Computer analysis isn't that strong, sometimes it just doesn't see far enough. But since it did see it, and then also saw that Kb3? is draw -- it should have called it a blunder. Weird.
As far as I can tell, white wins by immediate breakthrough:
From Mate in 18 to draw with no error?
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I saw h5 too late and blew the win. I think Kb3 deserves ??.
Jul 7, 2009
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#4
h5 is mate in 18 (check t-bases). It's possible that the computer analysis is using a mix of t-base results and its own results and the integration of the t-base results isn't so smooth.
White to move. Computer Analysis says that White has Mate in 18. White's next move was 49. Kb3. The computer does not give the move a ? or ?! but lists the game as almost dead even (+0.01). How can White go from a forced mate to a draw without making a questionnable move? Was there really no forced mate?