Round 1 Korchnoi vs Petrosian, 1977  (A14) English, 22 moves, 1/2-1/2 Round 2 Petrosian vs Korchnoi, 1977 (D41) Queen's Gambit Declined, Semi-Tarrasch, 17 moves, 1/2-1/2 Round 3 Korchnoi vs Petrosian, 1977  (E05) Catalan, Open, Classical line, 39 moves, 1/2-1/2 Round 4 Petrosian vs Korchnoi, 1977  (D41) Queen's Gambit Declined, Semi-Tarrasch, 22 moves, 1/2-1/2 Round 5 Korchnoi vs Petrosian, 1977  (A29) English, Four Knights, Kingside Fianchetto, 71 moves, 1-0 Round 6 Petrosian vs Korchnoi, 1977  (D41) Queen's Gambit Declined, Semi-Tarrasch, 37 moves, 1-0 Round 7 Korchnoi vs Petrosian, 1977 (D61) Queen's Gambit Declined, Orthodox, Rubinstein Attack, 25 moves, 1/2-1/2 Round 8 Petrosian vs Korchnoi, 1977  (E15) Queen's Indian, 57 moves, 0-1 Round 9 Korchnoi vs Petrosian, 1977 (E06) Catalan, Closed, 5.Nf3, 43 moves, 1/2-1/2 Round 10 Petrosian vs Korchnoi, 1977  (E19) Queen's Indian, Old Main line, 9.Qxc3, 15 moves, 1/2-1/2 Round 11 Korchnoi vs Petrosian, 1977  (E06) Catalan, Closed, 5.Nf3, 27 moves, 1/2-1/2 Round 12 Petrosian vs Korchnoi, 1977  (E14) Queen's Indian, 40 moves, 1/2-1/2 12 games