The people who think the chimp is a virtual lock are way off. Although the monkey would have a considerable strength advantage against a human, strength is not everything. Anyone who has trained in brazilian jiu jitsu knows that superior positioning and using mechanical advantages can overcome huge strength differentials. It would definitely be possible for a human to kill a chimp with a properly applied rear naked choke. Chimps are very strong, but the mechanical advantage that a fighter would have if he could secure the choke would be enough to prevent the monkey from prying itself loose.
Moreover, all the stregth in the world will not prevent the chimp from being knocked out. I don't care if the chimp can bench press 2000 pounds, a well placed kick to the side of its head will put it to sleep. And the human would have a very big advantage in landing the first knockout blow because humans are a lot taller and the chimp would have absolutely no knowledge of how to properly protect itself or really have any idea of what is at stake.
I think people are grossly underestimating how much of an advantage the human's intelligence would be in a situation like this. A well trained fighter has spent his entire life training in how to knock someone out or break their bones as quickly as possible, whereas a chimp has absolutely no awareness whatsoever of any kind of technique.
Finally I submit to you the following video of a trained fighter who is 6'5", 350 lb, ~ 8% body fat, (weighlifting stats: 585lb bench (close grip), 500lb incline bench, 800lb squat, 420lb power cleans) losing a fight to 230 lb man:
http://www.dailymotion.com/visited/s...ro-vs-bob-sapp
Now maybe the strength difference between those two fighters is less than the strength difference between a human and a chimp. But nevertheless, you still must take into account the HUGE difference of intelligence and skill between a chimp and a human.
In sum, anyone who thinks a chimp is the "dead nuts" against an elite MMA fighter is way way off. Substitue a gorilla for the chimp and I'll agree the gorilla is a lock.