FAQ
Answers to common questions about play, analysis, accounts, and tactical puzzles.
Can I play without an account?
Yes. Basic play and part of the guide content are available without logging in. An account is useful for saved history, online features, and easier work with analysis.
Why can analysis be Premium?
Engine analysis uses server resources, especially when many users run it at once. Premium helps keep the service stable and fund further development.
Does Stockfish use an opening book?
The first moves can use prepared opening positions so games do not always start identically. After leaving known positions, Stockfish takes over.
What does the puzzle ranking mean?
The puzzle ranking shows the best correct puzzle solutions. The score depends on puzzle difficulty and solving time, so fast and correct answers rank higher.