The hardest sudokus (new thread)

Everything about Sudoku that doesn't fit in one of the other sections

Re: The hardest sudokus (new thread)

Postby mith » Wed Sep 16, 2020 1:47 pm

Yes, I agree, thus the quotes around hardest.

What I mean though is that among the puzzles in my previous post, it's one of the few with high SER that doesn't appear to have something like an MSLS or an Exocet that would lower the rating if implemented in SE. (I'd be curious where these fall in the BpB classification though!)
mith
 
Posts: 225
Joined: 14 July 2020

Re: The hardest sudokus (new thread)

Postby denis_berthier » Wed Sep 16, 2020 2:40 pm

mith wrote:Yes, I agree, thus the quotes around hardest.
What I mean though is that among the puzzles in my previous post, it's one of the few with high SER that doesn't appear to have something like an MSLS or an Exocet that would lower the rating if implemented in SE.

I see, thanks

mith wrote:I'd be curious where these fall in the BpB classification though!

The presence of an Exocet is irrelevant to the BpB classification.
There's a relatively strong correlation between it and the SER, as shown in table 11.2, p. 314 of PBCS2. As you have the SERs, this may give you some idea of the BpB classifications of your puzzles.

If you need a precise value, computing the BpB classification may take a long time. I've spent much time long ago doing it for a significant part of the hardest collection. Now, I do it only when I have a good reason (SER >= 11.8), e.g. searching for a possible puzzle that wouldn't be in B7B.

What's new since I made CSP-Rules public (https://github.com/denis-berthier/CSP-Rules-V2.1) is, anyone can now do these computations.
In the SudoRules config file, choose the following settings (by deleting the leading semi-colons on each line
(don't forget to add semi-colons to inactivate the patterns activated by default in section "1) Choose ordinary resolution rules" of the file

Code: Select all
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; 2c) for computing the BpB classification
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;; choose p (here p = 5):
 (bind ?*Whips* TRUE)
 (bind ?*Braids* TRUE)
 (bind ?*whips-max-length* 5)
 (bind ?*braids-max-length* 5)

;;; choose one of the following forms of T&E(1)
 (bind ?*TE1* TRUE) ;;; for T&E at level 1
denis_berthier
2010 Supporter
 
Posts: 1611
Joined: 19 June 2007
Location: Paris

Previous

Return to General