Requirements

Common Errors and Fixes

Error 1 - Chrome failed to start

Klar's managed Chrome didn't launch correctly.

1. Make sure Google Chrome is installed and updated.
2. Fully close all Chrome windows, then relaunch through the Loader.
3. If it still fails, upload your log file to your ticket
    

%localappdata%\klarchess\latest.log

Error 4 - Board can't be read

The klar.gg chess engine can't read the board properly.

1. Open the Chess.com page in the Klar Chrome window.
2. Start a game against bots
3. Click the settings button at the top-right of the board
   • Set the "Piece Notation" setting to "Text".
   1. Set the "Show Board Coordinates" to None
4. Go to your Board Settings and disable "Show Board Coordinates
5. Go to your Profile Settings and set "Language" to "English"

Still failing? Reset your desktop colors to default and disable any Nvidia/GPU color adjustments; custom color profiles can interfere with board reading.

Error 5 - Engine failed / move not played

The engine crashed or couldn't complete a move. The most common causes are Max Elo / Depth set too high, or Chrome blocking the bot.

1. Restart the product and lower your Max Elo and Depth.
2. Update Chrome and reset it to default; disable extensions, ad blockers, and pop-up blockers.
3. If it continues, try an older version of Chrome.