The king rules

In endgames, the king is indeed a powerful piece. In the diagram position it is Black to move and he found a way to show the strength of his king and to win the game. What did Black do to let his king rule?

Rules - Skull King, Family Games, Grandpa Beck's Games

Rule of Wolves

The king rules

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READING FOR SANITY BOOK REVIEWS: The King of Scars Duology (including King of Scars #1 and Rule of Wolves, #2)