[Retros] Cherchez la FEN (not as easy as before!)

[Juha Saukkola]

Thanks! Those solutions are absolutely beautiful!

LähetettyOutlook for Android<https://aka.ms/AAb9ysg>
________________________________
From: Retros <retros-bounces at janko.at> on behalf of Éric Angelini via Retros <retros at janko.at>
Sent: Sunday, February 11, 2024 8:50:15 AM
To: The Retrograde Analysis Mailing List <retros at janko.at>
Cc: Éric Angelini <eric.angelini at skynet.be>
Subject: Re: [Retros] Cherchez la FEN (not as easy as before!)

Hi Juba,
I guess 6.0 can not be beaten, indeed!
The next challenge is:
If the numbers 1, 2, 3, 4, 5, 6, 7 and 8
have to be present in the FEN (and only
them) _in this order_, what is the minimal
number of moves needed?
Both answers to the former challenge
and this one are on my personal blog:
http://cinquantesignes.blogspot.com/2024/01/cherchez-la-fen.html
Best,
É.
Catapulté de mon aPhone


Le 11 févr. 2024 à 04:28, Juha Saukkola <juha_saukkola at hotmail.com> a écrit :


I found 6.0 PG's, but there are ugly problem in one square. Is shorter possible?

LähetettyOutlook for Android<https://aka.ms/AAb9ysg>uha
________________________________
From: Retros <retros-bounces at janko.at> on behalf of Éric Angelini via Retros <retros at janko.at>
Sent: Tuesday, January 30, 2024 2:17:10 AM
To: Retros at janko.at <Retros at janko.at>
Cc: Éric Angelini <eric.angelini at skynet.be>
Subject: [Retros] Cherchez la FEN (not as easy as before!)

What is the minimum number of moves that must be played in a chess game so that the FEN<https://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation> of the position reached has exactly 8 numbers – these numbers being 1, 2, 3, 4, 5, 6, 7 and 8 (not necessarily in this order)?
Best,
É.


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