Privacy

Position generation and button interactions

When you generate a position, successfully copy its FEN or PGN, or click Analyze on Lichess or Lichess offer, ZeroChess logs the action, the request's IP address, approximate location, browser information, and an anonymous session ID. Copy and Lichess link events also include the displayed position's FEN, not other clipboard contents. This information is used for security, rate limiting, and usage analytics. Logs older than 30 days are removed when new events are recorded.

Contact messages

Information submitted through the contact form is stored and used only to respond to your message.

Lichess

Analysis and play links send the displayed position to Lichess. Lichess also receives your IP address and browser information. Its privacy policy applies when you visit.