In 2018, Erdoğmuş won the U-8 category at the 6th
Çeşme International Open Chess Tournament 2018, and won the same age-group category in the 2019 Turkey Youth Chess Championship. He won the U-8
European Chess Championship in 2019, winning all his 8 games and having secured the title before the final round. He attained the International Master title during the 3rd
FIDE Council in 2022, following a commendable performance at the
Svetozar Gligoric Memorial Chess Tournament in
Serbia. The same year, he won the ChessKid Youth Speed Chess Championship online tournament. The following year, at the same tournament, he ranked 9th with 7.5 points in 10 games, while he also participated in advanced training and competitions in 2023. In April 2024, his results at the
Grenke Chess Festival advanced Erdoğmuş to the Grandmaster level, making him the 4th-youngest GM of all time. In May 2024, Erdoğmuş reached a rating of 2569, breaking
Hungarian GM
Judit Polgár's 35-year-old record as the highest ever rated player before the age of 13, while Polgar remained the highest ever ranked 12-year-old. In July 2024, he won both U13 and U16 ChessKid Youth Championship tournaments, while, in October of the same year, he became the youngest player ever to reach a 2600
rating, at the age of 13 years, 3 months and 28 days, beating by nearly a year the previous record, held since 1989 also by Polgar. In May 2025, he tied at 2nd place with Sweden's top GM
Nils Grandelius in the
TePe Sigeman & Co Chess Tournament, and, in July, he faced 49-year-old Russian GM
Peter Svidler in a "Clash of Generations," a match of 6
classical games and 12 blitz games. Erdoğmuş won the classical portion of the match with 4–2 points, scoring 3 victories, while losing heavily in the blitz portion by 2–10 points. The outcome of the match propelled Erdoğmuş to the Top 100 in classical rating at the age of 14, making him the 2nd-youngest player in history to make it at that age into the Top 100, behind only
Judit Polgar who had made it at the age of 12. In the September 2025
FIDE Grand Swiss tournament, held in
Samarkand, he defeated with Black 19-year-old
Indian GM
Aditya Mittal in a game characterized by
Leonard Barden as "immortal." Erdoğmuş allowed his opponent to
promote to a 2nd queen on the board and then sacrificed his own Queen, in a
combination ending with a pawn giving
checkmate in its first move. In the same tournament, he played a 190-move game against
Uzbek GM
Nodirbek Abdusattorov,
drawing a
Queen and pawn versus queen endgame through the
50-move rule. This became the longest game in Grand Swiss history, surpassing the 157-mover Grandelius vs.
Kuzubov from the 10th round in 2021. In the next round, Erdoğmuş played a short 16-move draw against his coach,
Shakhriyar Mamedyarov. Observing the Turkish GM's performance in the Grand Swiss, five-time
world champion Magnus Carlsen commented that "Erdoğmuş is really, really good, at almost unprecedented levels at that age," Following his 8.5/13 performance at the
World Rapid Chess Championship 2025, where he lost to Carlsen in the penultimate round, Carlsen said “Yağız is the best 14-year-old the world has ever seen... We will be hearing a lot about him in the future.” In January 2026, he played in the
Tata Steel Masters, the youngest to ever play in the event at 14. Erdoğmuş performed well, tying for sixth place with a score of 7/13 (+4-3=6). The tournament was convincingly won by
Nodirbek Abdusattorov. ==See also==