The first one was nice, the second one was simple (and there are alternative solutions), the third one was crazy, I just gave up and hit solution untill white's last two moves.
Tricky Knight Puzzles
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what if he promoted his pawn to a queen
queen is mate in 1
good point
Two knights vs a king is generally a draw, but if the king has an extra pawn or piece, it is a different matter entirely.