Mate in 8 in which every move is an underpromotion to knight

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silverfux

I am looking for this problem, which exists and I have seen before but cannot find now.  Any help? 

weihou0

??

silverfux

I found it.  

Arnaut10

Try in puzzles

AussieMatey

Methinks the silverfux was flummoxed.

silverfux

Here is the problem I was looking for White mates in 8.