The Rise of the Polgar Sisters
Susan, Sofia, and Judit Polgar were raised under an explicit experiment devised by their father, László Polgar, to prove that great players are made through deliberate early training, not born with innate genius. All three sisters reached elite competitive chess. Judit became the strongest female player in history; Susan became the first woman to earn the men's Grandmaster title; Sofia produced one of the most dominant single-tournament performances by a teenager in chess history.
The experiment itself
László Polgar believed, and set out deliberately to demonstrate, that genius is a product of early, intensive, specialised training rather than innate talent, and chess, with its clear, measurable results, was his chosen proving ground. All three daughters were home-schooled with chess as a central subject from early childhood, an approach that was controversial at the time and remains debated today.
Susan: breaking the first barriers
The eldest sister, Susan (born 1969), became the first woman ever to qualify for the "Men's" World Championship cycle in 1986, and later, in 1991, the first woman to earn the Grandmaster title through the standard men's title system rather than a women's-specific route. Her own fight to actually be allowed to play in the events she qualified for is a story in its own right, covered in full here.
Sofia: one tournament, one legend
The middle sister, Sofia (born 1974), is remembered above all for a single, historic result: an 8.5/9 performance at the Magistroni Open in Rome in 1989, at just 14 years old, a run so dominant it is still referred to in chess circles simply as "Sofia's Sac," a tournament performance rating that stunned a field of far more experienced titled players.
Judit: the strongest of all three
The youngest sister, Judit (born 1976), broke Bobby Fischer's record as the youngest player ever to earn the Grandmaster title, and went on to become, by a wide margin, the strongest female chess player in history, peaking inside the world's overall top 10. Her defining wins and controversies, the 1994 Kasparov touch-move dispute and her historic 2002 win over the world No. 1, are covered in full in our touch-move piece and our 2002 upset coverage.
What the experiment actually proved
Whether or not "genius is made, not born" is universally true, the Polgar sisters' results are the single strongest data point anyone has ever produced in its favour: three children, one deliberate training method, three elite competitive careers. A Netflix documentary on Judit's career, released in February 2026, has brought fresh attention to the whole family's story, covered in our companion piece.