The FIDE Grand Swiss Tournament 2023 was a chess tournament that formed part of the qualification cycle for the World Chess Championship 2024. It was an 11-round Swiss-system tournament with 114 players competing from 25 October to 5 November 2023 in the Isle of Man. The winner and runner-up of the tournament (Vidit Gujrathi and Hikaru Nakamura) earned the right to play in the Candidates Tournament 2024.
The event was held in parallel with the FIDE Women's Grand Swiss Tournament 2023.
The tournament was played with an 11-round Swiss format, with pairings made using the Dutch system for Swiss tournaments.
The games used classical time controls with 100 minutes for the first 40 moves, then 50 minutes for the next 20 moves, then 15 minutes for the rest of the game, with a per-move increment of 30 seconds.
Tie-breaks between players who finished on the same score were determined, in order, by the following tie-breaks:
The tournament ran from 25 October to 5 November 2023 in the Isle of Man, the planned location for the previous Grand Swiss tournament and the location of the inaugural one. Games were played at the Royal Hall of the Villa Marina.
On 25 July, 2023, FIDE announced a preliminary list of 100 confirmed participants. FIDE also stated that the finalized lineup was expected to be available in September and was expected to have 114 players.
Under FIDE regulations, the initial 114 invites were distributed as follows:
Various methods were also specified to replace a player who declined an invitation.
Notation: "0 (B 70)" indicates a loss (0 points) with black pieces (B) against the player who finished 70th (Erwin l'Ami). The first tiebreak (labeled AROC-1) is the average rating of opponents "cut 1" (viz. excluding the lowest-rated opponent), which was sufficient to determine the qualifiers.