The Myth of 100% Accuracy — What It Really Means to Play Perfect Chess

Have you ever finished a game, opened the analysis board, and seen that glowing blue number that decides your fate — your accuracy?

So close… but never quite 100.

On Chess.com, accuracy isn’t about whether you won or lost — it’s about how closely your moves matched what the engine would play.

Every move you make gets compared to Stockfishh. The engine evaluates whether your choice was:

• The best move,

• A questionable move or

• Or a move that is severely concering.

Then, your game’s accuracy becomes a number between 0 and 100.

So when you see 100%, it means that you literally played exactly how the engine would play

That’s insane.

Steps:

1. The engine checks your move versus their move.

2. Each move gets a score for closeness.

3. Finally, it averages those scores and scales them to 100.

Any move that slightly destroys your position can lower your accuracy slightly.

That’s why you might play the most best game of your entire life, but still land a 99.9

typical accuracy:

A few grandmasters have got 100% before... only when tthe game was short