| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Welz vs M Vrabec |
| 0-1 | 85 | 1972 | Leipzig SGL Open | B32 Sicilian |
| 2. P Welz vs Z Beil |
| 0-1 | 50 | 1972 | Leipzig SGL Open | B06 Robatsch |
| 3. G Koehler vs P Welz |
| 1-0 | 35 | 1972 | Leipzig SGL Open | A80 Dutch |
| 4. P Welz vs J Tabor |
| 0-1 | 43 | 1972 | Leipzig SGL Open | B32 Sicilian |
| 5. K Lehmann vs P Welz |
| 1-0 | 24 | 1972 | Leipzig SGL Open | A96 Dutch, Classical Variation |
| 6. C Steudtmann vs P Welz |
| ½-½ | 62 | 1972 | Leipzig SGL Open | A83 Dutch, Staunton Gambit |
| 7. S Ruehlemann vs P Welz |
| 1-0 | 67 | 1972 | Leipzig SGL Open | A99 Dutch, Ilyin-Genevsky Variation with b3 |
| 8. P Welz vs M Pape |
| 0-1 | 41 | 1972 | Leipzig SGL Open | B06 Robatsch |
| 9. M Kahn vs P Welz |
| 0-1 | 46 | 1972 | Leipzig SGL Open | A10 English |
| 10. H Rossmann vs P Welz |
| 0-1 | 28 | 1981 | Rostock-B | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 11. P Welz vs M Womacka |
| 0-1 | 48 | 1982 | Rostock-B | B25 Sicilian, Closed |
| 12. P Welz vs A Nickel |
| 0-1 | 38 | 1992 | GER-ch22 corr | B12 Caro-Kann Defense |
| 13. A Kovalev vs P Welz |
| 0-1 | 36 | 1994 | Berliner Sommer | C18 French, Winawer |
| 14. P Welz vs Ewald Henck |
| 1-0 | 39 | 1994 | Berliner Sommer | C00 French Defense |
| 15. D Wiegner vs P Welz |
| 1-0 | 61 | 1994 | Berliner Sommer | C09 French, Tarrasch, Open Variation, Main line |
| 16. P Welz vs L Espig |
| 0-1 | 28 | 1994 | Berliner Sommer | B21 Sicilian, 2.f4 and 2.d4 |
| 17. R Siemes vs P Welz |
| 0-1 | 56 | 1994 | Berliner Sommer | C18 French, Winawer |
| 18. N Krogius vs P Welz |
| 1-0 | 41 | 1994 | Berliner Sommer | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 19. T Hoppe vs P Welz |
| 1-0 | 45 | 1994 | Berliner Sommer | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 20. R Soffer vs P Welz |
| 1-0 | 36 | 1995 | Berliner Sommer | A80 Dutch |
| 21. P Welz vs M Amiri Babaei |
| 1-0 | 26 | 1995 | Berliner Sommer | A07 King's Indian Attack |
| 22. P Welz vs S Shipov |
| 0-1 | 31 | 1996 | Berliner Sommer 14th | A07 King's Indian Attack |
| 23. G Hertneck vs P Welz |
| ½-½ | 56 | 1997 | Wuerzburg op 13th | A81 Dutch |
| 24. P Welz vs H Hofstetter |
| ½-½ | 38 | 1997 | Wuerzburg op 13th | C45 Scotch Game |
| 25. P Welz vs A Breier |
| 0-1 | 31 | 2000 | Kreuzberg | A07 King's Indian Attack |
Kibitzing
