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- 7...cxd4 8.Nxd4 Nxd4 — Main Line, 9.Qxd4 d6 10.Qd3 a6 11.Bd2 Rb8 — Main Line, A10-A39 English Opening, A39 - 1. c4 Nf6 2. Nf3 c5 3. Nc3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O O-O 7. d4 - English Opening: Symmetrical Variation, Mecking Variation, SÉRIE A
Petropolis Interzonal 1973 – Round 1 – Hort, Vlastimil – 1/2-1/2 – Geller, Efim P – G1

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- C60-C69 1. e4 e5 2. Nf3 Nc6 3. Bb5 Ruy Lopez (Spanish opening), C68 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 - Ruy Lopez: Exchange Variation, C69 - 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O - Ruy Lopez: Exchange Variation, Normal Variation, SÉRIE C
Petropolis Interzonal 1973 – Round 10 – Gheorghiu, Florin – 0-1 – Smyslov, Vladimir – G39

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- A10-A39 English Opening, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. d3 - English Opening: King's English Variation, Four Knights Variation, Flexible Line, A28 - 1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4.... - English Opening, SÉRIE A
Petropolis Interzonal 1973 – Round 10 – Panno, Oscar – 1/2-1/2 – Portisch, Lajos – G37

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- 5...Nf6 6.Nc3 d6, 7.Be2 Nxd4 8.Qxd4 Bg7, B20 - B99 - 1. e4 c5 - Sicilian Defense, B30 - B39 1.e4 c5 2. Nf3 Nc6 Sicilian defence, B36 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 - Sicilian Defense: Accelerated Dragon, Maróczy Bind, B36 - 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4.... - Sicilian Defense, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 11 – Keres, Paul – 1-0 – Hug, Werner – G42

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- 6...e6 7.Bxc4 Bb4, 8.O-O O-O 9.Nh4 Bg4, D10-D19 1. d4 d5 2. c4 c6 Queen's Gambit Slav defence, D18 - 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 - Slav Defense: Czech Variation, Classical System, SÉRIE D
Petropolis Interzonal 1973 – Round 11 – Portisch, Lajos – 1/2-1/2 – Hort, Vlastimil – G45

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