In the eighth round of the competition, Tabatabaei, with a rating of 2692, drew with his Indian opponent Gukesh Dommaraju with a rating of 2720.
Previously, Tabatabaei drew with his American opponent Hans Niemann with a rating of 2667 and defeated his opponent from England Nikita Vitiugov with a rating of 2704.
Tabatabaei will face his opponent from France Jules Moussard in the final.
The 13th edition of the London Chess Classic is taking place on December 1-10 as a 10-player single round-robin with a classical time control.
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