I watched all of that and the guy didn't end up revealing which browser usually won. I'd really like to know! I'm assuming it's Chrome, seeing as it has the best Javascript performance (I think that's still true?).
2 javascripts running the same algorithm with slightly different performance might not actually make a large difference in who ends up winning, or you would see lots of draws just because in the alloted time examining a few but not a lot of extra moves and probably no more moves ahead might not help much.
Everyone ridicule's IE and yes, there are valid arguments against it, but one could also argue that it is because Microsoft shipped IE with Windows that the Internet was able to grow like it did.
Before IE, users of the internet had to use things like FTP or sneakernet or their geek friends to go find them a browser so they could get on the web.
But, then came IE standard in the OS and all the customer had to do is double click an icon. This was quite a bit easier as you may be able to imagine than the alternative methods to install netscape, ncsa mosiac, etc.
Before IE, the internet was largely the realm of technical literates. IE made it accessible to a much larger audience.