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 firstname.lastname@example.org.
Post a Comment or Question here...
Thank-you everyone for all your questions and contributions.
... by: RIZDINA, USA
... by: julie, Australia
... by: Ken Rizzo, Ft. Mill, SC - Just South of Charlotte NC
... by: joconnor, US - Bailey, Colorado
Interesting question. It depends on your definition of a proper sudoku. If there are insufficient clues then you will have more than one solution, although any solution that fills the board and satisfies the rules could be said to be a completed sudoku. We make the choice that a sudoku should have only one solution to make it a satisfactory puzzle. Multiple solutions while valid in the logical sense are frsutrating to the puzzle solver who does not expect this nor wishes to find all solutions.
Unique rectangles take advantage of the implicit agreement between the puzzle maker and the puzzle solver that there will only be one solution. Sometimes its explicit - as in my introductions to puzzle books or in my packs. So you could incorporate the statement of one solution into the rules and therefore the deadly pattern leads to 'invalid' as opposed to 'alternative' solutions.
URs are very common in the harder puzzles and well worth looking into, but will break your solving route if the puzzle is faulty, which is why I included the "Solution Count" on my solver as a check.
... by: jbm, California
... by: Bob Spessard, USA
The order of the strategies is only roughly in order of complexity, there's a certain amount of user preference and that’s my list. I'd like to offer the chance of re-ordering them but it’s a bit of a programming job. So I don't disagree with you
... by: Paul, London, England
I've just downloaded Chrome to confirm this problem. Previously was replying on user reports who said the solver worked fine in Chrome. I've done some research and testing - its not the page, its definitely a short coming with the browser. Button simple do not show focus when you have focus on them. Nor does enter key activate them. I hope they fix it with the next release. It is a very new browser.
Thanks for the alert
... by: suchita chaturvedi, india,asia
... by: Pat Williams, USALoad Sudoku: CLICK TO LOAD
... by: gkelly, layton, utLoad Sudoku: CLICK TO LOAD