Terms

Terms of use

Last updated: 29 September 2026

By using PolyMind Chess, published by Cyril Dieumegard, you agree to the following terms.

The service

PolyMind Chess is a chess coach that runs in your browser. It combines Stockfish, decision engines such as JEV and coach Léon. Analysis and advice are educational and may contain errors.

Account

A Google account is required to play. You are responsible for the use of your account. One account per person.

Free plan and subscription

The free plan includes a limited number of games. The USD 4.99 monthly subscription includes unlimited games. It is billed by Stripe, renews monthly and can be cancelled anytime from your account; access remains active until the end of the paid period.

Acceptable use

You may not bypass plan limits, automate large volumes of requests to decision engines or disrupt the service.

Availability and liability

The service is provided as is. We do our best to keep it available but cannot guarantee uninterrupted access. Data stored in your browser remains under your control; export any games you want to keep.

Changes

These terms may change. The last update date appears at the top of this page.

Contact

[email protected] · See also the privacy policy.