Defending champion Fabiano Caruana defeated Praggnanandhaa Rameshbabu in the first classical game of the Grand Chess Tour Finals on Tuesday, earning six points.
The match turned on move 28 when Praggnanandhaa committed a tactical error with 28...Rc8?, allowing Caruana to win a pawn and convert the advantage into a victory.
The two players are scheduled to compete in a second classical game on Wednesday, followed by the concluding rapid and blitz sections on Thursday to determine the title winner.