Contact e4

How to reach the people who make e4, report a bug, or ask about your account or a payment.

Report a bug or ask a question

Open an issue at https://github.com/angelwingscomms/chess/issues. Say what you did, what you expected, and what happened instead. A screenshot and the browser you use help a lot. Every issue is read, and you will get an answer there.

Account and payments

If a payment went through but your balance did not change, open an issue with the date, the amount and the last four digits of the payment reference. Never post your card number, password or full email address in a public issue; we will ask for anything private through a safe channel.

Agents and developers

The public API, its rules and examples are on the developers page at /developers. The machine-readable summary for AI agents is at /llms.txt and the OpenAPI description is at /openapi.json.

Corrections

If the coach explained a move wrong, tell us the position (the FEN shown in the game menu) and what it said. Wrong explanations are the most useful reports we get, because they make the coach better for everyone.