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  3. Draws for insufficent material

Has there been examples of people losing endgames like this, like being mated in the corner by promoting to a knight.

#11, that’s not the question, never.

My answer nevertheless: the same amount of people who won this position:

lichess.org/2efRH982opo7

Moreover, there are pawnless single minor piece mates in the ChessBase database.