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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 Defense: Traditional Variation, E17h - 7…* - Opocensky Variation, SÉRIE E
Petropolis Interzonal 1973 – Round 1 – Reshevsky, Samuel – 1/2-1/2 – Polugaevsky, Lev – G3
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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 Defense: Accelerated Dragon, Maróczy Bind, B36i - 9.* - Maroczy Bind, SÉRIE B 1.e4 2....
Petropolis Interzonal 1973 – Round 11 – Keres, Paul – 1-0 – Hug, Werner – G42
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- 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, D18q - 9…Bg4 - Dutch (1967), SÉRIE D
Petropolis Interzonal 1973 – Round 11 – Portisch, Lajos – 1/2-1/2 – Hort, Vlastimil – G45
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