Alternate Line
As computer-generated endgame tablebases confirm, Black can offer longer resistance by 3 ... Kb2, for which White has only one winning reply, 4. c8Q, promoting to a queen instead of the underpromotion to a rook. Then White can force checkmate on the twenty-sixth move. However, per the anthropocentric conventions of endgame studies, moves that result in positions known to human masters to be theoretically lost are considered sidelines.
Read more about this topic: Saavedra Position
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