# 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. Please feel free to drop me a note on the side of the page or try the Facebook
comment box. Or you can email me directly at andrew@str8ts.com.
**Post a Comment or Question here...**

## Tuesday 18-Dec-2012

## ... by: Gerald, USA - California

Could you please take a look at the one of the examples from the strategy page: X-Wing Strategy. When I load X-Wing example1: Load Example into the solver, it looks nothing like the printed example. I entered the printed example into the solver and then compared it with the loaded example from the strategy page. It looks to me as if one is the inverse of the other.

Here's what I mean: X-Wing 1 - X-WIng 2

thanks,

-gerald asp.

Thanks for pointing it out and have a great Christmas

## Friday 14-Dec-2012

## ... by: Parsi, San Francisco Bay Area

## Monday 10-Dec-2012

## ... by: Pat OMahony, Dallas, Texas, USA

I just want to say (again) Thank You for all your efforts.

Season's Greetings.

Patrick John OMahony

## Sunday 2-Dec-2012

## ... by: Malcolm, London UK

## Saturday 1-Dec-2012

## ... by: zyg, uk

Load Sudoku: CLICK TO LOADCould you please explain the strategy you use to solve the first step when there is more than one candidate for a cell in a square.

Your answer come up as 9 in row 5 column 3.

But 9 is also possible in this square in rows 4 and 5 of column 1.

I also cannot follow how you allocate 3 to the next solution.

Any help really appreciated

Regards

Zyg

Have a look on this page.

## Friday 30-Nov-2012

## ... by: Raymond J. Filsell, UK

## Tuesday 27-Nov-2012

## ... by: d, United States

Thinking about MULTI-COLOURING-of -Simple- chains :

Is it possible to have MULTI-COLOURED- ALTERNAING- INFERENCE- CHAINS or does that simply reduce to 3D Medusa ?

## Wednesday 21-Nov-2012

## ... by: Dale Kloss, United States

So you covered cases of:

Canidate ON/OFF (Digit Forcing Chains)

Canidate ON (Nishio Forcing Chains)

So what technique is (if any)

Canidate OFF

or am I missing a technique ?

## Wednesday 14-Nov-2012

## ... by: maskerj, California

## Sunday 21-Oct-2012

## ... by: Hache, France

Load Sudoku: CLICK TO LOADUsing the grader, the puzzle is rated moderate 79 but it contains an X-cycle which I have not yet got my head around. How does it rate at only moderate?

Thanks

Hache

More here if you are interested:

Sudoku Creation and Grading