Question 1

What is ChessIQ for?

Accepted Answer

ChessIQ helps you review games you played, understand the moments that changed them, keep useful Saved Positions, and notice recurring patterns across your local review history.

Question 2

Is ChessIQ free?

Accepted Answer

Yes. ChessIQ is permanently free to use. It does not require a ChessIQ account or payment.

Question 3

How do I start a game review?

Accepted Answer

Open Review, then paste a PGN, upload a PGN file, import a supported Chess.com or Lichess game link, or look up recent public games by username.

Question 4

Do I need an account or a connected chess-platform login?

Accepted Answer

No. ChessIQ does not require an account and never asks for your Chess.com or Lichess password. Username lookups use public game data from those services.

Question 5

Where does analysis run, and which engine does ChessIQ use?

Accepted Answer

Core analysis runs on your device in the browser using Stockfish 18. Device speed affects how quickly deeper analysis settles, so the same review can take longer on a phone than on a faster computer.

Question 6

Why can evaluations or move labels change during analysis?

Accepted Answer

Deeper search can reveal tactics, defenses, or stronger continuations that were not visible earlier. ChessIQ also uses position context when presenting labels, so a label is not simply a fixed name for one centipawn-loss threshold.

Question 7

Where do Saved Positions come from, and can I revisit positions I’ve already reviewed?

Accepted Answer

Saved Positions come from suitable missed chances, conversion chances, and major mistakes in your completed reviews. Not every game produces one, and reviewed positions can return later as follow-up.

Question 8

Where are my reviewed games and saved-position state stored?

Accepted Answer

Core analysis runs in your browser, while review history, Saved Positions, and many preferences are browser-local by default. Public imports and analytics are narrower network boundaries: username and game-link imports pass through ChessIQ server routes before ChessIQ requests public game data from Chess.com or Lichess; analytics is designed to exclude usernames, PGNs, FENs, URLs, and move text.

Question 9

How do I move, back up, or delete my ChessIQ data?

Accepted Answer

Use Your Data to export a backup, import one into another supported browser, or clear ChessIQ data. Browser data does not sync automatically between devices, and clearing browser storage can remove it.

Question 10

What works without an internet connection?

Accepted Answer

Previously cached pages and local review data may remain available, including cached app and engine assets when available. Public-game imports, uncached pages, and anything else that needs the network will not work until you reconnect.

Question 11

What should I try if analysis does not start or seems stuck?

Accepted Answer

Wait briefly for Stockfish to initialize, then reload the page and try again. Confirm that your browser supports WebAssembly and Web Workers, close memory-heavy tabs, and reconnect if the engine was not previously cached.

Question 12

Why is my Archive or Saved list empty on this browser?

Accepted Answer

ChessIQ data is local to the browser profile where it was created. If you changed browsers, devices, private-browsing sessions, or cleared site data, import a backup if you have one; otherwise start a new review here.

Help with ChessIQ

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