When I was new to map making, I made a map where you couldn't get out fo your base because of minerals, you had to mine your way out. (I was always Terran and flew to the middle base and mined the minerals there, it was very safe,
) Anyawys, the computer would always do the same thing. It built 3 spore colonies in the back of the base, a queen's nest in the left, with a Spire and hydralisk den, an extra hatchery and a spawning pool on the right, and a sunken sort of on the left. Every time I played, the Zerg would play them same (if it had the bottom base). Protoss would build pylons everywhere, and make just zealots, no dragoons, so it was easy to pick off with air, this happened when Protoss was in the top base. Terran actually kept it's brain atleast a bit, it would go all the way through the tech tree, but on this map is was so easy to rape the computer it wasn't even funny. I wonder if I still have it, lol.
I once made a quick RPG where the middle area where you healed would kill all the enemy units. I played around with scripts, and on Insane, it would rush my guy in the middle, my guy just sat on the heal beacon as tons of zerg units died around it.