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Mac Express Build 64...

I've been using the engine to analyse positions and the pull down to set position evaluation notation manually. I notice that notation also gets added to the places circled in red below:



However, it's not clear to me exactly when these evaluation symbols get added. Sometimes they got added, sometimes not. Is there some documentation explaining this?

Yes, this is a result of Backsolving. It's documented in this video: https://www.youtube.com/watch?v=XYt_YinfXpA

MikeAtBookup wrote:Yes, this is a result of Backsolving. It's documented in this video: https://www.youtube.com/watch?v=XYt_YinfXpA

Yes, but I have the express version so there is no back solving feature, yet the evaluation symbols are being set.

You are correct.

The program always displays the Informant rate symbol if the target position (reached after playing the move) is a leaf node (with no more candidate moves).

You could have assessed the position when it was still a leaf node and then later added more moves.

The Professional version calculates all the other Informant rates for the positions leading to the leaf nodes using Backsolving. The Express version does show the backsolved symbols that are calculated by Backsolving in the Professional version as well as any you set for leaf nodes in the Express version.

Okay I see now how it works after playing with it more. So "manually" setting the evaluation of leaf node propagates the evaluation up all the parent nodes as long as the child's evaluation is best among all its siblings for its respective color. Siblings that don't have an evaluation halt propagation. Very cool.