| Jun 10, 2026 | Kierzek | ½–½ | Hohler | Round 9: Kierzek, Matthias, Dr. - Hohler, Peter | Bogo-Indian Defense: Grünfeld Variation | |
| Jun 9, 2026 | Algars | 0–1 | Kierzek | Round 8: Algars, Olle - Kierzek, Matthias, Dr. | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jun 8, 2026 | Kierzek | ½–½ | Stoychev | Round 7: Kierzek, Matthias, Dr. - Stoychev, Ognian | Slav Defense: Steiner Variation | |
| Jun 7, 2026 | Gavrish | 1–0 | Kierzek | Round 6: Gavrish, Leonid - Kierzek, Matthias, Dr. | Slav Defense: Exchange Variation | |
| Jun 6, 2026 | Kierzek | 1–0 | Nagy | Round 5: Kierzek, Matthias, Dr. - Nagy, Laszlo | Benoni Defense: Hromádka System | |
| Jun 5, 2026 | Cardili | ½–½ | Kierzek | Round 4: Cardili, Mariano - Kierzek, Matthias, Dr. | Semi-Slav Defense: Moscow Variation | |
| Jun 4, 2026 | Kierzek | 0–1 | Podlesnik | Round 3: Kierzek, Matthias, Dr. - Podlesnik, Bogdan | Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation | |
| Jun 3, 2026 | Badano | 0–1 | Kierzek | Round 2: Badano, Giancarlo - Kierzek, Matthias, Dr. | Caro-Kann Defense: Exchange Variation | |
| Jun 2, 2026 | Kierzek | 1–0 | Boer | Round 1: Kierzek, Matthias, Dr. - Boer, Stefan | King's Pawn Game: Maróczy Defense | |
| Apr 27, 2026 | Kierzek | 0–1 | Ceschia | Round 8: Kierzek, Matthias, Dr. - Ceschia, Ivano | Queen's Gambit Declined: Semi-Tarrasch Defense | |
| Apr 23, 2026 | Giffard | ½–½ | Kierzek | Round 5: Giffard, Nicolas - Kierzek, Matthias, Dr. | Slav Defense: Quiet Variation, Schallopp Defense | |
| Apr 22, 2026 | Kierzek | ½–½ | Littlewood | Round 4: Kierzek, Matthias, Dr. - Littlewood, Paul E | Queen's Gambit Declined: Ragozin Defense | |
| Apr 21, 2026 | Vukovic | 1–0 | Kierzek | Round 3: Vukovic, Zdravko - Kierzek, Matthias, Dr. | Caro-Kann Defense: Apocalypse Attack | |
| Nov 1, 2025 | Kierzek | 0–1 | Binham | Round 11: Kierzek, Matthias, Dr. - Binham, Timothy F. | Benko Gambit Accepted: Modern Variation | |
| Oct 31, 2025 | Sansonetti | 0–1 | Kierzek | Round 10: Sansonetti, Giorgio - Kierzek, Matthias, Dr. | Caro-Kann Defense: Advance Variation, Short Variation | |
| Oct 30, 2025 | Kierzek | 1–0 | Gilbert | Round 9: Kierzek, Matthias, Dr. - Gilbert, Michael A | Benoni Defense: Old Benoni | |
| Oct 29, 2025 | Resika | ½–½ | Kierzek | Round 8: Resika, Nathan - Kierzek, Matthias, Dr. | Réti Opening: Advance Variation | |
| Oct 28, 2025 | Kierzek | 1–0 | Dreke | Round 7: Kierzek, Matthias, Dr. - Dreke, Frank | English Defense | |
| Oct 26, 2025 | Malakhovets | 1–0 | Kierzek | Round 6: Malakhovets, Sergey - Kierzek, Matthias, Dr. | Rapport-Jobava System | |
| Oct 25, 2025 | Kierzek | ½–½ | Carey | Round 5: Kierzek, Matthias, Dr. - Carey, Michael | Benko Gambit Accepted: Modern Variation | |
| Oct 24, 2025 | Bakalar | ½–½ | Kierzek | Round 4: Bakalar, Jan - Kierzek, Matthias, Dr. | Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line | |
| Oct 23, 2025 | Kierzek | 0–1 | Mikhalevski | Round 3: Kierzek, Matthias, Dr. - Mikhalevski, Alexander | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Oct 22, 2025 | Thjomoe | 0–1 | Kierzek | Round 2: Thjomoe, Hans Richard - Kierzek, Matthias, Dr. | Slav Defense | |
| Oct 1, 2025 | Ftacnik | 1–0 | Kierzek | European individual senior chess championship 2025 - Open 65+, Rabac, Croatia | Slav Defense: Czech Variation, Krause Attack | |
| Nov 19, 2024 | Silva | 1–0 | Kierzek | World Senior Chess Championship 2024 | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Nov 18, 2024 | Kierzek | ½–½ | Zapata | World Senior Chess Championship 2024 | Old Indian Defense: Normal Variation | |
| Oct 27, 2024 | Sturua | 1–0 | Kierzek | Round 3: Sturua, Zurab - Kierzek, Matthias, Dr. | English Opening: King's English Variation | |
| Oct 26, 2024 | Kierzek | ½–½ | Ftacnik | Round 2: Kierzek, Matthias, Dr. - Ftacnik, Lubomir | Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Kramnik's Line | |
| Aug 26, 2024 | Kierzek | 0–1 | Roettinger | Round 4: Kierzek, Matthias, Dr. - Roettinger, Eugen | Queen's Gambit Declined: Harrwitz Attack | |
| Aug 23, 2024 | Nemoj | 1–0 | Kierzek | Round 1: Nemoj, Ilja - Kierzek, Matthias, Dr. | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| May 15, 2024 | Popovic | ½–½ | Kierzek | European Senior Team Chess Championship 2024 - Section 65 + | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| May 14, 2024 | Kierzek | ½–½ | Petran | European Senior Team Chess Championship 2024 - Section 65 + | Modern Defense: Averbakh System | |
| May 13, 2024 | Kierzek | ½–½ | Volosin | European Senior Team Chess Championship 2024 - Section 65 + | Queen's Indian Defense: Fianchetto Variation, Traditional Line | |
| May 12, 2024 | Hammar | ½–½ | Kierzek | European Senior Team Chess Championship 2024 - Section 65 + | King's Indian Attack: Keres Variation | |
| May 11, 2024 | Kierzek | 1–0 | James | European Senior Team Chess Championship 2024 - Section 65 + | Bogo-Indian Defense: Grünfeld Variation | |
| May 10, 2024 | Kierzek | ½–½ | Giffard | European Senior Team Chess Championship 2024 - Section 65 + | Queen's Gambit Declined: Cambridge Springs Defense, Yugoslav Variation | |
| May 9, 2024 | Povah | 1–0 | Kierzek | European Senior Team Chess Championship 2024 - Section 65 + | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| May 8, 2024 | Hohler | ½–½ | Kierzek | European Senior Team Chess Championship 2024 - Section 65 + | King's Indian Attack: Keres Variation | |
| May 7, 2024 | Kierzek | 1–0 | Hoebarth | European Senior Team Chess Championship 2024 - Section 65 + | Benoni Defense: Czech Benoni Defense | |
| Oct 26, 2023 | Kierzek | * | Sciupokas | 65+ World Senior Championship | ? | |
| Oct 25, 2023 | Yakimenko | * | Kierzek | 65+ World Senior Championship | ? | |
