Contact

We're setting up a contact address and form, and they'll appear on this page soon.

When you get in touch, these details help:

• Calculation errors: the page, the inputs you used, the result you expected, and where your expected figure comes from, ideally a rule book or official example.
• Rule changes: a link to the updated regulation. FIDE and US Chess both publish theirs online.
• Feature requests for the league tool: what you're ranking and how many players.

Until then, the FAQ and guides answer the most common questions.