Let’s Check recognises three levels of evaluation depth. The “green level” is the lowest and needs about a minute of calculation on a modern computer with a deep engine. Evaluations below this level are ignored when choosing a main line.

 

 

The “blue level” is the depth that is needed to discover a position. The “red level” leads to the message “Deep Analysis” in the Chat window. On a modern computer with four processors this can last up to an hour.