Draw no?

Perhaps i am unfamiliar with the rules, but why is this now a draw? How is mate possible for him? An explanation would be helpful, thank you

@fasterchessisbetter it is possible if your king is on h8 and your pawn on g6 and then your opponents king is on h6 and the Knight mates on g6

ah, thank you

Here is a series of legal moves that leads to checkmate

and here is another series of legal moves