| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. V Petrovskyi vs R G Koellner |
| ½-½ | 34 | 2023 | 50th NRW Cup | C78 Ruy Lopez |
| 52. R G Koellner vs M Saltaev |
| 1-0 | 30 | 2023 | 50th NRW Cup | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 53. A Bagrationi vs R G Koellner |
| 0-1 | 35 | 2023 | 50th NRW Cup | D30 Queen's Gambit Declined |
| 54. R G Koellner vs G Souleidis |
| 1-0 | 51 | 2023 | 50th NRW Cup | D02 Queen's Pawn Game |
| 55. A de Winter vs R G Koellner |
| 1-0 | 37 | 2023 | 50th NRW Cup | C41 Philidor Defense |
| 56. R G Koellner vs V Karthik |
| ½-½ | 49 | 2023 | 50th NRW Cup | D04 Queen's Pawn Game |
| 57. H Besou vs R G Koellner |
| 0-1 | 33 | 2023 | 50th NRW Cup | C64 Ruy Lopez, Classical |
| 58. R G Koellner vs D Wagner |
| ½-½ | 18 | 2023 | 50th NRW Cup | D02 Queen's Pawn Game |
| 59. S Miesen vs R G Koellner |
| 0-1 | 53 | 2023 | FIDE World Rapid Team Championship | A41 Queen's Pawn Game (with ...d6) |
| 60. Grischuk vs R G Koellner |
| 1-0 | 32 | 2023 | FIDE World Rapid Team Championship | D03 Torre Attack (Tartakower Variation) |
| 61. R G Koellner vs N Perossa |
| 1-0 | 60 | 2023 | FIDE World Rapid Team Championship | A46 Queen's Pawn Game |
| 62. Martirosyan vs R G Koellner |
| 1-0 | 64 | 2023 | FIDE World Rapid Team Championship | D37 Queen's Gambit Declined |
| 63. R G Koellner vs B Magana |
| 1-0 | 42 | 2023 | FIDE World Rapid Team Championship | D04 Queen's Pawn Game |
| 64. R G Koellner vs J van Foreest |
| ½-½ | 59 | 2023 | FIDE World Rapid Team Championship | A48 King's Indian |
| 65. B Bellahcene vs R G Koellner |
| 1-0 | 27 | 2023 | FIDE World Rapid Team Championship | B07 Pirc |
| 66. R G Koellner vs Short |
| 0-1 | 32 | 2023 | FIDE World Rapid Team Championship | D05 Queen's Pawn Game |
| 67. Svidler vs R G Koellner |
| 1-0 | 36 | 2023 | FIDE World Rapid Team Championship | C41 Philidor Defense |
| 68. R G Koellner vs T Koch |
| ½-½ | 81 | 2023 | FIDE World Rapid Team Championship | A46 Queen's Pawn Game |
| 69. R G Koellner vs E Zanan |
| 1-0 | 53 | 2023 | FIDE World Rapid Team Championship | D02 Queen's Pawn Game |
| 70. R Rabiega vs R G Koellner |
| ½-½ | 38 | 2023 | FIDE World Rapid Team Championship | B07 Pirc |
| 71. R G Koellner vs E Diaz Gonzalez Jardon |
 | 1-0 | 31 | 2023 | World Junior Championship | D04 Queen's Pawn Game |
| 72. J S Melian vs R G Koellner |
| 0-1 | 49 | 2023 | World Junior Championship | C24 Bishop's Opening |
| 73. R G Koellner vs A Nesterov |
| ½-½ | 41 | 2023 | World Junior Championship | A46 Queen's Pawn Game |
| 74. N Kacharava vs R G Koellner |
| ½-½ | 51 | 2023 | World Junior Championship | C64 Ruy Lopez, Classical |
| 75. R G Koellner vs R Makarian |
| 1-0 | 36 | 2023 | World Junior Championship | D02 Queen's Pawn Game |
Kibitzing
