In 1989, at 12, a Jewish-Hungarian schoolgirl named Judit Polgár became the number one female chess player in the world. At 15, Polgár beat Bobby Fischer’s record and became the youngest grandmaster of all time. And at 19, she became the first woman to be ranked in the top 10 of all chess players. Polgár remains the only woman to have done so. A new documentary by the Oscar-nominated director Rory Kennedy (a daughter of Robert F. Kennedy) tells the extraordinary story of Polgár’s early years, in which she and her two sisters, also chess prodigies, were trained by their father to be “geniuses,” and her rise to the highest echelons of the chess world. —Paulina Prosnitz