| May 30, 2026 | Mueller | 1–0 | Boroshnev | DEM U12 2026 | Slav Defense: Modern Line | |
| May 29, 2026 | Aguike | ½–½ | Mueller | DEM U12 2026 | Sicilian Defense: Taimanov Variation | |
| May 28, 2026 | Mueller | 1–0 | Marx | DEM U12 2026 | Ruy Lopez: Exchange Variation, King's Bishop Variation | |
| May 27, 2026 | Mueller | 1–0 | Steinbrenner | DEM U12 2026 | Sicilian Defense: Closed | |
| May 26, 2026 | Schmidt | 0–1 | Mueller | DEM U12 2026 | Sicilian Defense: Najdorf Variation, Poisoned Pawn Variation | |
| May 25, 2026 | Mueller | ½–½ | Miatkowski | DEM U12 2026 | Sicilian Defense: Najdorf Variation | |
| May 24, 2026 | Willems | 0–1 | Mueller | DEM U12 2026 | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| May 24, 2026 | Mueller | 1–0 | Katzenstein | DEM U12 2026 | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| May 15, 2026 | Li | 1–0 | Mueller | DEM U12 2026 | Queen's Gambit Accepted: Classical Defense, Alekhine System | |
| May 5, 2026 | Rekhviashvili | 1–0 | Mueller | Round 9: Rekhviashvili, Mariam - Mueller, Konstantin | Sicilian Defense: Alapin Variation, Barmen Defense | |
| May 4, 2026 | Mueller | 0–1 | Svanadze | Round 8: Mueller, Konstantin - Svanadze, Lile | Caro-Kann Defense: Advance Variation, Short Variation | |
| May 3, 2026 | Jakhaia | 1–0 | Mueller | Round 7: Jakhaia, Andria - Mueller, Konstantin | Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Kramnik's Line | |
| May 2, 2026 | Mueller | 1–0 | Hisir | Round 6: Mueller, Konstantin - Hisir, Onur | Owen Defense | |
| Apr 27, 2026 | Saltkhutsishvili | 0–1 | Mueller | Round 1: Saltkhutsishvili, Sara - Mueller, Konstantin | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Apr 23, 2026 | Ivanovic | ½–½ | Mueller | Round 5: Ivanovic, Leonid - Mueller, Konstantin | English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation | |
| Apr 23, 2026 | Mueller | ½–½ | Aker | Round 4: Mueller, Konstantin - Aker, Meric Zeynel | Ruy Lopez: Closed, Chigorin Defense | |
| Apr 23, 2026 | Unsal | 0–1 | Mueller | Round 3: Unsal, Yusuf Kaan - Mueller, Konstantin | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Apr 23, 2026 | Mueller | 1–0 | Huzela | Round 2: Mueller, Konstantin - Huzela, Lukian | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| Mar 29, 2026 | Strehse | 1–0 | Mueller | Runde 4: Strehse, Nelson - Mueller, Konstantin | English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation | |
| Dec 30, 2025 | Mueller | 0–1 | Weihrauch | DVM U20 2025 | Sicilian Defense: Alapin Variation | |
| Dec 29, 2025 | Sabirov | ½–½ | Mueller | DVM U20 2025 | Sicilian Defense: Alapin Variation, Stoltz Attack | |
| Dec 29, 2025 | Mueller | ½–½ | Riechenberg | DVM U20 2025 | Queen's Gambit Declined: Three Knights Variation | |
| Dec 28, 2025 | Melitzki | 0–1 | Mueller | DVM U20 2025 | Sicilian Defense: Najdorf Variation, Zagreb Variation | |
| Dec 28, 2025 | Mueller | ½–½ | Heilig | DVM U20 2025 | Sicilian Defense: Kalashnikov Variation | |
| Dec 27, 2025 | Danninger | ½–½ | Mueller | DVM U20 2025 | East Indian Defense | |
| Dec 27, 2025 | Mueller | 1–0 | von Beckh | DVM U20 2025 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Dec 20, 2025 | Mueller | 0–1 | Asici | Round 9: Mueller, Konstantin - Asici, Poyraz Efe | Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line | |
| Dec 20, 2025 | Xusanov | 1–0 | Mueller | Round 8: Xusanov, Islombek - Mueller, Konstantin | Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | |
| Dec 20, 2025 | Mueller | 1–0 | Kibe | Round 7: Mueller, Konstantin - Kibe, Marten | French Defense: Winawer Variation, Maróczy-Wallis Variation | |
| Dec 20, 2025 | Zhauynbay | 1–0 | Mueller | Round 6: Zhauynbay, Alimzhan - Mueller, Konstantin | Sicilian Defense: Najdorf Variation, Poisoned Pawn Accepted | |
| Dec 19, 2025 | Mueller | 1–0 | Gatin | Round 5: Mueller, Konstantin - Gatin, Artur | Caro-Kann Defense: Tartakower Variation | |
| Dec 19, 2025 | Savran | 1–0 | Mueller | Round 4: Savran, Bora - Mueller, Konstantin | King's Indian Defense: Fianchetto Variation, Larsen Defense | |
| Dec 19, 2025 | Mueller | 1–0 | Shablov | Round 3: Mueller, Konstantin - Shablov, Sergey | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Dec 19, 2025 | Quang Anh Nguyen | 1–0 | Mueller | Round 2: Quang Anh Nguyen - Mueller, Konstantin | Grünfeld Defense: Exchange Variation | |
| Dec 19, 2025 | Mueller | 1–0 | Kalinichenko | Round 1: Mueller, Konstantin - Kalinichenko, German Yu | Benko Gambit Accepted: Fully Accepted Variation | |
| Dec 18, 2025 | Shavkatov | 1–0 | Mueller | Round 9: Shavkatov, Lazizbek - Mueller, Konstantin | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Dec 18, 2025 | Mueller | 0–1 | Uzdemir | Round 8: Mueller, Konstantin - Uzdemir, Ali Poyraz | Benoni Defense: Classical Variation | |
| Dec 18, 2025 | Mueller | 1–0 | Shablov | Round 7: Mueller, Konstantin - Shablov, Sergey | King's Indian Defense: Makogonov Variation | |
| Dec 17, 2025 | Gatin | 0–1 | Mueller | Round 6: Gatin, Artur - Mueller, Konstantin | Bird Opening: Dutch Variation | |
| Dec 17, 2025 | Larion | 1–0 | Mueller | Round 5: Larion, Iustin - Mueller, Konstantin | Sicilian Defense: Moscow Variation | |
| Dec 17, 2025 | Mueller | 1–0 | Cao Kien Binh | Round 4: Mueller, Konstantin - Cao Kien Binh | Sicilian Defense: Najdorf Variation | |
| Dec 16, 2025 | Aynaoglu | ½–½ | Mueller | Round 3: Aynaoglu, Efe - Mueller, Konstantin | Indian Defense: Anti-Grünfeld, Basman-Williams Attack | |
| Dec 16, 2025 | Mueller | 1–0 | Sashin | Round 2: Mueller, Konstantin - Sashin, Ivan | Ruy Lopez: Morphy Defense, Caro Variation | |
| Dec 16, 2025 | Babkin | 1–0 | Mueller | Round 1: Babkin, Timofey Dm - Mueller, Konstantin | Sicilian Defense: French Variation, Westerinen Attack | |
| Nov 7, 2025 | Hurskyi | 0–1 | Mueller | Round 9: Hurskyi, Yan - Mueller, Konstantin | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 6, 2025 | Mueller | 1–0 | Karaboga | Round 8: Mueller, Konstantin - Karaboga, Neset Eren | Sicilian Defense: O'Kelly Variation, Venice System | |
| Nov 4, 2025 | Mueller | 0–1 | Rosca | Round 6: Mueller, Konstantin - Rosca, Dragos-Ioan | Caro-Kann Defense: Advance Variation, Van der Wiel Attack | |
| Nov 2, 2025 | Mueller | 1–0 | Kenar | Round 5: Mueller, Konstantin - Kenar, Ali Alp | Sicilian Defense: Four Knights Variation | |
| Oct 31, 2025 | Juan Miguel | 0–1 | Mueller | Round 3: Juan Miguel, Javier - Mueller, Konstantin | Indian Defense | |
| Oct 30, 2025 | Mueller | 1–0 | Diz Eitor | Round 2: Mueller, Konstantin - Diz Eitor, Noe | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Oct 29, 2025 | Liu | 0–1 | Mueller | Round 1: Liu, Jonas - Mueller, Konstantin | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Oct 27, 2025 | Protopopescu | 1–0 | Mueller | Round 4: Protopopescu, Luca - Mueller, Konstantin | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Oct 18, 2025 | Mueller | 1–0 | Siol | Runde 9: Mueller, Konstantin - Siol, Mats Lennart | Caro-Kann Defense: Exchange Variation | |
| Oct 17, 2025 | Schulz | ½–½ | Mueller | Runde 8: Schulz, Robin - Mueller, Konstantin | Grünfeld Defense: Exchange Variation | |
| Oct 16, 2025 | Mueller | 0–1 | Kaeuper | Runde 7: Mueller, Konstantin - Kaeuper, Johann | Caro-Kann Defense: Tartakower Variation | |
| Oct 15, 2025 | Steenfatt | 0–1 | Mueller | Runde 6: Steenfatt, Niklas - Mueller, Konstantin | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Oct 13, 2025 | Teschler | 1–0 | Mueller | Runde 4: Teschler, Ansgar - Mueller, Konstantin | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Oct 12, 2025 | Mueller | 1–0 | Hipler | Runde 3: Mueller, Konstantin - Hipler, Andreas, Dr. | Caro-Kann Defense: Maróczy Variation | |
| Oct 12, 2025 | Allen | ½–½ | Mueller | Runde 2: Allen, Phillipp - Mueller, Konstantin | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Oct 5, 2025 | Mueller | 1–0 | Voigt | Deutsche Ländermeisterschaft 2025 | Caro-Kann Defense: Tartakower Variation | |
| Oct 4, 2025 | Retzlaff | 0–1 | Mueller | Deutsche Ländermeisterschaft 2025 | Sicilian Defense: Kan Variation | |
| Oct 3, 2025 | Mueller | 1–0 | Ranganathan | Deutsche Ländermeisterschaft 2025 | Caro-Kann Defense: Tartakower Variation | |
| Oct 3, 2025 | Groeschel | 0–1 | Mueller | Deutsche Ländermeisterschaft 2025 | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Oct 2, 2025 | Mueller | 0–1 | Gade | Deutsche Ländermeisterschaft 2025 | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Oct 1, 2025 | Gao | 0–1 | Mueller | Deutsche Ländermeisterschaft 2025 | Queen's Pawn Game: Accelerated London System | |
| Oct 1, 2025 | Mueller | 1–0 | Kopylov | Deutsche Ländermeisterschaft 2025 | Sicilian Defense: Boleslavsky Variation | |
| Jul 24, 2025 | Mueller | 1–0 | Marcenaro | Biel Chess Festival 2025 MTO | Caro-Kann Defense: Tartakower Variation | |
| Jul 23, 2025 | Cervelli | ½–½ | Mueller | Biel Chess Festival 2025 MTO | Sicilian Defense: French Variation | |
| Jul 22, 2025 | Mueller | 0–1 | Aditya Varun Gampa | Biel Chess Festival 2025 MTO | Queen's Gambit Declined: Vienna Variation, Quiet Variation | |
| Jul 21, 2025 | Bai | ½–½ | Mueller | Biel Chess Festival 2025 MTO | Petrov's Defense: Nimzowitsch Attack | |
| Jul 20, 2025 | Mueller | 1–0 | Saxena | Biel Chess Festival 2025 Blitz | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jul 20, 2025 | Vihaan Dumir | 0–1 | Mueller | Biel Chess Festival 2025 Blitz | Trompowsky Attack | |
| Jul 20, 2025 | Mueller | 1–0 | Cordes | Biel Chess Festival 2025 Blitz | Queen's Gambit Accepted: Janowski-Larsen Variation | |
| Jul 20, 2025 | Lappalainen | 1–0 | Mueller | Biel Chess Festival 2025 Blitz | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jul 20, 2025 | Mueller | 0–1 | Tkhoruk | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Tartakower Variation | |
| Jul 20, 2025 | Gut | 1–0 | Mueller | Biel Chess Festival 2025 Blitz | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Jul 20, 2025 | Mueller | 0–1 | Chen | Biel Chess Festival 2025 Blitz | Bogo-Indian Defense: Retreat Variation | |
| Jul 20, 2025 | Dau Khuong Duy | 1–0 | Mueller | Biel Chess Festival 2025 Blitz | Ruy Lopez: Berlin Defense | |
| Jul 20, 2025 | Gao | 0–1 | Mueller | Biel Chess Festival 2025 Blitz | Italian Game: Classical Variation, Giuoco Pianissimo, with h6 | |
| Jul 20, 2025 | Mueller | 1–0 | Lutonins | Biel Chess Festival 2025 Blitz | Benoni Defense: Old Benoni | |
| Jul 20, 2025 | Mueller | 1–0 | Talwalkar | Biel Chess Festival 2025 Blitz | Sicilian Defense: Classical Variation | |
| Jul 20, 2025 | Yash Abhijit Patil | ½–½ | Mueller | Biel Chess Festival 2025 Blitz | King's Indian Attack: Symmetrical Defense | |
| Jul 20, 2025 | Mueller | ½–½ | Gianfrancesco | Biel Chess Festival 2025 Blitz | French Defense: McCutcheon Variation, Lasker Variation | |
| Jul 19, 2025 | Mueller | 1–0 | Hirzel | Biel Chess Festival 2025 MTO | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Jul 18, 2025 | Schultze | 0–1 | Mueller | Biel Chess Festival 2025 MTO | Grünfeld Defense: Exchange Variation | |
| Jul 17, 2025 | Mueller | 0–1 | Harish | Biel Chess Festival 2025 MTO | Bogo-Indian Defense: Vitolins Variation | |
| Jul 16, 2025 | Madsen | 0–1 | Mueller | Biel Chess Festival 2025 MTO | Sicilian Defense: Kramnik Variation | |
| Jul 15, 2025 | Mueller | * | Hoffmann | Biel Chess Festival 2025 MTO | ? | |
| Jul 14, 2025 | Song | 1–0 | Mueller | Biel Chess Festival 2025 MTO | Ruy Lopez: Berlin Defense | |
| Jul 13, 2025 | Rohrer | ½–½ | Mueller | Biel Chess Festival 2025 Rapid | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Jul 13, 2025 | Mueller | 1–0 | Sadeghi | Biel Chess Festival 2025 Rapid | Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation | |
| Jul 13, 2025 | De Gregorio | ½–½ | Mueller | Biel Chess Festival 2025 Rapid | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Jul 13, 2025 | Mueller | 0–1 | Shvedova | Biel Chess Festival 2025 Rapid | Sicilian Defense: Najdorf Variation | |
| Jul 13, 2025 | Drechsler | 0–1 | Mueller | Biel Chess Festival 2025 Rapid | Queen's Pawn Game: Colle System | |
| Jul 13, 2025 | Mueller | 1–0 | Mikavica | Biel Chess Festival 2025 Rapid | Benoni Defense: French Benoni | |
| Jul 13, 2025 | Wuerth | 0–1 | Mueller | Biel Chess Festival 2025 Rapid | Sicilian Defense: Alapin Variation, Stoltz Attack | |
| Jul 13, 2025 | Maier | 1–0 | Mueller | Round 1: Maier, Christian - Mueller, Konstantin | Ruy Lopez: Berlin Defense | |
| Jul 11, 2025 | Mueller | 1–0 | Sahin | Round 7: Mueller, Konstantin - Sahin, Bora | Slav Defense: Exchange Variation, Schallopp Variation | |
| Jul 9, 2025 | Mueller | 1–0 | Mihic | Round 5: Mueller, Konstantin - Mihic, Peter | Italian Game: Scotch Gambit, Max Lange Attack | |
| Jul 8, 2025 | Mueller | 1–0 | Van Dooren | Round 4: Mueller, Konstantin - Van Dooren, Robbe | Sicilian Defense: Hyperaccelerated Fianchetto | |