Privacy

Nothing. ChessMate Central has no accounts, no back end of its own, and no way to send your games anywhere. The analysis runs on your own machine, in your browser, using a chess engine compiled to WebAssembly. A game you paste in never leaves the tab it was pasted into.

So that a position is never analysed twice, and so a half-finished review survives a reload, some things are kept in your browser's own storage. They stay on the device and are readable only by this site:

• Evaluated positions, in an IndexedDB database called chess-insight. This is a cache; deleting it only costs engine time.
• Finished analyses and the last review you ran, in an IndexedDB database called chess-insight-analyses, so a review of forty games does not have to be paid for twice.
• The last chess.com username you searched, in one localStorage key, so the field is not empty next time.

All of it goes when you clear this site's data in your browser. Nothing here is sent anywhere, and no part of it is used to identify you.

When you search for a chess.com username, your browser asks chess.com's public API for that player's public games — the same data anyone can read from their site. That request goes from your browser straight to chess.com; it does not pass through anything of ours, and the response is not stored anywhere except your own browser.

chess.com sees that request the way it sees any visit to its public API. What it does with it is governed by chess.com's privacy policy, not this one. ChessMate Central is not affiliated with chess.com.

Visits are counted, so it is possible to know whether anybody is using this and which pages are worth improving. It runs on Vercel Web Analytics, chosen because it does the job without cookies and without following anyone around.

What it records is a page view: which page, roughly where in the world the request came from, whether it was a phone or a desktop, and which site linked to it. What it does not record is who you are. There is no cookie, no identifier stored on your device, no cross-site tracking, and nothing that could be traced back to a person — which is why you are not being asked to consent to it.

None of it touches your chess. Your games, the analysis, your saved reviews and your solved puzzles never leave your browser, and never appear in any request. A page view says a page was opened; it says nothing about what you did there.

• No session recording, no heatmaps, and no profile of you across visits.
• No advertising, no ad networks, and no ad cookies.
• No cookies at all: the site sets none, and needs none — the visit counting works without them.
• No Google Analytics, no Meta pixel, no third-party trackers or beacons.
• No email address, because there is nothing to sign up for.

The site itself is a set of static files. Whoever serves them to you — a web host, a CDN, your own machine — can see the ordinary things any web server sees: the address of the request, your IP address, your browser's user agent. That is a property of the web rather than of this tool, and it is unrelated to your games, which never appear in any request.

Nothing here identifies anybody, children included. There is no account, no name, no email, and no profile — the visit counting cannot tell one person from another, so there is no age gate because there is nothing to gate.

If this ever changes — if accounts or server-side storage are added — this page will say so before the change ships, with a new date at the top. A policy that quietly grows a data-collection section is not worth reading.