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- A10-A39 English Opening, A39 - 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4 - English [+0.23], A39q - 7…cxd4 8.Nxd4 Nxd4 9.Qxd4 d6 10.Qd3 a6 11.Bd2 - Symmetrical Main Line [+0.38], SÉRIE A
Petropolis Interzonal 1973 – Round 1 – Hort, Vlastimil – 1/2-1/2 – Geller, Efim P – G1
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- E12-E19 1. d4 Nf6 2. c4 e6 3. Nf3 b6 Queen's Indian defence, E17 - 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 - Queen’s Indian [+0.41], E17h - 6.Nc3 Ne4 7.Bd2 - Opovcensky Variation [+0.22], SÉRIE E
Petropolis Interzonal 1973 – Round 1 – Reshevsky, Samuel – 1/2-1/2 – Polugaevsky, Lev – G3
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- C70-C79 Ruy Lopez1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 ....., C73 - 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ - Spanish [+0.20], C73c - 5…bxc6 6.d4 - Modern Steinitz Richter Variation [+0.13], SÉRIE C
Petropolis Interzonal 1973 – Round 10 – Mecking, Henrique – 1/2-1/2 – Keres, Paul – G40
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- 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 [+0.52], B36i - 5…Nf6 6.Nc3 d6 7.Be2 Nxd4 8.Qxd4 Bg7 - Maroczy Bind [+0.35], SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 11 – Keres, Paul – 1-0 – Hug, Werner – G42
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