With a black pawn at g2 the solution is unique, but the double dual at move 3 (3.Na6+, 3.d8=Q+ and 3.d8=B+ all lead to the same mate) is not cured. Not a biggie for such a problem, but still a flaw.
A Mate in 12
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Apologies I cannot get it in puzzle form this time. I do not know why.
Okay, I'll do it for you. Here is the puzzle:
Thank you for your help, comments and support.