| Jul 24, 2026 | Young | 1–0 | Isaac | 2026 North Shore Club Championship | Lion Defense: Anti-Philidor, Lion's Cave | |
| Jul 19, 2026 | Preiss | 0–1 | Isaac | New Zealand Seniors Chess Championship 2026 | Philidor Defense: Lion Variation | |
| Jul 18, 2026 | Isaac | ½–½ | Beach | New Zealand Seniors Chess Championship 2026 | Zukertort Opening: Dutch Variation | |
| Jul 18, 2026 | Isaac | 1–0 | Park-Tamati | 2026 North Shore Club Championship | Yusupov-Rubinstein System | |
| Jul 18, 2026 | Isaac | * | Smith | New Zealand Seniors Chess Championship 2026 | ? | |
| Jul 18, 2026 | Johnson | 1–0 | Isaac | New Zealand Seniors Chess Championship 2026 | Indian Defense: Wade-Tartakower Defense | |
| Jul 12, 2026 | Park-Tamati | 1–0 | Isaac | Round 6: Park-Tamati, Philli - Isaac, Ceferino | Pirc Defense | |
| Jul 11, 2026 | Isaac | 1–0 | Nazeer | Round 4: Isaac, Ceferino - Nazeer, Afique M | Zukertort Opening: Sicilian Invitation | |
| Jul 10, 2026 | Isaac | 1–0 | Chan | Round 3: Isaac, Ceferino - Chan, Chi Ngo | London System | |
| Jul 10, 2026 | Sun | 1–0 | Isaac | Round 2: Sun, Oliver - Isaac, Ceferino | Old Indian Defense | |
| Jul 10, 2026 | McLaren | 1–0 | Isaac | Round 1: McLaren, Leonard J - Isaac, Ceferino | Pirc Defense | |
| Jul 5, 2026 | Garland | 0–1 | Isaac | 2026 North Shore Club Championship | Queen's Pawn Game | |
| Jun 26, 2026 | Isaac | 0–1 | Le Brocq | 2026 North Shore Club Championship | Zukertort Opening: Sicilian Invitation | |
| Jun 20, 2026 | Hu | 0–1 | Isaac | 2026 North Shore Club Championship | Pirc Defense | |
| May 15, 2026 | Han | 0–1 | Isaac | 2026 NSCC Autumn Tournament | Pirc Defense | |
| May 7, 2026 | Isaac | 1–0 | Schrader | 2026 NSCC Autumn Tournament | Queen's Pawn Game: Chigorin Variation | |
| Mar 12, 2026 | Le Brocq | ½–½ | Isaac | 2026 NSCC Summer Cup | Czech Defense | |
| Mar 5, 2026 | Isaac | 1–0 | Aravindkumar | 2026 NSCC Summer Cup | Queen's Pawn Game: Chigorin Variation | |
| Feb 26, 2026 | Korolev | 1–0 | Isaac | 2026 NSCC Summer Cup | Pirc Defense | |
| Feb 19, 2026 | Isaac | ½–½ | Zeng | 2026 NSCC Summer Cup | Réti Opening: Réti Accepted | |
| Feb 12, 2026 | Rehansi | ½–½ | Isaac | 2026 NSCC Summer Cup | Czech Defense | |
| Feb 6, 2026 | Isaac | 0–1 | Zhang | 2026 NSCC Summer Cup | King's Indian Attack: Symmetrical Defense | |
| Jan 29, 2026 | Moshakova | 0–1 | Isaac | 2026 NSCC Summer Cup | Czech Defense | |
| Jul 24, 2025 | Nimmakayala | ½–½ | Isaac | 2025 North Shore Club Championship | Rat Defense: English Rat | |
| Jul 16, 2025 | Isaac | 1–0 | Xiang | 2025 North Shore Club Championship | Queen's Pawn Game: Symmetrical Variation | |
| Jul 10, 2025 | Ayaan Bhatia | 0–1 | Isaac | 2025 North Shore Club Championship | Nimzo-Larsen Attack | |
| Jun 26, 2025 | Isaac | ½–½ | Wang | 2025 North Shore Club Championship | Zukertort Opening | |
| Jun 22, 2025 | Hwang | ½–½ | Isaac | Peter Stuart Memorial Open 2025 | Pirc Defense | |
| Jun 21, 2025 | Isaac | 0–1 | Tew | Peter Stuart Memorial Open 2025 | Zukertort Opening | |
| Jun 21, 2025 | Young | 0–1 | Isaac | Peter Stuart Memorial Open 2025 | Modern Defense: Pseudo-Austrian Attack | |
| Jun 20, 2025 | Isaac | ½–½ | Braganza | Peter Stuart Memorial Open 2025 | Zukertort Opening | |
| Jun 20, 2025 | Powlesland | 0–1 | Isaac | Peter Stuart Memorial Open 2025 | Rat Defense: English Rat | |
| Jun 19, 2025 | Isaac | 0–1 | Mao | Peter Stuart Memorial Open 2025 | Zukertort Opening | |
| Jun 19, 2025 | Sussex | 1–0 | Isaac | 2025 North Shore Club Championship | Modern Defense: Standard Line | |
| May 22, 2025 | Isaac | ½–½ | Truong | 2025 NSCC Autumn Tournament | Zukertort Opening: Sicilian Invitation | |
| May 14, 2025 | Holland | ½–½ | Isaac | 2025 NSCC Autumn Tournament | Sicilian Defense: Hyperaccelerated Fianchetto | |
| May 11, 2025 | Isaac | 0–1 | Guo | 2025 NSCC Autumn Tournament | Zukertort Opening: Queen's Gambit Invitation | |
| May 11, 2025 | McDonald | 0–1 | Isaac | 2025 NSCC Autumn Tournament | Modern Defense: Modern Pterodactyl | |
| — | Isaac | 1–0 | Jiang | 2025 North Shore Club Championship | Zukertort Opening: Dutch Variation | |
| — | Isaac | 0–1 | Wang | 2025 North Shore Club Championship | Zukertort Opening: Queen's Gambit Invitation | |
| — | Wang | ½–½ | Isaac | 2025 North Shore Club Championship | English Opening | |