Presumably 5. Kd8 and 5. Kb8 also work?
Chess.com's Weekly Study: July 3rd 2016
Presumably 5. Kd8 and 5. Kb8 also work?
No! After the black knight promotion (Nc1) is caged. Tablebase says that only Kc7 brings the white king to the rescue - which is not so hard to verify.
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