That guy who had the record for the highest points in chess, until this other guy reached higher. He quit chess in the 2000-s. He got beat by a powerful chess-playing supercomputer in the 1990's.
A phrase used against one who says they are an expert at one topic when they get contradicted or proven wrong in that same topic.
1: Video games are not sports, since you do not do any major physical movement while playing, like running or jumping.
2: If it is required to do physical movements, why is chess considered a sport? You don't do any "mayor physical movement" in it.
1: Uh, well...
2: Checkmate, Kasparov.