| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. E Vladimirov vs J Weidemann |
| 1-0 | 31 |
1976 |
W/EU-ch U20 7677 | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 2. J Weidemann vs Huebner |
| 0-1 | 37 |
1976 |
GER-SW chT 7576 | B08 Pirc, Classical |
| 3. Huebner vs J Weidemann |
 | 1-0 | 46 |
1978 |
GER-chT SW 7778 | E19 Queen's Indian, Old Main line, 9.Qxc3 |
| 4. E Lobron vs J Weidemann |
| 1-0 | 41 |
1981 |
BL 8182 Kettig-Frankfurt | A14 English |
| 5. J Weidemann vs P Backwinkel |
| ½-½ | 36 |
1981 |
BL 8182 D,sseldorf-Kettig | B15 Caro-Kann |
| 6. J Weidemann vs K H Goehring |
| 0-1 | 29 |
1981 |
BL 8182 Markth'feld-Kettig | B22 Sicilian, Alapin |
| 7. B Feustel vs J Weidemann |
| 1-0 | 36 |
1981 |
BL 8182 Kettig-Erlangen | A07 King's Indian Attack |
| 8. J Weidemann vs G Siegel |
| 1-0 | 72 |
1982 |
BL 8182 Zahringen-Kettig | B53 Sicilian |
| 9. Hort vs J Weidemann |
| 1-0 | 38 |
1982 |
BL 8182 ;BL | B26 Sicilian, Closed, 6.Be3 |
| 10. Schussler vs J Weidemann |
| ½-½ | 51 |
1982 |
BL 8182 Kettig-Bochum | D11 Queen's Gambit Declined Slav |
| 11. J Weidemann vs W Hartmann |
| 1-0 | 37 |
1982 |
BL 8182 Bamberg-Kettig | B53 Sicilian |
| 12. J Weidemann vs K Juhnke |
| 1-0 | 26 |
1982 |
BL 8182 Delmenhorst-Kettig | B22 Sicilian, Alapin |
| 13. A Westermeier vs J Weidemann |
| ½-½ | 20 |
1982 |
BL 8182 Kettig-Bayern | B34 Sicilian, Accelerated Fianchetto |
| 14. K Wockenfuss vs J Weidemann |
| 1-0 | 38 |
1982 |
BL 8182 Kettig-FH Hamburg | A94 Dutch, Stonewall with Ba3 |
| 15. J Weidemann vs Spassky |
| ½-½ | 15 |
1982 |
BRD-BL Solingen/Kettig | C25 Vienna |
| 16. J Weidemann vs Huebner |
| 0-1 | 42 |
1982 |
BL 8182 HSK-Kettig | B17 Caro-Kann, Steinitz Variation |
| 17. H Hoffmann vs J Weidemann |
| 0-1 | 50 |
1982 |
BL 8182 Kettig-Sindelfingen | B33 Sicilian |
| 18. B Stein vs J Weidemann |
| ½-½ | 37 |
1982 |
BL 8182 Kettig-SKJE | C41 Philidor Defense |
| 19. J Weidemann vs Unzicker |
| 0-1 | 82 |
1983 |
BRD-BL Munich/Kettig | C26 Vienna |
| 20. J Weidemann vs Spassky |
| 1-0 | 58 |
1983 |
BL | B00 Uncommon King's Pawn Opening |
| 21. J Weidemann vs Hort |
| ½-½ | 33 |
1983 |
BL 8283 ;BL | B20 Sicilian |
| 22. J Weidemann vs R Zysk |
| 0-1 | 47 |
1985 |
BRD-BL Munich/Koblenz | C26 Vienna |
| 23. J Weidemann vs E Gueroff |
| 1-0 | 41 |
1985 |
BRD-BL Koblenz/Wuppertal | C26 Vienna |
| 24. Hertneck vs J Weidemann |
| ½-½ | 24 |
1986 |
Bundesliga 8687 | A11 English, Caro-Kann Defensive System |
| 25. J Weidemann vs T Grzesik |
| 1-0 | 32 |
1986 |
BRD-BL BRD | C25 Vienna |