RookSac

Free chess game analysis for Chess.com & LichessThe private chess audit for players who feel stuck.

One game won't tell you much. Analyze dozens, hundreds, or all of your Chess.com or Lichess games at once with Stockfish, find the patterns behind your results, and turn them into a personal improvement plan — the exact openings, tactics and endgames to work on next.

Bulk analysisReview your whole game history in one click, not one game at a time.
Adapted planConcrete, prioritized study steps built from your recurring mistakes.
Free & privateRuns entirely in your browser. No account, no upload, no cost.
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More game filters optional
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Everything runs locally in your browser, so more games & higher depth = longer waits.
Stockfish engine settings
Uses one principal line for the full-game pass, reuses the next position instead of searching played moves twice, and keeps the engine cache warm between games. Disable it to apply the selected MultiPV to every position; live puzzles still evaluate up to four branches.
Adds a short explanation of the line from Wikibooks' Chess Opening Theory to opening moves in the review screen, credited and linked as its CC BY-SA licence requires. Fetched only for the move you are looking at, then cached.
RookSac includes Stockfish 17.1 lite. Advanced users can point this to another compatible browser-worker build they host.
Fast bulk review starts with a quick pass. Keep this tab open while Stockfish works; a live remaining-time estimate appears during analysis.

100% free & private — analysis runs entirely in your browser. Games are read from the public Chess.com and Lichess APIs. No account or login required.

Fetching games…