[Danny]

What I'd do is add up total damage a fleet can take including armor and shields, then add total damage all weapons can do in 30 turns, do the same for it's own fleet, then have it attack only with a certain ratio of strenght.

For defenses I'd add a condition that if a planet is blocked it most build weapons platforms, troops, fighters, and shields until no longer blocked, or 'till all cargo space is full.

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I AM Canadian.