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- 6...h6 7.Bxf6 Bxf6 — Orthodox, 8.Rc1 c6 9.Bd3 Nd7 10.O-O dxc4 11.Bxc4, D50-D69 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Queen's Gambit Declined, 4.Bg5, D55 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 - Queen's Gambit Declined: Modern Variation, Normal Line, SÉRIE D
Petropolis Interzonal 1973 – Round 16 – Ivkov, Borislav – 1/2-1/2 – Geller, Efim P – G70

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- B20 - B99 - 1. e4 c5 - Sicilian Defense, B80-B85 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 Sicilian, Scheveningen variation, B83 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 - Sicilian Defense: Scheveningen Variation, Classical Variation, B83 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 17 – Geller, Efim P – 1/2-1/2 – Panno, Oscar – G72

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- B20 - B99 - 1. e4 c5 - Sicilian Defense, B80-B85 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 Sicilian, Scheveningen variation, B85 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 a6 7. O-O Nf6 8. Be3 Be7 9. f4 d6 10. Qe1 O-O - Sicilian Defense: Scheveningen Variation, Classical Main Line, B85 - 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 17 – Smyslov, Vladimir – 1-0 – Hort, Vlastimil – G73

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- 7.O-O, B20 - B99 - 1. e4 c5 - Sicilian Defense, B50-B59 Sicilian 1. e4 c5 2. Nf3 d6, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5 Bd7 4. Bxd7 Qxd7 5. O-O Nc6 - Sicilian Defense: Moscow Variation, Main Line, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5 Bd7 4. Bxd7 Qxd7 5. O-O Nc6 6. c3 - Sicilian Defense: Moscow Variation, Main Line, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 - Sicilian Defense: Moscow Variation, Main Line, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ - Sicilian Defense: Moscow Variation, Main Line, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. O-O - Sicilian Defense: Moscow Variation, Main Line, B52 - 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. O-O Nc6 6. c3 Nf6 7. d4 - Sicilian Defense: Moscow Variation, Haag Gambit, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 2 – Gheorghiu, Florin – 1/2-1/2 – Hort, Vlastimil – G6

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- 10...Nbd7 11.Nbd2 Bb7 — Main Line, 12.Bc2 Re8 13.Nf1 Bf8 14.Ng3 g6 15.a4 c5 — Main Line, C90-C99 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d6 Ruy Lopez, closed, C95 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 - Ruy Lopez: Closed, Breyer, SÉRIE C
Petropolis Interzonal 1973 – Round 2 – Keres, Paul Petrovich – 1/2-1/2 – Reshevsky, Samuel – G8

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- 6.g3 Nc6 — Main Line, 7.Bg2 Be7 8.O-O O-O 9.Nxd5 — Main Line, D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D41 - 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 d5 5. d4 e6 - Queen's Gambit Declined: Semi-Tarrasch Defense, SÉRIE D
Petropolis Interzonal 1973 – Round 23 – Portisch, Lajos – 1-0 – Keres, Paul – G75

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