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- 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, E39b - 6.Bf4 - Classical, Pirc (1954), SÉRIE E
Petropolis Interzonal 1973 – Round 7 – Hort, Vlastimil – 0-1 – Ivkov, Borislav – G26
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- 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, C97 - 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 Na5 - Ruy Lopez: Closed, Chigorin Defense, C97f - 12…Re8 - Spanish: Closed, Chigorin (1909), SÉRIE C
Petropolis Interzonal 1973 – Round 7 – Keres, Paul – 0-1 – Smyslov, Vassily – G28
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- 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, B42f - 6.* - Kan Variation, Polugaevsky Variation, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 8 – Biyiasas, Peter – 1/2-1/2 – Smyslov, Vassily – G32
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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, B87 - 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 a6 7.Bb3 b5 - Sicilian (1960), B87d - 9.f4 - Sozin-Najdorf (1959), SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 8 – Gheorghiu, Florin – 0-1 – Polugaevsky, Lev – G31
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- A10-A39 English Opening, A16 - 1.c4 Nf6 2.Nc3 - Anglo-Indian Defense, Queen's Knight Variation, A16a - 3…Nxd5 4.g3 g6 5.Bg2 Nb6 - English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation (1932), SÉRIE A
Petropolis Interzonal 1973 – Round 8 – Panno, Oscar – 1/2-1/2 – Hort, Vlastimil – G30
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