I am enjoying learning this game by playing it, but after two weeks of careful study and reading the manual through about four times, I still find the actual system used to calculate combat results opaque. Especially frustrating are the cryptic calculations that appear under the estimated losses in the preview pane - nowhere in the manual do you give a good explanation of how to read these legends.
Would it be possible to write out some actual examples of combat between various units (especially on land where there are the most modifiers) and explain how the likely casualties are derived? It would be great if this could be accompanied by some screen shots. This would help beginners like myself go beyond relying on the combat previews to understand the consequences of placing our units in different situations relative to supply, HQ and terrain, plus the cumulative consequencies of morale and readiness.
Been playing SC2 for a while and still don't get the system. In general, unit morale, supply, strength, tech level, and HQ leader all come into play. Also defensive bonus or offensive penalties for weather and fortifications. Would like to see something like you're describing as well.