Tried out the solo rules included in the invasion rulebook and found them to be more than a little confusing at first read. However after drawing them out as a decision tree/flow chart on the back of an envelope I found them to be quite effective; initially I forgot about needing to cool the heat ray and my attacking planes very quickly bit the dust.
The flowchart is still quite intimidating but does help avoid constantly flipping through the rule book.
Google Drive pdf of the flow chart.
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