| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. Portisch vs Minic |
| 1-0 | 43 |
1973 |
Ljubljana | A42 Modern Defense, Averbakh System |
| 27. V Macek vs Chiburdanidze |
| 0-1 | 38 |
1973 |
URS-YUG | B06 Robatsch |
| 28. B Starck vs C Syre |
| 1-0 | 46 |
1974 |
Potsdam ch-DDR | A42 Modern Defense, Averbakh System |
| 29. E O'Connor vs J Short |
| 0-1 | 35 |
1974 |
Mulcahy | A42 Modern Defense, Averbakh System |
| 30. H U Gruenberg vs T Paehtz Sr |
| 0-1 | 57 |
1974 |
Potsdam ch-DDR | A42 Modern Defense, Averbakh System |
| 31. M Karff vs E Polihroniade |
| 0-1 | 42 |
1974 |
Medellin ol (Women) pr-B | A42 Modern Defense, Averbakh System |
| 32. Larsen vs Quinteros |
 | 1-0 | 40 |
1975 |
Orense | A42 Modern Defense, Averbakh System |
| 33. V Liberzon vs M Czerniak |
| 1-0 | 57 |
1975 |
Netanya | A42 Modern Defense, Averbakh System |
| 34. L Popov vs Huebner |
| ½-½ | 24 |
1975 |
Wijk aan Zee Hoogovens | A42 Modern Defense, Averbakh System |
| 35. Tarjan vs Ivkov |
| 1-0 | 24 |
1976 |
Skopje | A42 Modern Defense, Averbakh System |
| 36. Ivkov vs K Notaros |
 | 1-0 | 69 |
1976 |
Novi Sad | A42 Modern Defense, Averbakh System |
| 37. M Litinskaya-Shul vs D Savereide |
| 1-0 | 31 |
1976 |
Tbilisi Interzonal (Women) | A42 Modern Defense, Averbakh System |
| 38. P Capello vs Kotov |
| 0-1 | 58 |
1976 |
La Valetta | A42 Modern Defense, Averbakh System |
| 39. H Ree vs C Van Wijgerden |
| 1-0 | 56 |
1977 |
Amsterdam IBM | A42 Modern Defense, Averbakh System |
| 40. G Sanchez vs Christiansen |
| 1-0 | 45 |
1977 |
Berkeley Cal Chess C | A42 Modern Defense, Averbakh System |
| 41. Silman vs K Czerniecki |
 | 1-0 | 54 |
1979 |
US Open | A42 Modern Defense, Averbakh System |
| 42. Fedorowicz vs J Rizzitano |
 | 1-0 | 27 |
1980 |
? | A42 Modern Defense, Averbakh System |
| 43. L Koraksic vs Ivkov |
 | 0-1 | 65 |
1980 |
Zemun 29/126 | A42 Modern Defense, Averbakh System |
| 44. P Stempin vs N Davies |
| 0-1 | 39 |
1981 |
Ch World (team) (under 26) | A42 Modern Defense, Averbakh System |
| 45. H Cording vs H J Cordes |
| ½-½ | 15 |
1981 |
BL 8182 HSK-FH Hamburg | A42 Modern Defense, Averbakh System |
| 46. D Polajzer vs N Davies |
| 0-1 | 19 |
1981 |
Ch World (team) (under 26) | A42 Modern Defense, Averbakh System |
| 47. S James vs T Brionne |
| ½-½ | 25 |
1981 |
EU-ch jr | A42 Modern Defense, Averbakh System |
| 48. Petrosian vs Ivkov |
 | 1-0 | 49 |
1982 |
Bugojno | A42 Modern Defense, Averbakh System |
| 49. O Cvitan vs Ivkov |
| ½-½ | 42 |
1982 |
Vrbas ch-YU | A42 Modern Defense, Averbakh System |
| 50. Larsen vs Ivkov |
| ½-½ | 50 |
1982 |
Bugojno | A42 Modern Defense, Averbakh System |