Starting position - mate using one piece

Check mate black by moving one piece(of white)

Note: black will only make a turn(move) when checked.

so in conclusion, this is not a legal chess game, the piece you can move can only be a knight or a pawn

According to your note, wouldn't that mean black moves first?

I think I understand now

What's to stop me from (say) ...Nxd2 and moving the white Q?

I'm not really understanding the instructions. Still, is this the right interpretation?

White seriesmates black moving only 1 unit: d2-d4-d5-d6xc7xd8=N-c6xb8xd7-c5-a6-c7#.

Sorry, i mean black will only make a turn when black king is checked

Ramellion, i havnt thought that there is another solution to the one i know,,

nice one...

3.d6 4.dc7 5.cb8R 6.Rxb7 7.Rxd7 8.Rxd8# is even faster.

A more interesting one that I accidentally thought about (because weird interpretation of the above) is that Black moves, and at the end Black checks White such that White's reply mates Black. However, this completely disregards the one piece condition; I don't know what I was thinking.

what i know is that rook