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...
Thursday 17-Mar-2011
... by: zweibieren, Pittsburgh PA USA
And if I remove them, it puts them back.
Using Firefox 3.6.15
Having scroll bars within the page is awkward. My browser also has scroll bars and the two collaborate to make navigation difficult.
Wednesday 9-Mar-2011
... by: Sandy H, Chicago, IL
Tuesday 8-Mar-2011
... by: Alan, South West England
Monday 7-Mar-2011
... by: Lewis, Montreal
Monday 7-Mar-2011
... by: Philip Khew, Malaysia
Load Sudoku: CLICK TO LOADRotating a puzzle manually can also introduce errors.
I will today or tomorrow introduce a new version of the solver with a couple of left and right rotate 90 degrees buttons. Theoretically it should lead to the same solution and strategies used but the practice will be interesting. Often the search for an elimination on the tougher strategies will return the first instance of a result, but it searches top left to button right, so it may cause branching in a different direction
Sunday 6-Mar-2011
... by: JULIO, SPAIN
If not, can you implemented it.
thank`s and regards.
Julio
Friday 4-Mar-2011
... by: CynJ1171, Connecticut-USA
On a side note- I adore Str8ts and Killer (although these take me forever to finish!)!
~CynJ1171
However, I am aware of this problem and it's not something I should leave to the users awareness. I will be implementing a auto-save cookie soon so that the current game is always re-loaded. This might break if you try and have two puzzles in two windows, but we'll see
Friday 25-Feb-2011
... by: Ilmārs Cīrulis, Latvia
Load Sudoku: CLICK TO LOADSINGLE: D5 set to 1, unique in Row
SINGLE: E6 set to 2, unique in Row
But there is bug in the second step:
SINGLE: C5 set to 2, unique in Column
SINGLE: E4 set to 3, unique in Row
SINGLE: E7 set to 7, unique in Row (Here!)
SINGLE: F2 set to 1, unique in Row
SINGLE: G8 set to 1, unique in Row
SINGLE: H4 set to 1, unique in Column
E7 can be set to 7 only after setting E4 to 3 (it means, E7 can be solved only in the next step, not this).
Friday 25-Feb-2011
... by: kmor, Ireland
Have a read of this:
http://www.sudokuwiki.org/Crooks_Algorithm
and I quote myself here:
"The whole idea of logical strategies is that we want to find a pattern or reason for making an elimination and/or solution at every point in the puzzle. I, and many others, are against the idea of guessing, or trialling a candidate and seeing if it produces an error. Mr. Crook has made an good attempt at showing how paper and pencil methods are perfectly viable and his paper does bring formality to the simpler aspects of the puzzle, but this is not the Holy Grail.
In a nutshell, Mr. Crook confuses a priori knowledge with a posteriori knowledge. His solution is gained through experience of the puzzle – the exploring of the paths and finding out which numbers don’t violate the rules. This is an a posteriori method. Logical strategists such as myself are looking for rules which give us surety before confirmation – an a priori method where we deduce the correct answer because we have identified a pattern that equates to a rule. Crook's theorems are such rules and are good solid a priori stuff - but he fails to show how to identify preemptive sets in ALL situations and resorts to guessing."
Tuesday 22-Feb-2011
... by: JD, Maryland, USA
Saturday 5-Feb-2011
... by: Bill Harrison, Virginia, USA
I want to express my appreciation for your outstanding website that makes it possible for me to analyze and modify my Sudoku solutions. I attacked (and solved) my first Sudoku puzzle in the Richmond, Virginia, newspaper at Christmas time in 2009; so you see, I am a quite recent entrant into this particular puzzle genre.
Having gotten hooked, I solved the daily Sudokus until around the middle of last year. As a programmer I began to think that creating the puzzles themselves would prove more challenging than simply solving someone elses'.
My computer printed out my first successful 81-digit Sudoku last July. However, creating a 30-or-so digits puzzle by randomly knocking out 50-or-so digits from my Sudokus has turned out to be rather frustrating. It was too easy to generate a redundant (i.e. non-unique) puzzle. But your Sudoku Solver has helped me immeasurably!
Entering my trial puzzles into your solver, I can judge their levels of difficulty by how many of your 35 strategies are needed to solve them. Also, it is relatively easy to see the puzzle combinations that cause trouble (and redundancy) by stepping through your strategies and then tweaking the puzzle distributions slightly to "fix" any difficulties.
Again, thanks so very much for your splendid site!
Best regards,
Bill Harrison
f8bill@gmail.com
Best of luck