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[laiocfar]

2 fusion ball defense + grav shield - destroys any alien battleship. 100%

Guys do not let aliens to found a base.
Intercept any BattleShips.
I am always shoot it. So during the game I have 1-2 alien bases founded by Sectoids in early game or midgame.

Do you know- large and medium scouts can be found undamaged on crash site. Just save before landing , if you see that UFO damaged then load and land again. Each time you land your UFO will have a different condition so wait for brand new condition. And theese UFOs become a good suppliers of elerium and money. [/b]

First, save/load/load/load is to cheat. You should dont care coz if you use Ctrl + C.
But outside these dreamland of no challenge where you always win, interceptors even 4 armed with plasma or avalanches cant defeat battleships. The damage of the UFO is also a tactic factor, a medium scout completely open to the sky is a crucial advantage agaisnt sectoids, a constant danger against floater and a sure defeat against ethereals.
Aliens are capable of found bases coz they are capable to do it when: you dont got armed air forces in range, their ships are too big or just they made the right move and you the wrong one.
Battleships only attack bases or search them for attack when the bases was already sppoted or attacked by another ufo.
grav shield + 2 FB defence isnt enough most of time, better to got 3 FB but the cost of these tecno + the cost of the building make them privative in early and half of mid game.