How to win in B2
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Stardock Forums
It seems pretty simple to win...if you don't have the Battle Axe ship files which are a separate install from the Library. Not sure why Battle Axe isn't included in the main download when the AI is clearly intent on using it. Unfortunately without the files, neither the AI or you can actually build a Battle Axe.
This prevents the AI from building any military vessels once the supply of colony ships is no longer required. No military vessels no opposition. You just walk in and take over the planets.
Cheers,
Dominic