Polgár is a Hungarian chess grandmaster and by far the strongest female chess player in history. A prodigy from an early age, she won many youth tournaments competing against boys. In 1991, at the age of 15, Polgár became the youngest grandmaster in history at the time, earning the distinction faster than Bobby Fischer and Garry Kasparov. She later became the first woman to be ranked in the top ten in the world, ranking as high as eighth. What world champions has Polgár defeated? Discuss