Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates.

Live chess tournament results and up-to-date player ratings in chat.

Mods for Claude Code. effortless picks the reasoning effort for every prompt and shows the cache countdown. textless (desktop app) shows art, quotes and chess instead of the wall of text while Claude works.

Enables an AI assistant to convert PDF and EPUB chess books into faithful PGN by reading pages and diagrams, validating moves with python-chess, preserving variations and commentary, and reporting verifiable issues.