# Feedback and Questions

I've received a lot of interesting comments and questions from Sudoku fans over the last few years and this page
is where I try to answer them. I'm also directing Str8ts feedback here. Please feel free to drop me a note on the side of the page. Or you can email me directly at andrew@str8ts.com.
**Post a Comment or Question here...**
## Tuesday 20-Sep-2011

## ... by: Larry, Georgia - USA

## Thursday 15-Sep-2011

## ... by: Becko, Germany

yetsterday (14.09.2011) i solved the daily Jigsaw, but when finished, 26 conflicts were reported. This morning i compared my solution, which have printed out, with the online solution and they are the same ???

with regards

Becko

## Thursday 8-Sep-2011

## ... by: Alistair, Canada

recently I got ambitious and tried your diabolical competion from Aug 6

I managed to solve it however I have not yet learned diabolical strategies. I confirmed my solution to be correct on you Sudoku Solver. I stepped through this puzzle on your sudoku solver to see the strategies used and am sure I could not have used those strategies.

Is it possible to solve the competition Aug 6 using simple strategies??

## Thursday 1-Sep-2011

## ... by: Fred Peyerl, USA

## Wednesday 24-Aug-2011

## ... by: Hache, France, Europe

I think this site is fantastic. By keying in my unsolved grids and following the solution through step by step I am learning the more complex solving techniques which I was struggling with before. One question: how are the overall scores for grading worked out. Yesterday I had a puzzle which had a score of 182, today I have one with a score of 174. Does that make today's puzzle slightly easier though they are both rated as tough?

Many thanks,

Hache

## Tuesday 23-Aug-2011

## ... by: Ivar, Norway

Load Sudoku: CLICK TO LOADThe attached Sudoku is a Colour Sudoku, and while using your solver on it when I got stuck I noticed that your solver lacks a rather simple Colour/Line Reduction technique, which should be one of the top techniques, likely #8 on the list (under 7 Box/Line Reduction).

In the attached Sudoku the technique wouldn't help much, but it might on other puzzles. To elaborate; if you check line A, the 6's in A8 and A9, the only 6's in box 3, eliminates the 6 in the purple A4. Moving on to line D, there are 6's in the purple D1 and D4. All the other purple cells are either solved or lacking 6 as a candidate, so logically line D MUST have 6 in either D1 or D4; the 6's in D2 and D9 can be eliminated. This your current version of the solver doesn't do at the moment... Like I said, eliminating those 6's in this puzzle doesn't help much, but in other puzzles it might very well be a solving move...

Just thought you should know, it aught not be impossible to implement. ;)

Thanks for this fantastic solver!

Ivar

## Monday 22-Aug-2011

## ... by: Chuck, Virginia

I really like the option of being able to put "The Daily Sudoku" into the solver and printing it out with the candidates already in place. However, this option isn't available for the "30 Day Archive" puzzles. Would you consider adding that option to the archive puzzles as well?

Thanks,

Chuck Bruno

Update: Feature now available - see the bottom of the page

## Thursday 18-Aug-2011

## ... by: Andreas von Delius, Germany

Load Sudoku: CLICK TO LOADmay be, this will interest you to develop your wonderful solvers. I tried this puzzle with your Sudoku solver. It shows a 9 in B9 by a Digit Forcing Chain. But it does not find before the off chain AIC, which you have in the same circle by ignoring B9, like it should:

-6(A8)+6(A3)-6(C1)+6(H1)-2(H1)+2(H7)-2(G8)+2(A8)

Using this, you may take 4 and 9 from A8 and 8 and 9 from H1 and the puzzle becomes immediately quite easy.

Andreas

Very nice addition, well spotted, and many thanks.

## Monday 8-Aug-2011

## ... by: Dale Kloss, USA, Oregon, Portland

Update: Jigsaw Puzzle Packs now available! yay

## Monday 25-Jul-2011

## ... by: oui4, Canada

## Monday 18-Jul-2011

## ... by: Riddick51PB, Lincoln, Nebraska USA