Only if you tick "Record this game" before a game:
We do not store IP addresses, and use no cookies, analytics or advertising. The site runs on Cloudflare, which keeps its own short-lived request logs.
To measure how strong the bots are against people, and how people's moves differ from the bots'. Results may be published in aggregate, never game by game with your ID.
Untick the box and nothing is sent. To have your games deleted, write to CONTACT quoting your player ID:
(none: nothing recorded from this browser)
Games are kept for up to five years.