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 email@example.com.
Post a Comment or Question here...
Thank-you everyone for all your questions and contributions.
... 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 for pointing it out and have a great Christmas
... by: Parsi, San Francisco Bay Area
... by: Pat OMahony, Dallas, Texas, USA
I just want to say (again) Thank You for all your efforts.
Patrick John OMahony
... by: Malcolm, London UK
... by: zyg, ukLoad Sudoku: CLICK TO LOAD
Could 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
Have a look on this page.
... by: Raymond J. Filsell, UK
... 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 ?
... 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)
or am I missing a technique ?
... by: maskerj, California
... by: Hache, FranceLoad Sudoku: CLICK TO LOAD
Using 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?
More here if you are interested:
Sudoku Creation and Grading