| Jun 27, 2026 | Okubo | 1–0 | Evan De Wet | Round 11: Okubo, Sui - Evan De Wet | Italian Game: Giuoco Pianissimo | |
| Jun 26, 2026 | Danielyan | 1–0 | Okubo | Round 10: Danielyan, Aram - Okubo, Sui | Scotch Game: Classical Variation | |
| Jun 25, 2026 | Okubo | 0–1 | Ramanathan | Round 9: Okubo, Sui - Ramanathan, Ekalaivan | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jun 24, 2026 | Okubo | 1–0 | Shcherbatykh | Round 8: Okubo, Sui - Shcherbatykh, Kirian | Pirc Defense: Classical Variation | |
| Jun 23, 2026 | Nikoloz Mzhavanadze | ½–½ | Okubo | FIDE World Cadets Cup, O08 / B20-58 | Italian Game: Classical Variation, Greco Gambit, Anderssen Variation | |
| Jun 21, 2026 | Okubo | ½–½ | Iskhak Esenkabylov | Round 6: Okubo, Sui - Iskhak Esenkabylov | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jun 20, 2026 | Novak | 1–0 | Okubo | Round 5: Novak, Lev Aleks - Okubo, Sui | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jun 19, 2026 | Okubo | 0–1 | Magomedov | Round 4: Okubo, Sui - Magomedov, Adam | French Defense: Advance Variation, Milner-Barry Gambit | |
| Jun 18, 2026 | Do | ½–½ | Okubo | Round 3: Do, Yoonwoo - Okubo, Sui | Italian Game: Evans Gambit, Anderssen Variation, Cordel Line | |
| Jun 17, 2026 | Okubo | 1–0 | Onise Chitaia | Round 2: Okubo, Sui - Onise Chitaia | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Jun 16, 2026 | Nikoloz Mtchedlidze | ½–½ | Okubo | Round 1: Nikoloz Mtchedlidze - Okubo, Sui | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| — | Okubo | 0–1 | Liu | Asian Amateur Chess Competition 2025 | French Defense: Exchange Variation | |
| — | Okubo | ½–½ | Wu | Asian Amateur Chess Competition 2025 | Caro-Kann Defense: Tartakower Variation | |
| — | Okubo | 0–1 | Lee | Asian Amateur Chess Competition 2025 | Pirc Defense: Classical Variation | |
| — | Okubo | 1–0 | Nethi | Asian Amateur Chess Competition 2025 | Italian Game: Hungarian Defense | |
| — | Su | 1–0 | Okubo | Asian Amateur Chess Competition 2025 | Queen's Gambit Declined: Ragozin Defense | |
| — | Leung | 1–0 | Okubo | Asian Amateur Chess Competition 2025 | Italian Game: Classical Variation, Greco Gambit, Traditional Line | |
| — | Wong | 1–0 | Okubo | Asian Amateur Chess Competition 2025 | King's Knight Opening: Konstantinopolsky | |
| — | Chan | 0–1 | Okubo | Asian Amateur Chess Competition 2025 | King's Gambit | |
| — | Wong | 0–1 | Okubo | Asian Amateur Chess Competition 2025 | Queen's Pawn Game: Accelerated London System | |
