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Difficulty: Expert Sunday, November 5, 2017

Not Completed Play This Puzzle

CHAT LOG for Sunday, November 5, 2017

12:04 am
Phil

done, first guess
12:32 am
JeffysMom

Done. 1 guess.
1:46 am
Phil

start todays expert
1:58 am
Phil

ding, first guess again
5:59 am
tincup

done
8:43 am
spellacked

Saturday's was a beast - three levels of guesses needed
11:55 am
MrOoijer

g/ng - chain of pairs that leads to contradiction; does that have a name?
2:44 pm
TallMike

Laxative, maybe? Or is that eating chains of pears to relieve constipation?
3:11 pm
WHB

Go
3:39 pm
WHB

Done, 5 guesses
4:37 pm
drwho

@Tuco: interesting link if only for his reference to a paper proving that a minimum of 17 clues are required for a proper 9x9 sudoku puzzle.

https://arxiv.org/pdf/1201.0749.pdf
5:29 pm
drwho

Concerning the minimum clues problem:

“If you can figure it out, you will be a rock star in the universe of people who care about such things. Granted, that is a far smaller universe than the one full of people who care about actual rock stars, but still, it would be great.”

Taking Sudoku Seriously, Rosenhouse & Taalman
6:43 pm
Cinna

done