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AlphaGo resigns

The result "W:Resign" was added to the game information.

Edit: Tinyyy is right.

I think it reads W:Resign

No, it's "The result “W+Resign” was added to the game information"

Usually the nomenclature is "W+Resign"

"White wins by resignation".

According to this picture[1], it is more likely "W+Resign". I'm curious why a plus sign is used instead of a colon!

In go results are Color+amount of points, when counted. So the plus is then left for uniformity in resigns/forfeits

Likely they're using SGF format to store game records:

Bad google+ joke withheld.