Chess on nostr has existed for years. The problem is there is 0 people playing. Also, no way to enforce the rules.

there's a nip for this. i vibed a nostr chess game using it earlier this year if you want to check it out. i vibed it using older google models while checking out antigravity though so it kind of sucks, but at least you can see how i used nip-64. https://github.com/SamSamskies/nostr-chess https://...