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- D40-D42 – 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 – Queen’s Gambit Declined: Semi-Tarrasch Defense, D41 - 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 - QGD [+0.31], D41l - 5…Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Nc6 - Semi-Tarrasch [+0.36], SÉRIE D
FIDE (30) 1976-1978 1977 – Round 1 – Petrosian, Tigran V. – 1/2-1/2 – Korchnoi, Viktor – G3
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- 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 O-O 8.Ne2 c5 - Gruenfeld [+0.33], D87i - 9.O-O Nc6 10.Be3 Na5 - Classical Exchange [+0.45], SÉRIE D
FIDE (30) 1976-1978 1977 – Round 1 – Polugaevsky, Lev – 1/2-1/2 – Korchnoi, Viktor – G3
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