| Jul 9, 2025 | Liu | * | Ko Ko Ohn | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Standard | English Opening | |
| Jul 8, 2025 | Sai Han Thiha | 1–0 | Ko Ko Ohn | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Standard | Zukertort Opening: Sicilian Invitation | |
| Jul 5, 2025 | Ko Ko Ohn | 0–1 | Villanueva | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Blitz | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jul 5, 2025 | Ko Ko Ohn | 0–1 | Mangao | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Blitz | Lion Defense: Anti-Philidor, Lion's Cave | |
| Jul 5, 2025 | Ko Ko Ohn | 0–1 | Concio | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Blitz | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jul 5, 2025 | Chernyavsky | 1–0 | Ko Ko Ohn | 1ST BANGKOK SUMMER INTERNATIONAL CHESS OPEN - Standard | Nimzo-Indian Defense: St. Petersburg Variation | |
| May 12, 2025 | Ko Ko Ohn | 1–0 | Habla | ♖5th Big Rook International Chess Festival ♜ ⏳Open | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| May 11, 2025 | Chernyavsky | 1–0 | Ko Ko Ohn | ♖5th Big Rook International Chess Festival ♜ ⏳Open | Catalan Opening | |
| May 10, 2025 | Caparino | 1–0 | Ko Ko Ohn | ♖5th Big Rook International Chess Festival ♜ ⏳Open | Indian Defense: London System | |
| May 9, 2025 | Ko Ko Ohn | 1–0 | Yang | ♖5th Big Rook International Chess Festival ♜ ⏳Open | English Opening: King's English Variation, Two Knights Variation | |
| May 9, 2025 | Ko Ko Ohn | 1–0 | Teo | ♖5th Big Rook International Chess Festival ♜ ⏳Open | Caro-Kann Defense: Advance Variation | |
| May 8, 2025 | Ko Ko Ohn | 0–1 | Batashevs | ♖5th Big Rook International Chess Festival ♜ ⏳Open | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| May 4, 2024 | Badmatsyrenov | 1–0 | Ko Ko Ohn | Round 7: Badmatsyrenov, Oleg - Ko Ko Ohn | Sicilian Defense: Snyder Variation | |
| May 4, 2024 | Causo | 1–0 | Ko Ko Ohn | Round 5: Causo, Deniel - Ko Ko Ohn | Sicilian Defense: Alapin Variation, Barmen Defense | |
| May 4, 2024 | Ko Ko Ohn | 0–1 | Bernadskiy | Round 2: Ko Ko Ohn - Bernadskiy, Vitaliy | French Defense: Two Knights Variation | |
| May 3, 2024 | Ko Ko Ohn | 0–1 | Liem | Round 5: Ko Ko Ohn - Liem, Godwin | Scandinavian Defense: Modern Variation, Gipslis Variation | |
| May 1, 2024 | Badmatsyrenov | 1–0 | Ko Ko Ohn | Round 2: Badmatsyrenov, Oleg - Ko Ko Ohn | Sicilian Defense: Snyder Variation | |
| Feb 26, 2024 | Gutsulyak | ½–½ | Ko Ko Ohn | Round 7: Nikolay Gutsulyak - Ko Ko Ohn | Sicilian Defense: Closed, Traditional | |
| Feb 26, 2024 | Ko Ko Ohn | 0–1 | Louie Salvador | Round 6: Ko Ko Ohn - Louie Salvador | Sicilian Defense: Moscow Variation | |
| Feb 25, 2024 | Daniel Haruma Rolston | 0–1 | Ko Ko Ohn | Round 5: Daniel Haruma Rolston - Ko Ko Ohn | Sicilian Defense: Alapin Variation | |
| Feb 25, 2024 | Ko Ko Ohn | 0–1 | Poompong Wiwatanadate | Round 4: Ko Ko Ohn - Poompong Wiwatanadate | Italian Game: Deutz Gambit | |
| Feb 24, 2024 | Jeremi Nodon | 0–1 | Ko Ko Ohn | Round 3: Jeremi Nodon - Ko Ko Ohn | Nimzo-Indian Defense: Spielmann Variation | |
| Feb 24, 2024 | Ko Ko Ohn | 1–0 | Peter Frost | Round 2: Ko Ko Ohn - Peter Frost | Sicilian Defense: Prins Variation | |
| Feb 23, 2024 | Sirikwan Pinphetsawan | 0–1 | Ko Ko Ohn | Round 1: Sirikwan Pinphetsawan - Ko Ko Ohn | Sicilian Defense: Najdorf Variation | |
| Oct 30, 2022 | Hong | * | Ko Ko Ohn | 20th Bangkok Chess Club Open | ? | |
| Oct 29, 2022 | Ko Ko Ohn | * | Rajesh | 20th Bangkok Chess Club Open | ? | |
| Oct 28, 2022 | Fugal | * | Ko Ko Ohn | 20th Bangkok Chess Club Open | ? | |
| Oct 27, 2022 | Ko Ko Ohn | * | Nisban | 20th Bangkok Chess Club Open | ? | |
| Oct 26, 2022 | Pham | * | Ko Ko Ohn | 20th Bangkok Chess Club Open | ? | |
| Oct 25, 2022 | Ko Ko Ohn | 0–1 | Vaibhav | 20th Bangkok Chess Club Open | Sicilian Defense: Najdorf Variation | |
| — | Ko Ko Ohn | 0–1 | Hong | 2nd The Rooky International Open 2024 ♖♖♖♜♜♖♖♖♜♜♖♖♖ Rapid Open | English Opening: Anglo-Grünfeld Defense | |
| — | Ko Ko Ohn | ½–½ | Mu | 2nd The Rooky International Open 2024 ♖♖♖♜♜♖♖♖♜♜♖♖♖ Rapid Open | Sicilian Defense: Closed | |
| — | Dayal | 1–0 | Ko Ko Ohn | 2nd The Rooky International Open 2024 ♖♖♖♜♜♖♖♖♜♜♖♖♖ Rapid Open | Sicilian Defense: Modern Variations, Main Line | |
| — | Gutsulyak | 0–1 | Ko Ko Ohn | 2nd The Rooky International Open 2024 ♖♖♖♜♜♖♖♖♜♜♖♖♖ Rapid Open | Sicilian Defense: Closed | |
| — | Gordon | 1–0 | Ko Ko Ohn | 22nd Bangkok Chess Club Open 2025 | Queen's Indian Defense: Fianchetto Variation, Rubinstein Variation | |