| Jul 19, 2026 | Wilhelm | 0–1 | Filimonov | Round 13: Wilhelm, Serge - Filimonov, Arsenii | King's Indian Attack: Wahls Defense | |
| Jul 19, 2026 | Wilhelm | 0–1 | Bucher | Round 11: Wilhelm, Serge - Bucher, Dominic | King's Indian Attack, with e6 | |
| Jul 19, 2026 | Tahari | 1–0 | Wilhelm | Round 10: Tahari, Youcef Nazim - Wilhelm, Serge | Caro-Kann Defense: Maróczy Variation | |
| Jul 19, 2026 | Pinelli | 1–0 | Wilhelm | Round 8: Pinelli, Gian - Wilhelm, Serge | Nimzo-Indian Defense: Classical Variation, Berlin Variation | |
| Jul 19, 2026 | Wilhelm | 0–1 | Kolly | Round 7: Wilhelm, Serge - Kolly, Jacques | Zukertort Opening: Queen's Gambit Invitation | |
| Jul 19, 2026 | Klatt | ½–½ | Wilhelm | Round 6: Klatt, Marcel - Wilhelm, Serge | Caro-Kann Defense: Advance Variation | |
| Jul 19, 2026 | Wilhelm | 1–0 | Kamildjanov | Round 5: Wilhelm, Serge - Kamildjanov, Saidbek | Zukertort Opening: Black Mustang Defense | |
| Jul 19, 2026 | Hakimifard | 1–0 | Wilhelm | Round 4: Hakimifard, Ghazal - Wilhelm, Serge | Caro-Kann Defense: Main Line | |
| Jul 19, 2026 | Fernandes Barbosa Dos Santos | 1–0 | Wilhelm | Round 2: Fernandes Barbosa Dos Santos, Gabriel - Wilhelm, Serge | Caro-Kann Defense: Tartakower Variation | |
| Jul 12, 2026 | Mueller | 0–1 | Wilhelm | Round 9: Mueller, Ladina - Wilhelm, Serge | English Opening: Anglo-Indian Defense | |
| Jul 12, 2026 | Wilhelm | 0–1 | Carey | Round 8: Wilhelm, Serge - Carey, Michael | Zukertort Opening: Sicilian Invitation | |
| Jul 12, 2026 | Rohrer | 1–0 | Wilhelm | Round 7: Rohrer, Christophe - Wilhelm, Serge | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 12, 2026 | Wilhelm | 1–0 | Bachmann | Round 6: Wilhelm, Serge - Bachmann, Daniel | King's Indian Attack | |
| Jul 12, 2026 | Pinelli | ½–½ | Wilhelm | Round 5: Pinelli, Gian - Wilhelm, Serge | Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation | |
| Jul 12, 2026 | Wilhelm | ½–½ | Huang | Round 4: Wilhelm, Serge - Huang,Hsuan-Chen | King's Indian Attack | |
| Jul 12, 2026 | Martin | 0–1 | Wilhelm | Round 3: Martin, Gerome - Wilhelm, Serge | Caro-Kann Defense: Maróczy Variation | |
| Jul 12, 2026 | Wilhelm | 0–1 | Arjun Kalyan | Round 2: Wilhelm, Serge - Arjun Kalyan | King's Indian Attack: Keres Variation | |
| Jul 31, 2025 | Wilhelm | ½–½ | Schulze | Round 1: Wilhelm, Serge - Schulze, Lara | Trompowsky Attack | |
| Jul 20, 2025 | Gauthey | ½–½ | Wilhelm | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Accelerated Panov Attack, Open Variation | |
| Jul 20, 2025 | Wilhelm | ½–½ | Zumbrunn | Biel Chess Festival 2025 Blitz | Trompowsky Attack | |
| Jul 20, 2025 | Ye | 0–1 | Wilhelm | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Advance Variation, Van der Wiel Attack | |
| Jul 20, 2025 | Yu | 1–0 | Wilhelm | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jul 20, 2025 | Wilhelm | 0–1 | Jelicic | Biel Chess Festival 2025 Blitz | Rapport-Jobava System, with e6 | |
| Jul 20, 2025 | Borisyuk | 1–0 | Wilhelm | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Exchange Variation | |
| Jul 20, 2025 | Wilhelm | 0–1 | Muheim | Biel Chess Festival 2025 Blitz | Trompowsky Attack | |
| Jul 20, 2025 | Wilhelm | 1–0 | Dalay | Biel Chess Festival 2025 Blitz | Rapport-Jobava System | |
| Jul 20, 2025 | Rappazzo | 1–0 | Wilhelm | Biel Chess Festival 2025 Blitz | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jul 20, 2025 | Schneggenburger | 0–1 | Wilhelm | Biel Chess Festival 2025 Blitz | English Opening | |
| Jul 20, 2025 | Wilhelm | 0–1 | Quilter | Biel Chess Festival 2025 Blitz | Trompowsky Attack | |
| Jul 13, 2025 | Lang | ½–½ | Wilhelm | Biel Chess Festival 2025 Rapid | Yusupov-Rubinstein System | |
| Jul 13, 2025 | Wilhelm | 1–0 | Moesching | Biel Chess Festival 2025 Rapid | Trompowsky Attack | |
| Jul 13, 2025 | Haag | 0–1 | Wilhelm | Biel Chess Festival 2025 Rapid | Queen's Indian Defense: Classical Variation, Tiviakov Defense | |
| Jul 13, 2025 | von Burg | 1–0 | Wilhelm | Biel Chess Festival 2025 Rapid | Catalan Opening | |
| Jul 13, 2025 | Wilhelm | 0–1 | Boyer | Biel Chess Festival 2025 Rapid | Queen's Pawn Game: Chigorin Variation | |
| Jul 13, 2025 | Boillat | ½–½ | Wilhelm | Biel Chess Festival 2025 Rapid | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jul 13, 2025 | Wilhelm | 0–1 | Banh Gia Huy | Biel Chess Festival 2025 Rapid | Trompowsky Attack | |
| Jul 21, 2024 | Wilhelm | 0–1 | Sethuraman | Biel Chess Festival BTZ | Trompowsky Attack | |
| Jul 21, 2024 | Wilhelm | ½–½ | Tahay | Biel Chess Festival BTZ | Trompowsky Attack | |
| Jul 21, 2024 | Wilhelm | 0–1 | Angst | Biel Chess Festival BTZ | English Defense | |
| Jul 21, 2024 | Wilhelm | 0–1 | Vardi | Biel Chess Festival BTZ | Pirc Defense | |
| Jul 21, 2024 | Wilhelm | 1–0 | Noh | Biel Chess Festival BTZ | Trompowsky Attack | |
| Jul 21, 2024 | Wilhelm | ½–½ | Alberti | Biel Chess Festival BTZ | Trompowsky Attack: Classical Defense, Big Center Variation | |
| Jul 21, 2024 | Kaletsch | 0–1 | Wilhelm | Biel Chess Festival BTZ | Queen's Indian Defense: Miles Variation | |
| Jul 21, 2024 | Zumbrunn | 0–1 | Wilhelm | Biel Chess Festival BTZ | Caro-Kann Defense: Exchange Variation | |
| Jul 21, 2024 | Tkhoruk | 1–0 | Wilhelm | Biel Chess Festival BTZ | Torre Attack: Classical Defense | |
| Jul 21, 2024 | Akhmediyar | 1–0 | Wilhelm | Biel Chess Festival BTZ | English Opening: Mikenas-Carls Variation | |
| Jul 21, 2024 | Borisyuk | 1–0 | Wilhelm | Biel Chess Festival BTZ | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jul 14, 2024 | Wilhelm | 1–0 | Amsellen | Biel Chess Festival RAP | Queen's Pawn Game: Colle System | |
| Jul 14, 2024 | Wilhelm | 1–0 | Wild | Biel Chess Festival RAP | Queen's Pawn Game: Zukertort Variation | |
| Jul 14, 2024 | Wilhelm | 0–1 | Arcuti | Biel Chess Festival RAP | Trompowsky Attack | |
| Jul 14, 2024 | Wilhelm | 1–0 | Paholok | Biel Chess Festival RAP | Modern Defense: Standard Defense | |
| Jul 14, 2024 | Wilhelm | 1–0 | Wolffs | Biel Chess Festival RAP | Trompowsky Attack | |
| Jul 14, 2024 | Kersten | 1–0 | Wilhelm | Biel Chess Festival RAP | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jul 14, 2024 | Chappaz | 1–0 | Wilhelm | Biel Chess Festival RAP | King's Indian Attack | |
| Jul 14, 2024 | Boner | 0–1 | Wilhelm | Biel Chess Festival RAP | Caro-Kann Defense | |
| Jul 14, 2024 | Toktomushev | 1–0 | Wilhelm | Biel Chess Festival RAP | Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line | |
| May 9, 2024 | Wilhelm | 0–1 | Joie | Bundesturnier | Horwitz Defense | |