i agree that it is an interesting result, however having access to everything is weird from an AI point of view and really muddies any conclusions to be drawn; the headline seems to make it sound like this is a breakthrough in AI, when it is using a cheat that won't apply to any sort of real situation.
notice that in your example of solitaire, knowing the values of hidden cards really changes the nature of the game and makes playing the game much less strategic
notice that in your example of solitaire, knowing the values of hidden cards really changes the nature of the game and makes playing the game much less strategic