This NIP is not yet in main. Here is an overview of PRs referencing this NIP. 
format(all): JSON formatting MERGED @kehiy
style: fix header styles in same format MERGED @kehiy
NIP-64 - Trust Score CLOSED @arthurfranca
Wikilink tags and Trust Rank NIP (and how to apply it to wikis) CLOSED @arthurfranca
nip-64: inbox model OPEN @fiatjaf
NIP-64: Chess (Portable Game Notation) MERGED @theborakompanioni
NIP-64: Chess (WIP) CLOSED @theborakompanioni