Answer
Gukesh D, a young Indian chess player, broke Praggnanandhaa's record of defeating Carlsen at the youngest age. Gukesh, who was born in 2006, defeated Carlsen in the 2019 Norway Chess tournament. Praggnanandhaa, who was born in 2005, defeated Carlsen in the 2016 Sinquefield Cup. Gukesh's victory was a major upset, as Carlsen is considered one of the greatest chess players of all time.