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George Duke writes:

The error in 'Guardian' article is that OrthoChess has 20 possible first moves not 28.

First, here is what the article actually says:

Hassabis notes that while chess has an average of around 20 possible moves for a given position, Go gives the player about ten times as many options, resulting in a massively higher branching factor that is far harder for any AI to deal with.

This is not about the number of possible first moves but about the average number of moves for a given position. This seems incorrect, because as pieces are developed in Chess, the number of possible moves rapidly increases from 20.

Second, OrthoChess does have 20 possible first moves. These are 8 one-space Pawn moves, 8 double Pawn moves, and 4 Knight moves.

Okay, the article you linked to this time does have that error. It says,

The first move of a game of chess offers 28 possibilities;

You linked to a different article in your previous comment.

Thanks Fergus.  It's pretty interesting for us and different that they call
a "game" a match.  So there are five matches in the next week, as one
contest, and will put about one different news source to
announce each result. Kasparov played Shogi and Makruk, and Shogi masters
transfer well to OrthoChess, but have not heard that Go skill helps Chess
or CVs particularly but it seems reasonable.  Let's say I would not want to
play Lee at Chess either. Then too AlphaGo is the program or British "programme" so it's Lee Se-dol versus AlphaGo, like it was Kasparov versus Deep Blue. And articles say that the added feature of policy network (and all that programming) to value network may make AlphaGo stronger than Lee realizes.

I have been looking for a word besides game that would mean game in the
sense of a specific game played between two people. Currently, the word
game does double-duty, referring to a particular set of rules, as in the
game of Chess, or to individual games played between people, as in Bobby
Fischer's "60 Memorable Games", which are all Chess. I don't think match
quite does it, because a match can include a plural number of games played
between two people.

I would think "duel"

Loss

Lee Se-dol said beforehand he was out to save humanity. It was the same expression Kasparov used in 1997. Apparently it was just so much posturing or advertising or propaganda, because they don't say after each of these fiascos that humanity lost, just that Computer won.