What's the fastest way to checkmate with the king?

Since the king cannot produce a mate on its own, the quickest way to checkmate with your king is with assistance from other pieces. The "smothered mate" or back-rank checkmate with rooks or queens is a popular strategy. The king aids in cornering the opposing king, particularly in simple endgames such as rook vs. king and king.

Since the king cannot produce a mate on its own, the quickest way to checkmate with your king is with assistance from other pieces. The "smothered mate" or back-rank checkmate with rooks or queens is a popular strategy. The king aids in cornering the opposing king, particularly in simple endgames such as rook vs. king and king.
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What's the fastest way to deliver checkmate with the king?