## Sudoku anyone?

### Sudoku anyone?

I'm just a beginner but I've begun to enjoy it. Does anyone have some tips that might make it somewhat easier for a rookie to understand? I do understand the objective of the game, but it seems to be much more challenging than it was at first glance.

Gary

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- rustyblade
- Shaving Paparazzo
**Posts:**10472**Joined:**Sun Oct 23, 2005 5:27 pm**Location:**Ontario

### Re: Sudoku anyone?

This is a game I really want to understand the advanced concepts to learn how to solve difficult puzzles, but it sadly makes me realize that I don’t math well.

Richard

### Re: Sudoku anyone?

I like working the puzzles a lot. I found a couple of apps - and I do the easy ones when I want to let my mind wander. The medium's and hard's require me to put little number in the boxes too much (if you do these you understand that).

I find that often times what does NOT go in the box is as important to know as what does go in the box.

I find that often times what does NOT go in the box is as important to know as what does go in the box.

Gene

"It could probably be shown by facts and figures that there is no distinctly American criminal class except Congress."

Mark Twain

"People shouldn't be afraid of their government. Governments should be afraid of their people."

Alan Moore

"It could probably be shown by facts and figures that there is no distinctly American criminal class except Congress."

Mark Twain

"People shouldn't be afraid of their government. Governments should be afraid of their people."

Alan Moore

### Re: Sudoku anyone?

Sudoku is my 3rd favourite time-killer, after Klondike Solitaire (on my iPod) and Cryptic Crosswords (in paperback book compilations).

I think I'd rather

I think I'd rather

*not*learn tricks to speed up the solution."If this isn't nice, then what is?" - Kurt Vonnegut's Uncle Alex

### Re: Sudoku anyone?

I'm beginning to "see" some options that have taken some time for my subconscious to understand. A couple of days ago I finally finished one with zero mistakes, which was a first for me. Of course I'm still limiting myself to the "easy" ones for the time being.

Gary

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### Re: Sudoku anyone?

To be technical, Sudoku is math, since logic is a branch of math, but it's not quantitative. You could replace the digits with any set of 10 different symbols.

The first thing I do is fill in the easy unfilled squares, ones where it doesn't take too much effort to see there's only one choice of digit. Then I look for two squares in the same square of 9 that are the only possibilities for the same digit, or two squares in the same row or column. That eliminates that digit as a possibility in the rest of that row or column or square of 9. That often gives you some more solved single squares.

At opportune times, I see if I can use a process of elimination to fill in any single squares, mostly when a lot of the nearby squares have been filled in.

A little later, I start marking squares with all digits they might have (I write in the possible digits), looking first for squares with the least number of possibilities. The easiest puzzles have few squares with lots of possibilities.

There's more, but it's hard to write it all down without diagrams and examples. The main thing is to keep in mind that rows, columns, and squares of 9 can't have any repeating digits. Solving the puzzle is by using the consequences of that fact, and figuring out (or learning about) all the possible consequences.

More often than I'd like, I discover an impossibility, which means that I made a mistake. Those have been nearly impossible to repair without erasing all my work.

The first thing I do is fill in the easy unfilled squares, ones where it doesn't take too much effort to see there's only one choice of digit. Then I look for two squares in the same square of 9 that are the only possibilities for the same digit, or two squares in the same row or column. That eliminates that digit as a possibility in the rest of that row or column or square of 9. That often gives you some more solved single squares.

At opportune times, I see if I can use a process of elimination to fill in any single squares, mostly when a lot of the nearby squares have been filled in.

A little later, I start marking squares with all digits they might have (I write in the possible digits), looking first for squares with the least number of possibilities. The easiest puzzles have few squares with lots of possibilities.

There's more, but it's hard to write it all down without diagrams and examples. The main thing is to keep in mind that rows, columns, and squares of 9 can't have any repeating digits. Solving the puzzle is by using the consequences of that fact, and figuring out (or learning about) all the possible consequences.

More often than I'd like, I discover an impossibility, which means that I made a mistake. Those have been nearly impossible to repair without erasing all my work.

### Re: Sudoku anyone?

I've been playing Sudoku for almost 6 months now. I have been depending on my subconscious to begin to figure out what and where to look for the correct results. Identifying the digits and their positions in the overall scheme is the most difficult thing. Training my brain would be a good way to describe it. Pauldog has stated the process very well. I don't know if it's mathematics or just any series of 9, be it alphabet, symbols, or etc. just so the 9 digits are always in place. The

*big secret*that I have learned is that 100% of mistakes are absolutely foreseeable. If I take all the time in the world as I look at the numbers and their positions and relationships, the fact remains that mistakes are absolutely avoidable. Taking a wild guess is tempting, but completely avoidable. This is a game winnable every time if there's no rush. Sometimes I have to pause and get back to it later. What appears to be impossible is entirely avoidable.Gary

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### Re: Sudoku anyone?

On rare occasions I'll do one that's so hard that there doesn't seem to be any way to go forward at a certain point except to guess a square that has two possibilities. I need to mark every square thereafter so I can erase it if I get a contradiction. If that happens, then I change the first square to the other possibility.

That's the only time I guess.

That's the only time I guess.

### Re: Sudoku anyone?

Pauldog, I agree. Often I find myself at what appears to be a dead end with no way out, and after staring at the board or even intentionally distracting myself for a few minutes it seems that my subconscious brain kicks in with a suggestion that opens up a solution. I really don't allow myself to guess because that's almost always wrong in my case.

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- John Bader
**Posts:**2**Joined:**Sun Nov 22, 2020 3:38 pm

### Re: Sudoku anyone?

When I was at hospital I met one man who was mad about sudoku. He explained to me the rules and lately I found out how useful the game was for the brain. Since then I try to play sudoku at least once a week to train my brain to be better at WoW, my current gaming fav if that doesn't help then I go to https://skycoach.gg/wow-boost/dungeons and ask pro gamers for their assistance!

Last edited by John Bader on Mon Dec 07, 2020 5:29 am, edited 1 time in total.

### Re: Sudoku anyone?

My own shortest record time to a solution with zero mistakes is a little over 12 minutes, and usually much longer. The website I see tells me that about 95% of everyone else solves theirs much faster (with zero mistakes) than I do. I just can't even imagine someone solving one of the puzzles with no mistakes that often and that fast. There's got to be something I've been overlooking. But I'll either figure it out or get disgusted and quit.

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### Re: Sudoku anyone?

Overnight my subconscious must have figured something out. It got easier to spot where to put the missing numbers. Maybe this will help speed things up. I understand a lot of folks write possible numbers in the boxes, but I am striving to be able to solve the puzzle without any errors which in my case are just guesses, almost always wrong.

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### Re: Sudoku anyone?

It took me 10 months to discover why everyone on that website can solve every puzzle, no matter how difficult, in record time. There is a pause button and there is also a print button. What those folks do is simple: Go to the website and log on to a new puzzle, immediately push print and immediately after that, push pause. Take as long as you want to solve the puzzle the old fashioned way, then un-pause the puzzle long enough to fill in the solution and hit the finish button. I knew there was something fishy going on! They all cheat.

14January2021 Edit: Yesterday I tested my hypothesis about cheating the crowd. Success! And it made me laugh out loud. It normally takes me anywhere from about 20 minutes up to 35 minutes or longer to solve the puzzle. Considering the fact that the puzzle was paused except long enough for me to print the puzzle and then un-pause it just long enough for me to type in my results, according to the dumb website, it took me only 2 minutes and 22 seconds, and it was hilarious. Only 6% of those who've solved this particular puzzle over the years, even with the cheating, were faster than me. Of course it really took me around 30 minutes to solve the puzzle in

14January2021 Edit: Yesterday I tested my hypothesis about cheating the crowd. Success! And it made me laugh out loud. It normally takes me anywhere from about 20 minutes up to 35 minutes or longer to solve the puzzle. Considering the fact that the puzzle was paused except long enough for me to print the puzzle and then un-pause it just long enough for me to type in my results, according to the dumb website, it took me only 2 minutes and 22 seconds, and it was hilarious. Only 6% of those who've solved this particular puzzle over the years, even with the cheating, were faster than me. Of course it really took me around 30 minutes to solve the puzzle in

*real*time as opposed to*fake*time. I get no satisfaction from lying to an automated and obsequious digital robot. It gives me no satisfaction lying to anyone, ever, of course. I think I will continue to get my puzzles by printing them off at random, and solving them at my own pace with no incentive to report my results to the robot.SOTD 99%: soaps & creams, synthetic / boar / badger brushes, Colonial General razor, Kai & Schick blades, Superior 70 aftershave splash + menthol + 444