According to the following video Elon's mother is dead, but this is not confirmed.

Elon Musk has not won a chess match against a world champion. There is no credible evidence or record of him ever playing, let alone defeating, a world chess champion like Magnus Carlsen or any other in a formal or informal match. Claims or videos suggesting otherwise appear to be fictional, satirical, or clickbait, often involving AI-generated content or exaggerated stories. Musk has expressed opinions on chess (e.g., calling it "simple" or predicting it could be solved by AI), but he is not known as a competitive player at that level.