| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. K Langeweg vs R Mollekens |
| 1-0 | 38 | 1959 | NED-BEL | E12 Queen's Indian |
| 2. C van den Berg vs K Langeweg |
| ½-½ | 27 | 1959 | Hoogovens | B90 Sicilian, Najdorf |
| 3. K Langeweg vs F Olafsson |
| 0-1 | 27 | 1959 | Hoogovens | D78 Neo-Grunfeld, 6.O-O c6 |
| 4. T van Scheltinga vs K Langeweg |
| 1-0 | 29 | 1959 | Hoogovens | E60 King's Indian Defense |
| 5. K Langeweg vs Larsen |
 | ½-½ | 46 | 1959 | Hoogovens | A05 Reti Opening |
| 6. J Barendregt vs K Langeweg |
| 1-0 | 30 | 1959 | Hoogovens | A30 English, Symmetrical |
| 7. Eliskases vs K Langeweg |
| 1-0 | 33 | 1959 | Hoogovens | A14 English |
| 8. K Langeweg vs O'Kelly |
| ½-½ | 44 | 1959 | Hoogovens | A07 King's Indian Attack |
| 9. R Toran vs K Langeweg |
| 1-0 | 38 | 1959 | Hoogovens | A60 Benoni Defense |
| 10. K Langeweg vs J H Donner |
| ½-½ | 44 | 1959 | Hoogovens | A04 Reti Opening |
| 11. Lombardy vs K Langeweg |
| 1-0 | 35 | 1960 | WchT U26 07th | A07 King's Indian Attack |
| 12. B Malich vs K Langeweg |
| 1-0 | 30 | 1960 | WchT U26 07th | A45 Queen's Pawn Game |
| 13. D van Geet vs K Langeweg |
| 1-0 | 38 | 1960 | Hoogovens-B | B29 Sicilian, Nimzovich-Rubinstein |
| 14. L Rellstab vs K Langeweg |
| 1-0 | 33 | 1960 | Hoogovens-B | D32 Queen's Gambit Declined, Tarrasch |
| 15. H Bredewout vs K Langeweg |
| 0-1 | 40 | 1960 | Hoogovens-B | B83 Sicilian |
| 16. J Marsalek vs K Langeweg |
| 1-0 | 42 | 1960 | WchT U26 07th | D01 Richter-Veresov Attack |
| 17. J Kostro vs K Langeweg |
| ½-½ | 32 | 1960 | Leipzig Olympiad qual-2 | B29 Sicilian, Nimzovich-Rubinstein |
| 18. K Langeweg vs A Bisguier |
| 0-1 | 33 | 1960 | Leipzig Olympiad Final-A | A25 English |
| 19. N Minev vs K Langeweg |
| 1-0 | 25 | 1960 | Leipzig Olympiad Final-A | E43 Nimzo-Indian, Fischer Variation |
| 20. K Langeweg vs G Pfeiffer |
| 0-1 | 95 | 1960 | Leipzig Olympiad Final-A | A06 Reti Opening |
| 21. K Langeweg vs A Giustolisi |
| 0-1 | 44 | 1961 | Clare Benedict Cup | D91 Grunfeld, 5.Bg5 |
| 22. M J Haygarth vs K Langeweg |
| 0-1 | 25 | 1961 | Clare Benedict Cup | A53 Old Indian |
| 23. K Langeweg vs W Bialas |
| 1-0 | 45 | 1961 | Clare Benedict Cup | A13 English |
| 24. E Walther vs K Langeweg |
| 1-0 | 27 | 1961 | Clare Benedict Cup | C05 French, Tarrasch |
| 25. K Langeweg vs A Prameshuber |
| 1-0 | 60 | 1961 | Clare Benedict Cup | D41 Queen's Gambit Declined, Semi-Tarrasch |
Kibitzing
