Antonio Radić

Antonio Radić (born 16 June 1987), better known as agadmator , is a Croatian YouTuber and chess player. He has one of the most popular chess channels on YouTube, and was the most subscribed chess YouTuber from 2018 to late 2021, when he became the first chess content creator to cross the million-subscriber mark. He was eventually surpassed by GothamChess. Although he does not participate in many international chess tournaments, he is active on various online chess platforms, including Lichess and Chess.com. On his channel, Radić reviews recent tournament games from top players, historical matches, and chess compositions. He occasionally features his own real-time rapid games, played on Lichess.

Background Radić is a resident of Križevci, Croatia, and was introduced to chess at the age of four by his grandfather Anto Krnjić, a FIDE Master. He later stopped playing and did not return to chess until he was 17 years old. His most popular video, titled "The Greatest Queen Sacrifice in Chess History", has over 7.5 million views as of August 2025. In the video, he analyzes a game between Rashid Nezhmetdinov and Oleg Chernikov from 1962. On 7 February 2021, he became the first chess content creator to cross the million-subscriber mark.

In 2020, Radić started a podcast called The agadmator Podcast, which is hosted on his YouTube channel and various other platforms. He also has a second channel, "Agadmator's Other Channel", where he plays various video games; namely, Hearthstone and Zelda II: The Adventure of Link.