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[another_guest]

I definitely agree on the point that 2 fusion defenses + a grav shield aren't always enough. I once ran the test of cycling through several months (more than 100 base attacks) and checking whether my base defenses held. 3 fusion defenses + grav shield seemed to be enough.

Never tried this, but how about equipping your soldiers with decent armour, then first flushing most of the alien base with smoke grenades, add a few stun bombs? Might work well for some races, if you ask me. Of course visibility would be terrible... So maybe blaster bomb your way to the control center :P