc3 e6 - English Opening: Anglo-Indian Defense, Hedgehog System, SÉRIE A
Buenos Aires 1980 – Round 1 – Korchnoi, Viktor – 1/2-1/2 – Polugaevsky, Lev – G5

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