Answer
Bobby Fischer held the record for being the youngest Grandmaster in the history of chess, achieving this title at the age of 15 years and 6 months in 1958. However, Judit Polgár, a Hungarian chess prodigy, surpassed this record in 1991 when she became a Grandmaster at the age of 15 years and 4 months, making her the youngest Grandmaster in chess history.