This famous video shows Sofia Polgar defeating Korchnoi in a blitz game and then Korchnoi gets angry.
youtube.com/watch?v=M9k5oBgaZGI
The commentators on this video have it all wrong. In first place, Sofia did not say that she has lost respect for him. She said the opposite, that she was afraid that she would lose his respect. (Sofia is a very gracious lady, by the way.) Next, the final position was a dead draw, the well known Lucena Position of Rook and Pawn against Rook, with the king in front of the opposing pawn. Third, the video is an edited composite. At the beginning Sofia has the black pieces but in the final position Sofia has white, so they played at least two games together.
Sam Sloan