Questions regarding WSC round 5 - Arrows, Lines and Circles

[Fred76]

Hi,

I noticed while looking at the IB that you used a palindrome sudoku which I've created. It is not a WPF sudoku. You'll find it on my blog with reference to the competition in which it appears initially.
Can you add my name in the credit section in the next version of IB?

Thanks,
Fred

We took this example from the Instruction Booklet of the Dutch Grand Prix Round in 2016 (and maybe it's used more often, I don't know; we started with our own rounds), so we believed it is a WPF-puzzle.

Yes, I know there is an ambiguity regarding how the WPF uses some puzzles in past GP rounds IB (they don't even follow recommandations of WPF on this subject...).
I just wanted to clarify this ambiguity. It is not a WPF sudoku, it is a Fred Stalder sudoku.