| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Guenter Walter vs H U Gruenberg |
| 1-0 | 36 |
1972 |
Goerlitz | A88 Dutch, Leningrad, Main Variation with c6 |
| 2. F Baumbach vs H U Gruenberg |
| ½-½ | 41 |
1972 |
Goerlitz | A88 Dutch, Leningrad, Main Variation with c6 |
| 3. J Lechtynsky vs H U Gruenberg |
| 1-0 | 45 |
1973 |
CSR-DDR | B22 Sicilian, Alapin |
| 4. H U Gruenberg vs W Schmidt |
| ½-½ | 40 |
1973 |
Leipzig DSV | D87 Grunfeld, Exchange |
| 5. Lutikov vs H U Gruenberg |
| 1-0 | 40 |
1973 |
Leipzig DSV | B90 Sicilian, Najdorf |
| 6. H U Gruenberg vs Ribli |
| 0-1 | 37 |
1973 |
Leipzig | A45 Queen's Pawn Game |
| 7. H U Gruenberg vs J Lechtynsky |
| ½-½ | 74 |
1973 |
CSR-DDR | A99 Dutch, Ilyin-Genevsky Variation with b3 |
| 8. H Rossmann vs H U Gruenberg |
| 0-1 | 33 |
1974 |
Potsdam ch-DDR | B05 Alekhine's Defense, Modern |
| 9. H U Gruenberg vs K Litkiewicz |
| 1-0 | 55 |
1974 |
Potsdam ch-DDR | D15 Queen's Gambit Declined Slav |
| 10. C Syre vs H U Gruenberg |
| 1-0 | 29 |
1974 |
Potsdam ch-DDR | E12 Queen's Indian |
| 11. G Moehring vs H U Gruenberg |
| 1-0 | 35 |
1974 |
Potsdam ch-DDR | A36 English |
| 12. Uhlmann vs H U Gruenberg |
| ½-½ | 29 |
1974 |
Potsdam ch-DDR | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 13. L Espig vs H U Gruenberg |
| ½-½ | 29 |
1974 |
Potsdam ch-DDR | A15 English |
| 14. Uhlmann vs H U Gruenberg |
| 1-0 | 26 |
1974 |
DDR | A39 English, Symmetrical, Main line with d4 |
| 15. H U Gruenberg vs B Malich |
 | 0-1 | 20 |
1974 |
Potsdam ch-DDR | E04 Catalan, Open, 5.Nf3 |
| 16. H U Gruenberg vs Vogt |
| ½-½ | 35 |
1974 |
Potsdam ch-DDR | A32 English, Symmetrical Variation |
| 17. H U Gruenberg vs K U Mueller |
| 0-1 | 41 |
1974 |
Potsdam ch-DDR | D63 Queen's Gambit Declined, Orthodox Defense |
| 18. H U Gruenberg vs L Zinn |
| 1-0 | 23 |
1974 |
Potsdam ch-DDR | D50 Queen's Gambit Declined |
| 19. M Bohnisch vs H U Gruenberg |
 | 1-0 | 34 |
1974 |
Potsdam ch-DDR | B20 Sicilian |
| 20. U Boensch vs H U Gruenberg |
| 0-1 | 30 |
1974 |
Potsdam ch-DDR | B24 Sicilian, Closed |
| 21. H U Gruenberg vs D Neukirch |
| ½-½ | 14 |
1974 |
Potsdam ch-DDR | B29 Sicilian, Nimzovich-Rubinstein |
| 22. H Broberg vs H U Gruenberg |
| 0-1 | 40 |
1974 |
Potsdam ch-DDR | B03 Alekhine's Defense |
| 23. R Knaak vs H U Gruenberg |
| 1-0 | 48 |
1974 |
Potsdam ch-DDR | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 24. H U Gruenberg vs T Paehtz Sr |
| 0-1 | 57 |
1974 |
Potsdam ch-DDR | A42 Modern Defense, Averbakh System |
| 25. W Heinig vs H U Gruenberg |
| ½-½ | 14 |
1974 |
Potsdam ch-DDR | A01 Nimzovich-Larsen Attack |