[Retros] Building a FEN of itself (update)

[Éric Angelini]

Hi all,
I got a few remarks about that – which led me to this update
where one simple question replaces 6 steps!-)
https://cinquantesignes.blogspot.com/2024/01/building-fen-of-itself-in-6-steps.html 
<https://cinquantesignes.blogspot.com/2024/01/building-fen-of-itself-in-6-steps.html>
Best,
É.
 
------ Message d'origine ------
De: retros at janko.at
To: Retros at janko.at Cc: eric.angelini at skynet.be
Envoyé: samedi 13 janvier 2024 21:26
Objet: [Retros] Building a FEN of itself
https://cinquantesignes.blogspot.com/2024/01/building-fen-of-itself-in-6-steps.html?m=1 
<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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