There's rule in pdf file in that website, I poorly translated it by Google and all I get is that there'll be game 3 even if two previous games are won by one side.
You're not missing much. It's mostly about regulations to do with handling the computer side, e.g. the computer will use its own internal clock, the handler will have extra time to make the moves physically; the human will use a chess clock) and possible disputes. Games 1 and 3 will feature nigiri and the ruleset will be Japanese (can Zen really cope with that?).
The fact that they have set out such a protocol gives an impression that this is being taken very seriously. But I see that Magnus Carlsen has apparently called in Microsoft for help in preventing Russian hackers finding out what opening preparation he has on his computer, so this will presumably be the way of things for go in the future.
Cho has been in reasonable form lately, only just missing out on another title, and is not normally the blundering type, and I imagine he's also been able to study some Zen games. But my sense of what is going on here is that Japan may be hoping to recover a little bit of national pride by having the first oriental program to do well against pros, so maybe a lot of people will be rooting for Zen in Japan.
