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?

King in Chess: Movement, Value and Rules (Explained!) (+ 3 Tips)

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Bruce King's Rule of The Bones – PhysicalMind Institute

A Peculiar Property of Definite Integrals // The King Rule (The Art of Integration)

PPT - Monarchs following the rules? PowerPoint Presentation, free download - ID:2061223

Four important rules of Castling: 1) The King and Rook may not have moved from their starting squares 2) All spaces between the King and Rook must be empty. - ppt download

The King: His strengths and weaknesses –

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Kings Cup Game Rules, PDF, Leisure Activities

The king rules

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Rules of Kubb — Kubb United