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- 6.e4 Nxc3 — Main Line, 7.bxc3 cxd4 8.cxd4 Nc6, D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D41 - 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 4. g3 d5 5. d4 e6 - Queen's Gambit Declined: Semi-Tarrasch Defense, SÉRIE D
FIDE (30) 1976-1978 1977 – Round 1 – Petrosian, Tigran A. – 1/2-1/2 – Korchnoi, Viktor – G3
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- 8...O-O - 8…c5, D80-D99 Gruenfeld defence1. d4 Nf6 2. c4 g6 3. Nc3 d5, D87 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 c5 8. Ne2 O-O Grünfeld Defense: Exchange Variation, Spassky Variation|, SÉRIE D
FIDE (30) 1976-1978 1977 – Round 1 – Polugaevsky, Lev – 1/2-1/2 – Korchnoi, Viktor – G3
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