surely this has more to do with fitness more than anything?
i'd say only around 10 or so 5 year olds can really surround you in a fighting circle, everyone else behind is just making up the numbers or making it harder for the 5 year olds to strike. They are probably too small for big shots so you are protecting against shots to the nuts and to gut from the front, and kidney punches from behind.
with arms tucked in and a fairly hefty pair of boots you could probably , in a worst case "completely surrounded" scenario, boot your way through what ever is in front of you and trample over those that fall down without taking any real damage at all.
Get your back against a wall and you don't even have to watch the kidneys and it decreases the number of potential attackers.
I suggest backing off against one wall at the start, take out a few , then clear what is infront of you and run to the other wall. After that it's just simple crowd control - 5 year olds aren't good on mobility and striking at the same time.
Rinse and repeat. simple.
i don't know what the basis is, but if you look at this with any sense of realism, once the first dozen of those little shits goes down, the others are gonna back off. If they have a bladed or some other weapon which can easily inflict damage without blunt force, they have a chance. Otherwise, the average adult can punt quite a few of them which will slow them down enough to kill them. If there's an endless wave of them, you'll obviously succumb at some point. i'd probably punt most of them because they're too short to punch, kill a couple of them in a graphic way to send a message and use them to swat others, use their sweet blood to refill my health, then repeat.
My score was 23, and disturbingly enough, i'm wondering how i can i arrange such a test. Probably in Thailand.