| 15 ago 2026 | Karlsson, Stefan 2005 2088 | Akesson, Ralf 2317 | 0-1 | A05 Apertura Zukertort: Nimzo-Larsen Variation | West Coast Chess Open by Mediegymnasiet 2026 | 29 | Ver |
| 15 ago 2026 | Karlsson, Stefan 2005 2088 | Tornberg, Carlos 2172 | 1-0 | A05 Apertura Zukertort: Nimzo-Larsen Variation | West Coast Chess Open by Mediegymnasiet 2026 | 47 | Ver |
| 4 abr 2026 | Lindberg, Bengt 2281 | Karlsson, Stefan 2005 2112 | ½-½ | B23 Defensa Siciliana: Grand Prix Attack | The Paskturneringen 2026 | 79 | Ver |
| 8 mar 2026 | Karlsson, Stefan 2005 2113 | Jaderberg, Bjorn 2059 | 0-1 | A05 Apertura Zukertort: Nimzo-Larsen Variation | Rond 9: Karlsson, Stefan 2005 - Jaderberg, Bjorn | 47 | Ver |
| 18 ene 2026 | Strand, Sixten 2104 | Karlsson, Stefan 2005 2092 | 0-1 | A15 Apertura Inglesa: Anglo-Indian Defense, King's Indian Formation | Rond 6: Strand, Sixten - Karlsson, Stefan 2005 | 57 | Ver |
| 29 nov 2025 | Berling, Egil 2062 | Karlsson, Stefan 2005 2112 | 1-0 | B22 Defensa Siciliana: Alapin Variation, Smith-Morra Declined | Rond 2: Berling, Egil - Karlsson, Stefan 2005 | 54 | Ver |
| 23 nov 2025 | Dingertz, Erik 2093 | Karlsson, Stefan 2005 2112 | 1-0 | D06 Gambito de Dama rehusado: Austrian Defense, Gusev Countergambit | The Juniorallsvenskan 2025, Division I | 38 | Ver |
| 26 sep 2025 | Smith, Axel 2428 | Karlsson, Stefan 2005 2170 | 1-0 | E73 Defensa India de Rey: Semi-Averbakh System | Blixt-SM 2025 | 34 | Ver |
| 26 sep 2025 | Karlsson, Stefan 2005 2170 | Olsson, Linus 2169 | 0-1 | A00 Mieses Opening | Blixt-SM 2025 | 27 | Ver |
| 26 sep 2025 | Iwraeus, Lowe 2092 | Karlsson, Stefan 2005 2170 | 0-1 | D02 Apertura de Peón de Dama: Symmetrical Variation, Pseudo-Catalan | Blixt-SM 2025 | 43 | Ver |
| 26 sep 2025 | Johnson, Daniel 2265 | Karlsson, Stefan 2005 2170 | 1-0 | E80 Defensa India de Rey: Sämisch Variation | Blixt-SM 2025 | 35 | Ver |
| 26 sep 2025 | Karlsson, Stefan 2005 2170 | Fors, Klas 2070 | 1-0 | A05 Ataque Indio de Rey: Wahls Defense | Blixt-SM 2025 | 55 | Ver |
| 26 sep 2025 | Karlsson, Stefan 2005 2170 | Religa, Marek 2289 | 0-1 | A00 Mieses Opening | Blixt-SM 2025 | 36 | Ver |