How does chess engine works on chess.com?

Hi all,

I am curious to know where the processing power for analysis come from. Is it locally from the user's computer/tablet/smartphone or is the engine and calculation made online on chess.com servers ?

Thanks for your feedback!

Hi plem,

It seems that they have recently made it clear.

As you can see, move by move analysis runs on the local computer, but full short analysis of the game runs on the cloud. This is for after-game analysis. While viewing other people's games on live chess, you can also run a chess engine which also runs locally.

I have turned the engine off because I don't like the unnecessary high CPU usage. If I have to analyze locally, I download the game and use my local installation of Stockfish which is far more efficient than the javascript version running on the browser.

interesting thanks!

it's analysing my game very weird. seems to think a draw in unavoidable in the Italian game with Knight to f6, which i thought was actually a blunder to be honest

@RasputinHoney With Stockfish 15 vs Stockfish 15 a draw in that position might be unavoidable. You have to remember the evaluation is calculating both players always making the best possible moves. You can use an archive search for the position in real games played to see what is more likely to happen.

Shouldn't really be necessary to even bother with chess engines. 

You can see when a move is a blunder or not..