MicroPlanet Gravity - Scoring Overview

MicroPlanet Gravity > Help [F1] > Index > Scoring > About Scoring (Overview):

Scoring Overview
Tools - Scoring
Gravity's scoring prioritize (and optionally colors) threads based the score
of the highest scored article within the containing thread. The values are
based on the articles visible in the thread list, according to the display
filter. As articles status changes, the view and thread sort may change as
articles drop out of the filter.
You may see negative scored articles in high scored threads. Scoring by
itself does not perform actions on articles. However, you can use a score as
a condition in rules to mark articles as read and more. In Rule examples, we
show how to do that. You can also use score values in filters. As an example,
you could modify the default "Unread Articles" filter to include articles
with a positive score and not show low-scored articles. 
There are two ways to add score entries; the "Add Score Entry" (Quick Score)
and the Main Scoring Dialog.
* Add words using the "Add Score Entry", or "Quick Score" (keyboard shortcut:
 "S"), which adds a score entry that applies to the current newsgroup.
* The Main Scoring Dialog is like a control panel for all score phrases. Use
 this to create score "groups" with wild cards, so that certain score
 entries apply to more than one, or all newsgroups.
* Score phrases can be wildcard, regular expression, or plain text. Whole
 words can be specified for any input.
* Scores are added to individual articles, but score sorting is based on
 thread value, which is based on the highest scored articles within a thread.
* To update scores after you have added score phrases, use the "Re-score
 current group" command (or do it automatically using the option in the
 "Add Score Entry" dialog).
What You Can Do With Scoring
Rules - You can use score values in rules to trigger certain rule actions,
such as mark articles read. You can also create rule actions to add score
values (positive or negative). See How-to use scores in rules for details.
Sort Threads - You can  configure Gravity to sort threads in the thread pane
by the maximum article score within each thread. Threads with high scored
articles are moved to the top of the thread list.
Color Threads - You can color code score ranges.
Filters - You can use scores in advanced display filters. For example, you
can create a filter that only shows articles scored greater than zero.
Create another filter that displays articles scored above 500, etc. You can
quickly reduce clutter and scan a group for the most important articles
this way.

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MicroPlanet Gravity v3.0.11 (2021):
https://www.grc.com/discussions.htm