Stanley Badacsony, from Fortismere School in Muswell Hill, London, won the under-18 category at the Delancey UK Chess Challenge Terafinal, held at Blenheim Palace on October 18 and 19.
It marks his third Terafinal title, having previously won in the under-14 category in both 2023 and 2024.
Stanley is known for his skill in rapid formats and has already beaten professional grandmasters.
He recently competed as part of the English Knightmares team at the FIDE World Rapid and Blitz Team Championships in London.
Jamie Ritblat, founder and executive chairman of Delancey, said: “The Delancey UK Chess Challenge continues to demonstrate how the power of opportunity and education can help young people realise their potential.
“Watching these talented players compete with such focus and creativity is truly inspiring.
“Delancey is proud to support a programme that not only celebrates achievement but also helps nurture the next generation of thinkers and leaders.”
Stanley is part of the Chess Trust’s Accelerator Programme for elite English junior players and has represented England internationally.
He qualified for the Terafinal through the Northern Gigafinal at Wright Robinson College in Manchester.
The Delancey UK Chess Challenge, founded in 1996, is the UK’s largest and longest-running junior chess competition and has introduced more than one million children to competitive chess.
The competition guides players through school stages, Megafinals, Gigafinals, and Challengers before reaching the Terafinal.
Sixty of the UK’s top young players competed across five age categories for the title of UK Chess Challenge Champion 2025.
Games were played on digital boards and broadcast worldwide via Lichess.org.
Sarah Longson, CEO of the Delancey UK Chess Challenge, said: “The Terafinal is the pinnacle of junior chess in the UK – a celebration of months of hard work and a showcase of incredible young talent.
“Every player competing at Blenheim Palace has earned their place through dedication and determination.”
The event awarded more than £5,000 in prizes, along with trophies for the top performers and personalised medals for each finalist.
