| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Wieweg vs B Jansson |
| 0-1 | 29 | 1970 | Swedish Championship | B09 Pirc, Austrian Attack |
| 27. K Skold vs J Wieweg |
| ½-½ | 60 | 1970 | Swedish Championship | B40 Sicilian |
| 28. J Wieweg vs M Johansson |
| 0-1 | 31 | 1970 | Swedish Championship | C82 Ruy Lopez, Open |
| 29. O Kinnmark vs J Wieweg |
| 1-0 | 54 | 1970 | Swedish Championship | C93 Ruy Lopez, Closed, Smyslov Defense |
| 30. B Andersson vs J Wieweg |
| 0-1 | 40 | 1970 | Swedish Championship | C93 Ruy Lopez, Closed, Smyslov Defense |
| 31. J Wieweg vs H Heikkila |
| 1-0 | 29 | 1970 | WchT U26 17th | B09 Pirc, Austrian Attack |
| 32. H Gundersen vs J Wieweg |
| 0-1 | 40 | 1971 | Reykjavik | C26 Vienna |
| 33. J Wieweg vs J Aijala |
| 0-1 | 28 | 1972 | World Student Team Championship Final-B | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 34. J Wieweg vs W Schmidt |
| 0-1 | 37 | 1973 | Eksjo | B46 Sicilian, Taimanov Variation |
| 35. L Liljedahl vs J Wieweg |
| 0-1 | 51 | 1973 | Eksjo | A16 English |
| 36. J Wieweg vs H Ek |
| 0-1 | 31 | 1973 | Eksjo | C16 French, Winawer |
| 37. B Soos vs J Wieweg |
| ½-½ | 56 | 1973 | Eksjo | E80 King's Indian, Samisch Variation |
| 38. J Wieweg vs L Ljungquist |
| 0-1 | 24 | 1973 | Eksjo | C11 French |
| 39. H Akvist vs J Wieweg |
| 1-0 | 87 | 1973 | Eksjo | A07 King's Indian Attack |
| 40. J Wieweg vs R Bellin |
| 1-0 | 35 | 1973 | Eksjo | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 41. H Hecht vs J Wieweg |
| 1-0 | 36 | 1973 | Eksjo | B40 Sicilian |
| 42. J Wieweg vs M Czerniak |
 | 0-1 | 27 | 1973 | Eksjo | B06 Robatsch |
| 43. J Wieweg vs Y Rantanen |
| 0-1 | 69 | 1974 | Eksjo 2nd | B43 Sicilian, Kan, 5.Nc3 |
| 44. O Jakobsen vs J Wieweg |
| 0-1 | 41 | 1974 | Rilton Cup 1974/75 | E97 King's Indian |
| 45. D Hansson vs J Wieweg |
| 1-0 | 25 | 1975 | Stockholm | C33 King's Gambit Accepted |
| 46. J Johansson vs J Wieweg |
| 1-0 | 31 | 1992 | Malmo GP-3 op | A48 King's Indian |
| 47. T Ernst vs J Wieweg |
| 1-0 | 34 | 1992 | Gothenburg op | C74 Ruy Lopez, Modern Steinitz Defense |
| 48. K Wiman vs J Wieweg |
| 0-1 | 27 | 1992 | Stockholm op | C21 Center Game |
| 49. J Wieweg vs J Johansson |
| 1-0 | 30 | 1992 | Stockholm GP-1 | B06 Robatsch |
| 50. J Wieweg vs M Sjoberg |
| 1-0 | 43 | 1993 | Salongernas Elo | B40 Sicilian |
Kibitzing
