| 7 feb 2026 | Cardon, Helmut 2280 | Heinert, Eugen 2158 | ½-½ | D11 Defensa Eslava: Quiet Variation, Pin Defense | Dutch Klasse 1B 2025/26 | 36 | Ver |
| 13 dic 2025 | Kooijmans, Jermo 2258 | Cardon, Helmut 2288 | 1-0 | A13 Apertura Inglesa: Agincourt Defense, Catalan Defense Accepted | Dutch Klasse 1B 2025/26 | 24 | Ver |
| 25 oct 2025 | Lindgren, Philip 2385 | Cardon, Helmut 2307 | 1-0 | D44 Defensa Semieslava: Botvinnik Variation | European Chess Club Cup 2025 | Open Matches 17+ | 64 | Ver |
| 22 oct 2025 | Cardon, Helmut 2307 | Stohl, Igor 2394 | 0-1 | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | European Chess Club Cup 2025 | Open Matches 1-16 | 64 | Ver |
| 20 oct 2025 | Bosman, Michiel 2306 | Cardon, Helmut 2307 | ½-½ | D12 Defensa Eslava: Quiet Variation, Schallopp Defense | European Chess Club Cup 2025 | Open Matches 17+ | 136 | Ver |
| 4 oct 2025 | Eerens, Pim 2104 | Cardon, Helmut 2307 | ½-½ | E04 Apertura Catalana: Open Defense | Dutch Klasse 1B 2025/26 | 30 | Ver |