[tonton]

In the original game against the comp, how do I beat the comp in the Protoss v. Protoss stage (when you get back to Aiur with the three heroes)?

While I'm busy upgrading and trying to build forces to attack, they send wave after wave to attack my defenses. With enough photon cannons it's easy to beat back the Dragoons and Zealots, but how the hell do I defend against the groups of five reavers accompanied by five scouts before they destroy either my photon cannons or half the forces I was trying to build? Building lots of scouts for air defense against the reavers is just too expensive because some will be killed by the scouts.

Also, when I'm attacking, what's the best way to avoid the enemy's "Stasis Field" and "Psionic Storm" attacks? And what's the best strategy for this map? Frontal assault? Kill the side bases first?

Funny after finishing the Terran and Zerg campaigns this is the first level I'm having trouble with. I guess I'm just not very good with the Protoss.

[SirCastor]

That's kind of a broad question. There isn't one way to do it, there are lots of ways you can approach attacking Protoss (with Protoss)
I'm not sure where you are in the game exactly, but I personally think the best defense against reavers is a couple of Psionic Storms, they just move too slow to get away.

Stasis Fields suck, but remember, you can't get hurt while you're in there. Some people build pylons (or supply depots for terrans) as a barracade while they attack. The Reavers will attack the first thing they run into.

I'll go play the campaigns again and see if I can figure it out..