by **Guest** » Fri Mar 11, 2005 3:29 pm

I found one of the Times' ones a few weeks ago that I couldn't solve (Friday, surprise, surprise), so I decided to take a stab as to which of 2 possibles should go in a square that I was sure would unlock the puzzle. I do the Difficult/Fiendish ones in an Excel grid, so I can undo... I set all the squares I had not filled in to red font and carried on. It came out straight away. Just for grins, I deleted all the red numbers and tried the other number... It came out again! Since then, I've seen 2 or 3 that come out in 2 or more possible ways.

It doesn't always happen, of course, but I have to wonder whether the checkers for the competitions always check that a valid solution has been provided, rather than just comparing with their own one?

[Administrator: See the Solving Techniques forum ("Solving with Excel") for a continuation of the Excel discussion]