chessophia
Privacy
Which data arise when visiting these pages – and which do not.
This translation is for information only; the German version is binding.
This website is built so that as little data as possible arises: no cookies, no tracking, no analytics tools, no fonts, scripts or pictures from other servers, no contact form and no user accounts. What is processed nevertheless is described here.
1. Controller
Farhad KarimiWorringer Straße 5
50668, Köln
Email: info@chesstoteles.com
2. Hosting and server log files
The website is hosted by STRATO GmbH, Otto-Ostrowski-Straße 7, 10249 Berlin. When the pages are called up, your browser transmits technically necessary data to the server, which can be stored there in log files:
- IP address of the requesting device
- Date and time of access
- page or file called up, amount of data transferred, status code
- previously visited page (referrer), browser and operating system
STRATO anonymizes the IP address already when storing it, so that no conclusion about your person is possible. The data are not merged with other data.
3. Storage in the browser
Some convenience functions remember your settings only locally in your browser. This information is not transmitted to the server or to third parties:
| Entry | Storage | What for |
|---|---|---|
chessophia-design | localStorage | the design chosen (Paper, Owl night or Black and white). Without a choice the site follows the setting of your system, and nothing is stored. |
chessophia-play-speed | localStorage | the speed of the play you chose (settings). |
chessophia-train-solved | localStorage | the positions you solved in the trainer – so that chessophia can show you how far you got. |
chessophia-favorites | localStorage | the positions you marked with the star as favorites (their ids) – so that chessophia can show them to you again. |
chessophia-master-endgameschessophia-deja-vuchessophia-resigned | localStorage | the master endgames and déjà-vu positions you marked with the star. |
chessophia-engine-version | localStorage | Which version of the chess engine Stockfish computes – stored only when a page offers the choice and you choose the full version; chessophia offers no choice at present, nothing is stored. |
chessophia-tutorial-invite | localStorage | that the note about the guide has been shown – so that it appears only once. |
chessophia-pages-1chessophia-files-1 | CacheStorage | copies of the pages and files of chessophia you have opened (service worker) – so they work without the internet and as an app. They are files of this website only, nothing about you; 150 pages at most, the oldest go. |
chessophia-engine-files | CacheStorage | The full version of Stockfish (99 MB), when you have chosen and loaded it – so that it is transmitted only once; chessophia does not offer it at present, nothing is stored. |
chessophia-offline | localStorage | Whether and when you kept chessophia with “Use offline” (version, date, size) – so that what is kept is renewed after the website changed. |
chessophia-offline- | CacheStorage | The pages of chessophia in your language, the small Stockfish and a few thousand positions, if you chose “Use offline” in the settings (the name ends with the version, e.g. -offline-2e0a7057852c). They are only files of this website, nothing about you; to be removed again in the settings. |
Entries in localStorage and in CacheStorage remain stored until you delete them.
The storage serves solely to provide the function you use (§ 25 (2) no. 2 TDDDG). You can delete these data at any time via the settings of your browser (“delete website data”); the pages then keep working, only without remembered settings.
On the analysis board and under “My endgames” you can analyze positions with a chess engine (Stockfish, GPL-3.0). It is loaded from our own server and computes only in your browser; no data is transmitted to us or third parties. In the settings (part “Stockfish”) you choose the version: small (the default, 1.8 MB) or full (99.1 MB, all processor cores but one). The full version is transmitted only when you have chosen it and switch on the engine or load it explicitly in the settings; it is then kept in the storage of your browser (Cache Storage “chessophia-engine-files”, see the table), so it is transmitted only once, and can be removed there at any time. Your choice is kept in localStorage (“chessophia-engine-version”). So that the full version can use several processor cores, our server sends every page with the security headers “Cross-Origin-Opener-Policy” and “Cross-Origin-Embedder-Policy”; they prevent content of other websites from being embedded in our pages and transmit no data.
4. Contact by email
If you write me an email, I process your information (address, content of the message) only to answer your request (Art. 6 (1) (f) GDPR) and delete it as soon as it is no longer needed for that and no statutory retention obligations exist.
5. External links
Some links lead to other websites, such as chesstoteles, chessepolis or Stockfish. Only when you click such a link do you leave these pages; the privacy notices of the respective provider apply there.
6. Your rights
You have the right of access (Art. 15 GDPR), rectification (Art. 16), erasure (Art. 17), restriction of processing (Art. 18), data portability (Art. 20) and objection to processing based on legitimate interests (Art. 21 GDPR). To do so, contact the address given above.
You can also lodge a complaint with a data protection supervisory authority (Art. 77 GDPR), for example the authority of your place of residence or the State Commissioner for Data Protection and Freedom of Information of North Rhine-Westphalia (LDI NRW), Kavalleriestraße 2–4, 40213 Düsseldorf, poststelle@ldi.nrw.de, www.ldi.nrw.de.
As of: October 2026