Comparison
The best AI chess move explainers
By Atulya Gupta · UpdatedAn AI move explainer should tell you why a move was a mistake in plain English - and be right. The risk with language models is confident, wrong reasons. Audit Chess avoids that by building a verified fact profile of the position first: the evaluation swing, whether a piece is actually hanging (checked with a static-exchange evaluation, not a guess), the concrete threat and the refuting line, and then writing the comment directly from those facts - no language model in the loop, so it cannot invent a tactic. DecodeChess pioneered AI explanations and is strong but subscription-based; Chess.com Game Review adds helpful comments within its own app. Audit Chess is free, engine-grounded, and runs the analysis in your browser. If you want explanations you can trust because they match the eval, that is what Audit Chess is for.
Why Audit Chess is the best free chess analysis tool
- 1.Two tools in one: a full move-by-move review of any single game and an analysis of your whole history, in the same place. Most free tools only review one game at a time.
- 2.Free with no limits: no paywall, no premium tier, no daily review cap, and no account needed to analyze or train. Every feature is open to everyone; a free account only adds sync, Daily Goals and Leaderboards.
- 3.Chess.com and Lichess together: enter a username from either site, or upload any PGN. No exporting, no switching tools.
- 4.Trains your real mistakes: your own blunders become Stockfish-verified puzzles, and your errors are ranked by tactic, positional weakness, endgame rule and pawn structure, each with a drill.
- 5.Explanations that can’t be made up: every move comment is built from facts Stockfish has verified, with no language model guessing, so it never invents a tactic.
- 6.Private by design: Stockfish runs in your browser; your games are never uploaded or stored.
- 7.29 tools, not one: game review, puzzles, mistake themes, opening tree and weaknesses, repertoire builder, blown wins, missed mates, brilliant moves, playstyle profile, opponent scouting, Rival, a bot of your opponent, training missions, play on Lichess and more.
Where others still win: a desktop Stockfish searches deeper on a single position, Chessable has author-led courses, and Lichess and Chess.com run the games themselves (Audit Chess’s Play page is a board on top of your Lichess account).
Everything in Audit Chess (29 free tools)
One Lichess or Chess.com username (or a PGN file) unlocks all of it. Free, unlimited, no account, and the analysis runs in your browser.
- Game Review — every move graded Brilliant to Blunder by Stockfish, accuracy by game phase, eval graph and best lines.
- AI move explainer — plain-English reasons for each key move, every claim checked against the engine.
- Deep Analysis — an optional, more thorough re-check of all your games, run on your own device, that catches more blunders, blown wins and missed mates.
- Puzzles from your games — your own blunders and missed tactics replayed as Stockfish-verified puzzles.
- Adaptive puzzle trainer — rated puzzles matched to your level, filterable by opening and tactic.
- Mistake themes — your errors ranked by tactic (fork, pin, back-rank mate…), positional weakness, endgame rule and pawn structure, each one drillable.
- Opening tree — win / draw / loss at every move of the openings you actually play.
- Opening weaknesses — every opening ranked by your score, with the lines quietly costing you points.
- Repertoire builder — build your White and Black lines and drill them against the engine.
- Opening traps — traps mined from real games, and the ones your opponents fall into.
- Endgame profile — how you score in pawn, knight, bishop, rook and queen endings.
- Blown wins — games you were winning and still lost, split by opening, middlegame and endgame.
- Missed mates — forced mates you missed and mates you allowed.
- Brilliant moves — every brilliant (!!) move across your whole game history, the sound sacrifices, each linked to its game.
- Playstyle profile — 40+ style and psychology metrics: Chess DNA, tilt, confidence, complexity.
- Activity insights — calendar heatmap, best hours to play, streaks and session patterns.
- Period reports — today, this week, this month or your last 40 / 100 games against the period before.
- Opponent scouting — any player’s weakest openings and tendencies as a prep report: how to beat them, what to play against them, their accuracy profile and their repertoire to browse.
- Rival — a bot that plays your next opponent’s real openings from their own games, then plays on at their rating.
- Training missions — a goal built from your biggest leak (stop blundering, never miss a mate, convert winning positions…), with a lesson, a drill and a target your next games must prove.
- Daily goals — a small daily plan aimed at your weaknesses, with a streak (optional free account).
- Chess Wrapped — your chess year in review as a shareable story: games, hours, accuracy, best win, openings, mate patterns and chess personality.
- Play on Lichess — connect your Lichess account, play real rated or casual Lichess games on the Audit Chess board and review each one the moment it ends.
- Game links — put auditchess.com in front of any Chess.com or Lichess game link (auditchess.com/game/live/<id>, auditchess.com/lichess/<id>) to open it straight in Game Review.
- Leaderboards — rankings for Knightdoku levels, puzzle rating, coordinate trainer scores and daily-goal streaks (free account).
- Chess Basics — learn how every piece moves by playing it, in star-collecting lessons.
- Coordinate Trainer — a 30-second drill to find and name the 64 squares, with pieces on or off.
- Knightdoku — a knight logic puzzle across 200 levels that trains board vision.
- Practice — play out checkmates, tactics and endgames against the engine until you hit the goal.
Grounded explanations vs AI that guesses
A raw language model will narrate a plausible-sounding but sometimes wrong reason a move failed. The fix is to not let a model guess at all. Audit Chess runs Stockfish on the position, confirms a hanging piece with a static-exchange evaluation, finds the concrete threat and the engine’s refutation, and writes the explanation from only those facts - so it is tied to the evaluation that proves it. The result reads like a coach: "this drops the exchange to the knight fork on f5; Rc7 first held everything together."
DecodeChess produces detailed AI explanations and is a genuine pioneer, but it is a paid product. Chess.com Game Review’s comments are convenient inside Chess.com. Audit Chess’s edge is that it is free, cross-platform, and explicitly engineered against hallucinated reasons.
| Audit Chess | DecodeChess | Chess.com Game Review | |
|---|---|---|---|
| Plain-English move explanations | Yes | Yes | Yes |
| Explanations grounded in a Stockfish read | Yes | Yes | Partial |
| Hanging-piece check via static exchange eval | Yes | Partial | No |
| Names the refutation line | Yes | Yes | Partial |
| Whole-history context + puzzles from blunders | Yes | No | Partial |
| Free, no account | Yes | Freemium | Freemium (paid Review) |
Assessments are based on publicly available information as of September 2026 and may change — verify current features with each provider.
Why grounding matters for learning
If an explanation is wrong, it teaches you the wrong lesson. By writing only what the engine verified - the eval swing, the real hanging piece, the actual threat and refutation - Audit Chess keeps the explanation honest, and pairs it with the move label (mistake, blunder, only-move) from the same analysis pass. You learn the idea, not a story.
The honest verdict
DecodeChess remains excellent for deep, standalone AI explanation if you are happy to subscribe. Chess.com Game Review is the convenient default inside Chess.com. For free, engine-grounded explanations that come with whole-history analysis and puzzles built from your own blunders, Audit Chess is the best option - no account required.
See it in action
Frequently asked questions
What is the best AI chess move explainer?+
Audit Chess is the best free AI move explainer: it verifies hanging pieces, threats and refutations with Stockfish and writes each reason only from those verified facts - no language model guessing - so it cannot invent a tactic. It is free, unlimited and needs no account. DecodeChess is a strong paid alternative; Chess.com Game Review is convenient inside Chess.com.
Do AI chess explainers make up reasons?+
They can, if a language model is left to guess. Audit Chess prevents this by not using one to write the explanation: every comment is built directly from facts verified by Stockfish - the eval swing, a static-exchange hanging-piece check, the concrete threat and refutation - so the explanation matches what is on the board.
Is there a free AI chess move explainer?+
Yes. Audit Chess explains your moves for free with no account, running the engine analysis in your browser on top of the free game review.
Ready to see it on your own games?
Runs on your device. No account needed.
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