[LintMan]

Yeah, counter-intelligence is an ongoing project, so every turn it is active, it has a chance to block intelligence operations against you. I would imaging that more intelligence points spent would give a higher chance.

I'd love to know what the percentages are, but it isn't detailed in the manual.

If you have the "view all players scores" option on in the game, you can see what everyone is generating in the way of intelligence points, so you'd have an idea if you're being massively outspent.

My advice is either pump up the amount of point you're putting into counter-intel, or send a fleet and punish the computer player by destroying some of his planets. (Esp useful if you can find where his intelligence bases are and take them out.) Get nasty of you have to... research plague bombs and kamikaze some of his planets with those...he's probably unlikely to have med tech since he'll have put all his RP's into intel.