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- 7.Qa4, D70-D79 1. d4 Nf6 2. c4 g6 3. f3 d5 Neo-Gruenfeld defence, D78 - 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 c6 6. O-O d5 - Neo-Grünfeld Defense: Classical Variation, Original Defense, SÉRIE D
Petropolis Interzonal 1973 – Round 9 – Portisch, Lajos – 1-0 – Ivkov, Borislav – G36

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- 8.cxd5 (not 8...exd5), D50-D69 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Queen's Gambit Declined, 4.Bg5, D58 - 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 - Queen's Gambit Declined: Tartakower Defense, SÉRIE D
Petropolis Interzonal 1973 – Round 9 – Smyslov, Vladimir – 1/2-1/2 – Geller, Efim P – G34

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