| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Karpov vs K H Maeder |
 | 1-0 | 31 |
1967 |
02, Groningen Ech-jr fin | B25 Sicilian, Closed |
| 2. K H Maeder vs J Moles |
| 0-1 | 34 |
1967 |
EU-ch U18 sf 6768 | C52 Evans Gambit |
| 3. K H Maeder vs Timman |
| 1-0 | 30 |
1967 |
Groningen Ech-jr | C04 French, Tarrasch, Guimard Main line |
| 4. Ujtelky vs K H Maeder |
| ½-½ | 41 |
1969 |
IBM-B | A15 English |
| 5. K H Maeder vs E Scholl |
| 0-1 | 33 |
1969 |
Amsterdam (Netherlands) | C45 Scotch Game |
| 6. J Sloth vs K H Maeder |
| 1-0 | 40 |
1969 |
WchT U26 qual-B | A15 English |
| 7. K H Maeder vs Ribli |
| 1-0 | 29 |
1969 |
Groningen | B33 Sicilian |
| 8. K H Maeder vs Timman |
| 1-0 | 31 |
1969 |
Krefeld DE-NED | B04 Alekhine's Defense, Modern |
| 9. Ribli vs K H Maeder |
| 0-1 | 37 |
1969 |
Groningen | B93 Sicilian, Najdorf, 6.f4 |
| 10. K H Maeder vs C Zuidema |
| ½-½ | 30 |
1969 |
Amsterdam | C52 Evans Gambit |
| 11. K H Maeder vs Joop Piket |
| ½-½ | 13 |
1970 |
Wijk aan Zee | B61 Sicilian, Richter-Rauzer, Larsen Variation, 7.Qd2 |
| 12. K H Maeder vs Ulf Andersson |
 | ½-½ | 10 |
1970 |
Wijk aan Zee | B45 Sicilian, Taimanov |
| 13. G Antunac vs K H Maeder |
| ½-½ | 48 |
1970 |
Wijk aan Zee | B93 Sicilian, Najdorf, 6.f4 |
| 14. L Day vs K H Maeder |
 | 1-0 | 27 |
1970 |
Wijk aan Zee | B23 Sicilian, Closed |
| 15. Estrin vs K H Maeder |
 | 1-0 | 58 |
1978 |
corr-10 WCH | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 16. K H Maeder vs J Boey |
| 0-1 | 47 |
1978 |
corr-10 WCH | C63 Ruy Lopez, Schliemann Defense |
| 17. J Kalish vs K H Maeder |
| ½-½ | 70 |
1978 |
corr-10 WCH | B92 Sicilian, Najdorf, Opocensky Variation |
| 18. W Seeliger vs K H Maeder |
| 0-1 | 26 |
1978 |
corr-10 WCH | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 19. V Palciauskas vs K H Maeder |
| ½-½ | 18 |
1978 |
corr-10 WCH | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 20. K H Maeder vs Kauranen |
| ½-½ | 80 |
1978 |
corr-10 WCH | B33 Sicilian |
| 21. K H Maeder vs K Engel |
| 1-0 | 16 |
1978 |
corr-10 WCH | B16 Caro-Kann, Bronstein-Larsen Variation |
| 22. M Kletsel vs K H Maeder |
| ½-½ | 45 |
1978 |
corr-10 WCH | B92 Sicilian, Najdorf, Opocensky Variation |
| 23. G Sanakoev vs K H Maeder |
 | 0-1 | 64 |
1978 |
corr-10 WCH | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 24. H Sorensen vs K H Maeder |
| 0-1 | 26 |
1978 |
corr-10 WCH | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 25. K H Maeder vs M Govbinder |
| ½-½ | 34 |
1978 |
corr-10 WCH | B97 Sicilian, Najdorf |