[Retros] Draughts proofgame

[Juha Saukkola]

Very challenging problem, because with trivial setting it's possible to get
64 moves (K=12, P's=21, R's=11, B's=6, Q=4, N's=10) when wK is in a8

and black opens only d7-d6 and g7-g5. So some kind of mutual stucked
position is needed.


It's unbelievable, if this haven't thought earlier! 


It's not trivial to calculate moves in stucked positions, but maybe Popeye's
A->B helps a lot.


> From: yoavbz97 at gmail.com

> To: retros at janko.at

> Date: Sun, 2 Jun 2013 23:56:48 +0300

> Subject: [Retros]  Draughts proofgame

> 

> 

> What is the length record for a no-capture non-unique Shortest Proof Game in

> Chess?

> 

> The best I could find in PDB is P0008074 which has an entirely different

> intention and stipulation. I constructed a proof game for this position in

> 78.5 moves. It might be possible to shorten this by several moves but in any

> case Problems constructed with the record in mind should improve on this

> number considerably. 

> 

> My search in PDB gives the record for unique SPG as 57.5 moves in P0000136,

> unique no-capture SPG as 43.0 moves in P0002554, non-unique SPG as 183.0

> moves in the classical collaboration between Ceriani and Fabel P0001951. The

> answer to the above question is needed to complete the list.

> 

> Yoav Ben-Zvi

> 

> -----Original Message-----

> From: Joost de Heer [mailto:joost at sanguis.xs4all.nl] 

> Sent: Saturday, June 01, 2013 1:25 PM

> To: The Retrograde Analysis Mailing List

> Subject: [Retros] Draughts proofgame

> 

> Hello,

> 

> I thought that maybe some people would find this interesting: a proofgame in

> draughts. Not an exact proofgame unfortunately, these are almost impossible

> to realise.

> 

> http://laatste.info/bb3/viewtopic.php?f=65&t=276&start=225#p99885

> 

> This is the longest possible game without captures or promotions.

> 

> Joost

> 

> 

> -----

> No virus found in this message.

> Checked by AVG - www.avg.com

> Version: 2013.0.2904 / Virus Database: 3184/6371 - Release Date: 05/31/13

> 

> _______________________________________________

> Retros mailing list

> Retros at janko.at

> http://www.pairlist.net/mailman/listinfo/retros

 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/retros/attachments/20130603/9fb91e17/attachment.htm>