Terms & Privacy

This page covers the terms under which CHA-Solver is offered and what chasolver.org does with your data. The short version: CHA-Solver is free and open source, provided as is, and the site collects almost nothing about you.

Last updated 30 June 2026

The algorithm

• CHA-Solver analyzes whether a chess position can still be won. Its verdicts are provided for informational purposes only, without any warranty of correctness or fitness for a particular purpose.
• The algorithm is free software, released under the MIT License. You are welcome to read, audit, and reuse the code on GitHub.
• It is provided "as is". To the maximum extent permitted by law, the authors are not liable for any loss or damage arising from its use.

This website

The website that lets you run the algorithm in your browser has no user accounts and sets no tracking cookies. The little it does process is described here.

• IP address. Temporarily processed to rate-limit requests and prevent abuse. It is not written to our database and is discarded shortly after.
• Analyzed positions. The positions you analyze, together with their computed verdicts, may be saved to the public gallery. They are never linked to you.
• Tutorial answers. Recorded anonymously to help us improve the lesson.
• We do not sell or share any data with third parties.