[Retros] Building a FEN of itself

[Éric Angelini]

https://cinquantesignes.blogspot.com/2024/01/building-fen-of-itself-in-6-steps.html?m=1
(…)
What is the minimum number of moves it takes
to produce a FEN of itself from the starting 
position in an orthodox chess game?
Best,
É.
(my apologies if this is old hat)
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