| Jun 14, 2026 | Kurajica | 0–1 | Grieve | Round 6: Kurajica, Bojan - Grieve, Harry | Zukertort Opening | |
| Jun 13, 2026 | Garcia Blanco | ½–½ | Grieve | Round 4: Garcia Blanco, Omar - Grieve, Harry | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Jun 12, 2026 | Grieve | 1–0 | Garcia Padron | Round 3: Grieve, Harry - Garcia Padron, Jose | Ruy Lopez: Closed, Flohr System | |
| Jun 12, 2026 | Hernandez Leon | 0–1 | Grieve | Round 2: Hernandez Leon, Alberto - Grieve, Harry | Queen's Gambit Declined | |
| Jun 11, 2026 | Grieve | ½–½ | Perez Garcia | Round 1: Grieve, Harry - Perez Garcia, Saul | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Jun 10, 2026 | Grieve | 1–0 | Moreno Diepa | Round 5: Grieve, Harry - Moreno Diepa, Diego | French Defense: Advance Variation, Euwe Variation | |
| May 19, 2026 | Mungunzul | 0–1 | Grieve | Round 9: Mungunzul, Bat-Erdene - Grieve, Harry | English Defense | |
| May 18, 2026 | Grieve | 1–0 | Aveskulov | Round 8: Grieve, Harry - Aveskulov, Valeriy | Sicilian Defense: Najdorf Variation | |
| May 18, 2026 | Palczert | 1–0 | Grieve | Round 7: Palczert, Matyas - Grieve, Harry | Sicilian Defense: Four Knights Variation | |
| May 17, 2026 | Grieve | ½–½ | Nagy | Round 6: Grieve, Harry - Nagy, Gabor | Ruy Lopez: Closed, Flohr System | |
| May 16, 2026 | Chinguun | 0–1 | Grieve | Round 5: Chinguun, Sumiya - Grieve, Harry | French Defense: Steinitz Variation, Boleslavsky Variation | |
| May 16, 2026 | Grieve | 1–0 | Ostrovskiy | Round 4: Grieve, Harry - Ostrovskiy, Aleksandr | Ruy Lopez: Fianchetto Defense | |
| May 15, 2026 | Aarav Sinha | ½–½ | Grieve | Round 3: Aarav Sinha - Grieve, Harry | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| May 15, 2026 | Grieve | 1–0 | Berczes | Sixday 2026 May GM-A | Ruy Lopez: Closed, Anti-Marshall | |
| May 14, 2026 | Grieve | 1–0 | Ruzhansky | Sixday 2026 May GM-A | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations | |
| May 4, 2026 | Grieve | ½–½ | Bazakutsa | Round 11: Grieve, Harry - Bazakutsa, Svyatoslav | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| May 3, 2026 | Carroll | 0–1 | Grieve | Round 10: Carroll, Thomas - Grieve, Harry | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 2, 2026 | Grieve | ½–½ | Hobson | Round 9: Grieve, Harry - Hobson, Kenneth | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Apr 6, 2026 | Khachatryan | ½–½ | Grieve | Round 9: Khachatryan, Taron - Grieve, Harry | ? | |
| Apr 6, 2026 | Grieve | ½–½ | Stoettner | Round 8: Grieve, Harry - Stoettner, Moritz | ? | |
| Apr 5, 2026 | Laemmel | * | Grieve | Round 7: Laemmel, Sebastian - Grieve, Harry | ? | |
| Apr 5, 2026 | Grieve | ½–½ | Loos | Round 6: Grieve, Harry - Loos, Roland | ? | |
| Apr 4, 2026 | Yi | 1–0 | Grieve | Round 5: Yi, Danny - Grieve, Harry | ? | |
| Apr 4, 2026 | Grieve | 0–1 | Pranav | Round 4: Grieve, Harry - Pranav, V | ? | |
| Apr 3, 2026 | Duong | 0–1 | Grieve | Round 3: Duong, Quang Bach - Grieve, Harry | ? | |
| Apr 3, 2026 | Ahn | 1–0 | Grieve | Round 1: Ahn, Martin - Grieve, Harry | ? | |
| Apr 3, 2026 | Grieve | 1–0 | Jeitz | Round 2: Grieve, Harry - Jeitz, Christian | ? | |
| Mar 22, 2026 | Nawalaniec | ½–½ | Grieve | Round 8: Nawalaniec, Adam - Grieve, Harry | Sicilian Defense: Four Knights Variation, Cobra Variation | |
| Mar 21, 2026 | Grieve | 0–1 | Fava | Round 7: Grieve, Harry - Fava, Lorenzo | Ruy Lopez: Morphy Defense | |
| Feb 21, 2026 | Grieve | 1–0 | Honarvarmahalati | Round 2: Grieve, Harry - Honarvarmahalati, Hooman | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Feb 19, 2026 | Hunn | 0–1 | Grieve | Round 1: Hunn, David - Grieve, Harry | Queen's Gambit Declined | |
| Feb 8, 2026 | Grieve | 1–0 | Franco | Round 6: Grieve, Harry - Franco, Gaston | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Feb 7, 2026 | Grieve | 1–0 | Ansell | Round 5: Grieve, Harry - Ansell, Simon T | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 11, 2026 | Tan | ½–½ | Grieve | Round 4: Tan, Justin - Grieve, Harry | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jan 10, 2026 | Grieve | ½–½ | Gasanov | Round 3: Grieve, Harry - Gasanov, Eldar | Ruy Lopez: Closed | |
| Dec 30, 2025 | Grieve | 1–0 | Evenshaug | Open rapid/standard chess tournament 27-30 dec | French Defense: Advance Variation, Euwe Variation | |
| Dec 29, 2025 | Carlsson | ½–½ | Grieve | Open rapid/standard chess tournament 27-30 dec | Queen's Gambit Declined: Janowski Variation | |
| Dec 29, 2025 | Grieve | 1–0 | Berg | Open rapid/standard chess tournament 27-30 dec | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Dec 28, 2025 | Seo | ½–½ | Grieve | Open rapid/standard chess tournament 27-30 dec | English Opening: Agincourt Defense | |
| Dec 28, 2025 | Lind | 0–1 | Grieve | Open rapid/standard chess tournament 27-30 dec | King's Pawn Game: Tayler Opening, Inverted Hanham | |
| Dec 27, 2025 | Grieve | 1–0 | Amundsen | Open rapid/standard chess tournament 27-30 dec | Petrov's Defense: Nimzowitsch Attack | |
| Dec 27, 2025 | Grieve | 1–0 | Lindstad | Open rapid/standard chess tournament 27-30 dec | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Dec 27, 2025 | Lindstad | 1–0 | Grieve | Open rapid/standard chess tournament 27-30 dec | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Dec 4, 2025 | Petrov | ½–½ | Grieve | Icelandic team chess championship premier league | Sicilian Defense: Four Knights Variation | |
| Dec 3, 2025 | Grieve | ½–½ | Korshunov | Round 9: Grieve, Harry - Korshunov, Sergey And. | French Defense: Advance Variation, Paulsen Attack | |
| Dec 2, 2025 | Kanyamarala | 1–0 | Grieve | Round 8: Kanyamarala, Tarun - Grieve, Harry | Sicilian Defense: Kramnik Variation | |
| Dec 1, 2025 | Grieve | ½–½ | Tulchynskyi | Round 7: Grieve, Harry - Tulchynskyi, Feliks | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Nov 30, 2025 | Willems | ½–½ | Grieve | Round 6: Willems, Niels - Grieve, Harry | English Opening: Agincourt Defense | |
| Nov 30, 2025 | Grieve | 1–0 | Bhagat Kush | Round 5: Grieve, Harry - Bhagat Kush | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Nov 29, 2025 | Yuffa | 1–0 | Grieve | Round 4: Yuffa, Daniil - Grieve, Harry | Sicilian Defense: French Variation | |
| Nov 28, 2025 | Grieve | 1–0 | Vijayakumar | Round 3: Grieve, Harry - Vijayakumar, Rishi | Italian Game: Paris Defense | |
| Nov 28, 2025 | Coicev | ½–½ | Grieve | Round 2: Coicev, Matei-Andrei - Grieve, Harry | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Nov 27, 2025 | Grieve | 1–0 | Li | Round 1: Grieve, Harry - Li, Harry | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Nov 16, 2025 | Grieve | 1–0 | Heimisson | Icelandic team chess championship premier league | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Nov 15, 2025 | Domalchuk-Jonasson | ½–½ | Grieve | Icelandic team chess championship premier league | King's Indian Attack | |
| Nov 15, 2025 | Grieve | 0–1 | Jakubiec | Icelandic team chess championship premier league | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Nov 14, 2025 | Thybo | 1–0 | Grieve | Icelandic team chess championship premier league | King's Indian Attack | |
| Sep 18, 2025 | Albornoz Cabrera | ½–½ | Grieve | Round 9: Albornoz Cabrera, Carlos Daniel - Grieve, Harry | English Opening: Agincourt Defense, Bogoljubow Defense | |
| Jul 20, 2025 | Grieve | ½–½ | Margarido | CN Equipas 2024-25 | Vienna Game: Falkbeer Variation | |
| Jul 19, 2025 | Petrov | 1–0 | Grieve | CN Equipas 2024-25 | King's Indian Attack | |
| Jul 18, 2025 | Grieve | 1–0 | Iturrizaga Bonelli | CN Equipas 2024-25 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 18, 2025 | Dias | 0–1 | Grieve | CN Equipas 2024-25 | Sicilian Defense: Four Knights Variation | |
| Jul 17, 2025 | Grieve | 1–0 | Martinez Duany | CN Equipas 2024-25 | Ruy Lopez: Closed, Smyslov Defense | |
| Jul 16, 2025 | Galego | ½–½ | Grieve | CN Equipas 2024-25 | Queen's Gambit Declined: Three Knights Variation | |
| Jul 15, 2025 | Grieve | ½–½ | Barria | CN Equipas 2024-25 | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Jul 15, 2025 | Albornoz Cabrera | ½–½ | Grieve | CN Equipas 2024-25 | Sicilian Defense: Four Knights Variation | |
| Jul 14, 2025 | Grieve | ½–½ | Martin Duque | CN Equipas 2024-25 | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Jul 6, 2025 | Grieve | 1–0 | Panelo | I Open Internacional Ciudad de Vitoria - Gazteiz | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Jun 27, 2025 | Martinez Reyes | ½–½ | Grieve | I Open Internacional Ciudad de Vitoria - Gazteiz | King's Indian Attack | |
| Jun 27, 2025 | Grieve | 1–0 | Campos Moreno | I Open Internacional Ciudad de Vitoria - Gazteiz | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 27, 2025 | Moskalenko | ½–½ | Grieve | I Open Internacional Ciudad de Vitoria - Gazteiz | Queen's Gambit Declined: Three Knights Variation | |
| Jun 27, 2025 | Grieve | * | Del Rey | I Open Internacional Ciudad de Vitoria - Gazteiz | Petrov's Defense: Modern Attack | |
| Jun 27, 2025 | Mellado Trivino | 0–1 | Grieve | I Open Internacional Ciudad de Vitoria - Gazteiz | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Jun 27, 2025 | Grieve | 1–0 | Dominguez Exposito | I Open Internacional Ciudad de Vitoria - Gazteiz | French Defense: Advance Variation, Euwe Variation | |
| Jun 27, 2025 | Goitia Tejado | 0–1 | Grieve | I Open Internacional Ciudad de Vitoria - Gazteiz | Sicilian Defense: French Variation, Westerinen Attack | |
| Jun 27, 2025 | Grieve | * | Bravo Freire | I Open Internacional Ciudad de Vitoria - Gazteiz | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Jun 15, 2025 | Grieve | ½–½ | Medina Martin | Round 6: Grieve, Harry - Medina Martin, Alberto | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jun 14, 2025 | Perez Guerra | * | Grieve | Round 5: Perez Guerra, Raul - Grieve, Harry | English Opening: Agincourt Defense | |
| Jun 14, 2025 | Grieve | 1–0 | Kosov | Round 4: Grieve, Harry - Kosov, Alexey | Sicilian Defense: Richter-Rauzer Variation | |
| Jun 13, 2025 | Rodriguez Ferraz | 0–1 | Grieve | Round 3: Rodriguez Ferraz, Borja - Grieve, Harry | Nimzo-Larsen Attack: Classical Variation | |
| Jun 13, 2025 | Grieve | 1–0 | Perez Aleman | Round 2: Grieve, Harry - Perez Aleman, Pedro Tomas | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 12, 2025 | Gonzalez Perdomo | 0–1 | Grieve | Round 1: Gonzalez Perdomo, Sergio - Grieve, Harry | Queen's Pawn Game: Colle System | |
| May 5, 2025 | Grieve | ½–½ | Turner | Round 11: Grieve, Harry - Turner, Matthew J | Ruy Lopez: Closed, Morphy Attack | |
| May 4, 2025 | Berry | 0–1 | Grieve | Round 10: Berry, Neil - Grieve, Harry | Catalan Opening: Open Defense | |
| May 3, 2025 | Hryshchenko | 0–1 | Grieve | Round 9: Hryshchenko, Kamila - Grieve, Harry | Sicilian Defense: Closed | |
| Apr 24, 2025 | Materia | ½–½ | Grieve | Round 9: Materia, Marco - Grieve, Harry | Queen's Gambit Declined: Semi-Tarrasch Defense | |
| Apr 23, 2025 | Grieve | ½–½ | Goldsztejn | Round 8: Grieve, Harry - Goldsztejn, Gildas | Sicilian Defense: Dragon Variation, Yugoslav Attack, Belezky Line | |
| Apr 22, 2025 | Grieve | ½–½ | Moussard | Round 6: Grieve, Harry - Moussard, Jules | Sicilian Defense: Hyperaccelerated Dragon | |
| Apr 22, 2025 | Razafindratsima | 0–1 | Grieve | Round 7: Razafindratsima, Timothe - Grieve, Harry | Sicilian Defense: Four Knights Variation | |
| Apr 21, 2025 | Batsiashvili | 1–0 | Grieve | Round 5: Batsiashvili, Nino - Grieve, Harry | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Apr 20, 2025 | Grieve | 1–0 | Fromm | Round 4: Grieve, Harry - Fromm, Marius | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Apr 20, 2025 | Droin | ½–½ | Grieve | Round 3: Droin, Augustin - Grieve, Harry | Sicilian Defense: Taimanov Variation | |
| Apr 19, 2025 | Grieve | 1–0 | Guichard | Round 2: Grieve, Harry - Guichard, Pauline | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Apr 18, 2025 | Motylev | 1–0 | Grieve | Round 1: Motylev, Alexander - Grieve, Harry | King's Indian Attack | |
| Apr 6, 2025 | Grieve | 1–0 | Badacsonyi | Round 8: Grieve, Harry - Badacsonyi, Frankie | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Apr 5, 2025 | Sowray | ½–½ | Grieve | Round 7: Sowray, Peter J - Grieve, Harry | Rapport-Jobava System | |
| Feb 16, 2025 | Grieve | 1–0 | Camacho Collados | Round 6: Grieve, Harry - Camacho Collados, Jose | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| Feb 15, 2025 | Lentzos | 0–1 | Grieve | Round 5: Lentzos, Ioanis - Grieve, Harry | English Opening: Agincourt Defense | |
| Jan 7, 2025 | Grieve | * | BYE | Roquetas 25 | ? | |
| Jan 6, 2025 | Grieve | ½–½ | Jimenez Fernandez | Roquetas 25 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |