I played this map last night with a good friend of mine, and it sure was fun.
You start with a single-chokepoint fortress you share with your ally, and 10 AI opponents have bases around every edge of the map (except south, where you are). Every player (and AI) has several nodes of high yield minerals, with 100000 minerals in each. Vespene Geysers are also plentiful in the same way.
We were both Terran, and we focused on getting tanks first on our high ground, followed by turrets to protect them from air units spotting them. Then we set up a line of turrets around each wall of our base. A lot of turrets, trust me. Though it's not like we were low on resources ;). The enemies were set to Easy difficulty, for obvious reasons. But you can change the difficulty, of course.
The first enemy attack was nearly all at once. Our siege tanks decimated them all, in a quite satisfactory display of siege mode. Once we had tanks, turrets, and SCVs on auto repair at the choke point, we were near invincible, and set out mass-producing nukes and ghosts to finish off the enemy. Slowly but surely, we nuked (and sometimes Yamato'd) every enemy to death. Victory was gained when every enemy had no more units of any type.
Problems with the map:
It was quite obviously one of the first maps made by the author, which was shown by sloppy terrain work surrounding the enemy bases. Mountains intersected the bases as natural barriers, but the author forgot to remove ground pathing on the mountains, or even smooth them a little. The result was your units being able to mountain-climb like champs up strange mountains with jagged spikes in some places, and huge pitfalls in others.
Enemies never expanded past their original base, despite several natural expansions being available for them.
Early defense against the 10 AIs is (in my opinion) impossible if you are playing Zerg, and damn hard if you are Protoss.