Unsufficient Material Rule
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Why king+knight vs king+bishop is a draw by insufficient material? (As in my last game)
Because both a king and knight duo and a king and bishop duo are incapable of checkmating a lone king.
Because there is no forced checkmate using king+knight or king+bishop, i.e. you and your opponent would be moving pieces forever (or until any of you uses 50 moves rule etc)
https://support.chess.com/en/articles/8705277-what-does-insufficient-mating-material-mean
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