Alireza Firouzja has won the Sinquefield Cup unbeaten, with a total of 6/9 points.
He finished half a point ahead of the US champion and world No 3, Fabiano Caruana.
What happened at the Sinquefield Cup?
The prestigious event, named after the chess benefactor Rex Sinquefield, is one of the game’s three elite super-tournaments.
Alireza Firouzja's victory was significant, given his recent struggles in the 2022 and 2024 Candidates.
Why it matters for Alireza Firouzja
Firouzja's win marks a turnaround in his career, after he seemed destined for a quick journey to the top, but then experienced failures and a drop in the world rankings.
He has made significant changes to his lifestyle, including cutting back on blitz and bullet games, and arriving at the board with well-prepared openings.
What comes next for Alireza Firouzja?
Firouzja's world ranking has jumped back up to No 5, after his victory at the Sinquefield Cup.
He defeated the world champion, Ding Liren, in a tense and complex game, and has now beaten him four times in their last five meetings.
The tournament also saw India's 18-year-old Gukesh Dommaraju draw every game, but still show himself to be a master of defence.
Firouzja's victory at the Sinquefield Cup is a significant step forward in his career, and he will look to build on this momentum in future tournaments.
He will face tough competition, including Magnus Carlsen, Norway's world No 1, who holds the rapid and blitz titles.
The Fide’s annual World Rapid and Blitz championships will be staged on Wall Street, New York, on 26-31 December, and will feature a strong field of competitors.
Alireza Firouzja's recent form suggests he could be a contender for these titles, and he will look to continue his upward trajectory in the world rankings.