Hindsight

Free chess game review

Every game has a turning point. Find yours.

Bring a game from chess.com, lichess or anywhere else. Hindsight grades every move, explains the moments that decided it, and lets you try the better move yourself.

Have a PGN or a position instead? Open the analysis board. Stockfish 18 runs on your device: no account needed, no upload, no daily limit.

Works with chess.comlichessPGN from any siteFEN positions

01 · The story

Read the game, not just the numbers.

Each review opens with a short summary of who played well and which move decided the game. Below it, the key moments are listed in order, each with a plain note on what happened and what was better.

  • Ten move grades, from brilliant to blunder
  • Accuracy, average centipawn loss and a rating-aware verdict
  • Separate scores for opening, middlegame and endgame

Legal played a clean game; Saint Brie made 1 serious error. The turning point: 5... Bxd1, blunder.

02 · Second chances

Find the move you missed.

Stop at any inaccuracy, mistake or blunder and play your answer on the board. Hindsight checks it with the engine, tells you if it holds up, and only shows the solution when you ask.

  • Works on every mistake in every game
  • Near-best answers count, not only the top engine move
  • Jump between key moments with one click
?Find a better move for Black
In the game, Black played Bxd1, which was a blunder. Can you find something stronger?
Show answer

03 · The timeline

See where the game turned, and where the clock went.

The whole game sits on one line you can drag through. Key moments are marked on the curve, and the bars beneath show how long each move took, so time trouble is easy to spot.

  • Drag to scrub, click to jump
  • Clock usage for every move of live games
  • Shareable links to any move

Illustration of a blitz game: the evaluation (top) and seconds spent per move (bottom).

04 · Explore

Test your own ideas against the engine.

Move any piece to start a side line. A live engine follows along with its three best continuations, and the analysis board takes any PGN or FEN you paste in.

  • Live top-three engine lines
  • Endgame tablebase for positions with seven pieces or fewer
  • Annotated PGN download
Stockfish 18depth 22
+0.381. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5
+0.321. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3
+0.321. Nf3 d5 2. d4 e6 3. c4 Nf6 4. g3

05 · Improve

Training built from your own games.

Hindsight finds the patterns behind your mistakes, like missed forks, loose pieces or endgames that slip away, and builds a daily session around them: your own positions coming back on a schedule, plus fresh puzzles of exactly the kinds you get wrong, from the openings you actually play.

  • Your weak patterns, ranked by what they cost you
  • Spaced repetition for your own mistakes
  • An opening leak finder for any chess.com or lichess player
  • Play the computer from any position

Open training

Opening leaks · example

Caro-Kann Defense (Black)scores 41% over 12 games, against 58% overall
Italian Game (White)scores 44% over 9 games, against 58% overall

Illustration. Your own leaks appear on your stats page.

Yours to control.

Runs on your device

The engine is Stockfish 18, compiled to run inside your browser. Your games are fetched straight from chess.com or lichess and never pass through a server of ours.

No account needed

There is nothing to sign up for. Analyses are cached in your browser so returning to a game is instant. Connecting a lichess account is optional and only adds lichess’s masters and online-games explorers.

No limits

Review as many games as you like, at any depth your device can handle.

Questions

Is it really free?
Yes. The analysis runs on your own device, so it costs us nothing per review and there is no reason to limit you.
Why is my accuracy a little different from chess.com's?
Their formula is private. Ours is calibrated against their published numbers on hundreds of real games and lands within about three points on average, but it will rarely match exactly.
Which games can I review?
Any standard chess game: search a chess.com or lichess username, paste a game link from lichess, or paste a PGN from any other site.
Does it work on a phone?
Yes. Analysis takes longer on slower devices; the Quick depth setting helps.
Do you track me?
Hindsight itself has no analytics and no accounts of its own (connecting lichess is optional, for two of its explorers). There are no ads yet, so no ad cookies either. If ads are added later, they will come from Google, which uses cookies for them, and this answer will say so. The privacy page lists everything that leaves your device.

Review your last game.

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Keyboard shortcuts

← →
Previous / next move
↑ ↓
First / last move
F
Flip the board
X
Show the opponent’s threat (analysis board)
Esc
Leave a side line or a retry
Right-drag
Draw an arrow (right-click a square for a circle)
?
Show this list

How to read a review

Move grades

The numbers

Accuracy
How close a player's moves were to the engine's, from 0 to 100. Above 90 is excellent at any level. Calibrated to land close to chess.com's figure.
ACPL
Average centipawn loss: how much evaluation a player gave away per move, in hundredths of a pawn. Lower is better; strong players are often under 25.
Usual level
Compares the accuracy with what is typical for the player's rating: above usual, usual, or below usual.
Opening, middlegame, endgame
Accuracy within each phase of the game, to show where points were lost.
+1.20, −0.50, M3
The evaluation. Positive favours White, negative favours Black, roughly in pawns. M3 means a forced mate in three.

Getting around

Step through
Use the arrow keys, the buttons under the timeline, or click any move.
Timeline
The line is the evaluation over the game; dots mark key moments; bars underneath show time spent per move. Drag on it to scrub.
Try again
On a weak move, play your own answer on the board; Hindsight tells you if it holds up.
Retry them
Under the game summary: walk through every mistake you made in this game, one after another, and see how many you can fix.
Explore
Move any piece to try a different line. Press Esc to return to the game.

Settings

Board

Pieces

lichess account

Analysis engine

Game reviews always use the quick engine, because accuracy scores are calibrated against it.

Display