I hope this is a little more difficult 
Ultimate Chess Problems by Vins - problem n.5
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You have to specify what a pawn on d8 means, whether White's "first" move is to promote d8 to something, whether the other White pawns will also stay pawns upon reaching the eighth rank or still be able to promote...
An avalanche of promotions!
except the pawn who is already arrived in the 8th crosspiece (d8), locked.
Hey! after 24 hours, still no one has found the solution? 
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"Why not?"
Moves: 6
Difficolty 1/5: 3
the whole series on my personal web site
www.vinsart.it /graphic