| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 76. B Zueger vs G Gruen |
| ½-½ | 16 | 1988 | Berlin Open | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 77. F Braga vs G Gruen |
 | 1-0 | 23 | 1988 | II Trofeo del MEC | A46 Queen's Pawn Game |
| 78. L Christiansen vs G Gruen |
| 1-0 | 39 | 1988 | Bad Mergentheim Open | A46 Queen's Pawn Game |
| 79. G Gruen vs R Boiselle |
| ½-½ | 38 | 1988 | Bad Mergentheim Open | D30 Queen's Gambit Declined |
| 80. G Gruen vs W Haag |
| 0-1 | 27 | 1988 | Bad Mergentheim Open | E67 King's Indian, Fianchetto |
| 81. G Gruen vs P Issing |
| 1-0 | 50 | 1988 | Bad Mergentheim Open | E60 King's Indian Defense |
| 82. G Gruen vs G Kienholz |
| 1-0 | 29 | 1988 | Bad Mergentheim Open | E60 King's Indian Defense |
| 83. H Metz vs G Gruen |
| ½-½ | 18 | 1988 | Schoeneck Open | C36 King's Gambit Accepted, Abbazia Defense |
| 84. G Gruen vs S Reschke |
| ½-½ | 50 | 1988 | Schoeneck Open | E67 King's Indian, Fianchetto |
| 85. G Gruen vs C Garcia Palermo |
| ½-½ | 10 | 1988 | Schoeneck Open | E08 Catalan, Closed |
| 86. L Gutman vs G Gruen |
| 1-0 | 45 | 1988 | Schoeneck Open | E20 Nimzo-Indian |
| 87. G Gruen vs O Bewersdorff |
| 0-1 | 24 | 1988 | Schoeneck Open | D76 Neo-Grunfeld, 6.cd Nxd5, 7.O-O Nb6 |
| 88. B Roeschlau vs G Gruen |
| 0-1 | 42 | 1988 | Schoeneck Open | E11 Bogo-Indian Defense |
| 89. G Gruen vs U Bode |
| 0-1 | 37 | 1988 | Schoeneck Open | E67 King's Indian, Fianchetto |
| 90. P Klings vs G Gruen |
| 0-1 | 36 | 1988 | Schoeneck Open | C64 Ruy Lopez, Classical |
| 91. G Gruen vs H Alber |
| 1-0 | 21 | 1988 | Schoeneck Open | E67 King's Indian, Fianchetto |
| 92. R Blasek vs G Gruen |
| ½-½ | 6 | 1988 | Schoeneck Open | D02 Queen's Pawn Game |
| 93. G Gruen vs H Degenhardt |
| ½-½ | 9 | 1988 | Schoeneck Open | A07 King's Indian Attack |
| 94. G Gruen vs G Barbero |
| 0-1 | 43 | 1988 | GMA-JAT Open | E11 Bogo-Indian Defense |
| 95. G Gruen vs D Gurevich |
| ½-½ | 50 | 1988 | GMA-JAT Open | A62 Benoni, Fianchetto Variation |
| 96. J Ye vs G Gruen |
| 1-0 | 37 | 1988 | GMA-JAT Open | C64 Ruy Lopez, Classical |
| 97. Lputian vs G Gruen |
| 1-0 | 48 | 1988 | GMA-JAT Open | E11 Bogo-Indian Defense |
| 98. G Gruen vs M Markovic |
| 1-0 | 72 | 1988 | GMA-JAT Open | E11 Bogo-Indian Defense |
| 99. G Gruen vs Lobron |
| ½-½ | 63 | 1989 | Bundesliga 1988/89 | A90 Dutch |
| 100. G Gruen vs V Ruehrig |
| ½-½ | 42 | 1989 | Bundesliga 1988/89 | A43 Old Benoni |
Kibitzing
