done, first guess

Done. 1 guess.

start todays expert

ding, first guess again

done

Saturday's was a beast - three levels of guesses needed

g/ng - chain of pairs that leads to contradiction; does that have a name?

Laxative, maybe? Or is that eating chains of pears to relieve constipation?

Go

Done, 5 guesses

@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

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

done