I am laying on large map, everything abondant, 9 races, NO TECH TRADE.
Winning on maso difficulty is pretty easy, but when it comes to Obsene, the AI just buy off tons of colony ships and basically grab all the few colonizable planets.
Even with Talans (Whose factories bonus , added to their already strong native bonuses) is pretty impossible. No only they grab planets but, they are also pretty smart by grabbing all the economic ressources pretty quickly

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If you have any tips plz help.