Sion Radamantys Galaviz

Sion Radamantys Galaviz Medina is a Mexican chess grandmaster. Born in the state of Sinaloa, he currently lives in Mérida, Yucatán.

Chess career

In 2022, he took first place in the Alejandro Preve Castro Memorial tournament, finishing ahead of his brother Atlas Adomaitas.
In 2024, he won the gold medal at the CONADE National Games. He represented Mexico at the 45th Chess Olympiad in 2024 in Budapest on board one, scoring 8.5/11 and earning a Grandmaster norm.
He qualified to play in the Chess World Cup 2025. At the event, he was defeated by Luis Paulo Supi in the first round.