What if there's one warp point on one side of the system and one directly across from it? AFAIK, the AI isn't smart enough to avoid obstacles more than 3 sectors in width...
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The Ed draws near! What dost thou deaux?
I think the blackhole is 6x6 sectors wide so it they might be able to navigate around it (note that it is smaller than in normal SE:IV) but I'll give it a test.