| Jul 4, 2026 | Tacchino | 0–1 | Mardh | Round 9: Tacchino, Stella - Mardh, William | Sicilian Defense: Modern Variations | |
| Jul 3, 2026 | Mardh | 1–0 | Siljedahl | Round 8: Mardh, William - Siljedahl, Jon | Sicilian Defense: Four Knights Variation | |
| Jul 2, 2026 | Lang Sohl | 0–1 | Mardh | Round 7: Lang Sohl, Benjamin - Mardh, William | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Jul 2, 2026 | Mardh | ½–½ | Thamarai | Round 6: Mardh, William - Thamarai, Yohan | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jun 30, 2026 | Mardh | 1–0 | Cornfors | Round 5: Mardh, William - Cornfors, Theodor | Sicilian Defense: Dragon Variation, Yugoslav Attack, Early Deviations | |
| Jun 30, 2026 | Dahlin | 0–1 | Mardh | Round 4: Dahlin, Emil 2013 - Mardh, William | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Jun 29, 2026 | Modig | 0–1 | Mardh | Round 3: Modig, Ville - Mardh, William | Sicilian Defense: Alapin Variation, Barmen Defense, Central Exchange | |
| Jun 29, 2026 | Mardh | 1–0 | Jiang | Round 2: Mardh, William - Jiang, Fanan | Sicilian Defense | |
| Jun 28, 2026 | Astorga Qviberg | * | Mardh | Round 1: Astorga Qviberg, Emil - Mardh, William | King's Indian Defense: Normal Variation, Rare Defenses | |
| Apr 25, 2026 | Huang | 0–1 | Mardh | Wasa Junior Grand Prix | Sicilian Defense: Alapin Variation | |
| Apr 25, 2026 | Prabu | 0–1 | Mardh | Wasa Junior Grand Prix | Nimzo-Larsen Attack: Modern Variation | |
| Apr 25, 2026 | Mardh | 1–0 | Kruse | Wasa Junior Grand Prix | Ruy Lopez: Berlin Defense, Improved Steinitz Defense | |
| Apr 25, 2026 | Razavi | 0–1 | Mardh | Wasa Junior Grand Prix | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Apr 25, 2026 | Mardh | 1–0 | Jevdjovic | Wasa Junior Grand Prix | Sicilian Defense: Open | |
| Apr 24, 2026 | Mardh | ½–½ | Tharmarai | Wasa Junior Grand Prix | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Apr 24, 2026 | Srinivasson | 1–0 | Mardh | Wasa Junior Grand Prix | Sicilian Defense: Smith-Morra Gambit Declined, Push Variation | |
| Apr 24, 2026 | Mardh | 1–0 | Cui | Wasa Junior Grand Prix | French Defense: Marshall Gambit | |
| Oct 31, 2025 | Magnusson | ½–½ | Mardh | Round 8: Magnusson, Julius - Mardh, William | English Opening: Symmetrical Variation, Full Symmetry Line | |
| Oct 11, 2025 | Mardh | ½–½ | Andreasson | Skol-SM 2025 Kalmar | French Defense: Rubinstein Variation, Blackburne Defense | |