The New Sudoku Players' Forum

[MntyPythn858]

They're great fun. I used the cross hatching method to solve them.

[lunababy_moonchild]

Hello and welcome to the Forum.

Well done on your solving

Luna

[PatmaxDaddy]

I have a confession: I've been working on Sudoku math since last August, and I've managed to post a few results, but I've never actually solved a Sudoku puzzle. The first thing I did after discovering Sudoku was to write a program to solve the puzzles, and once I had created a purely mechanical procedure that always finds a solution, I never developed any interest in solving them by hand. But given all the world-wide passion for the puzzle, I suppose I'm missing something.

[Smythe Dakota]

.... The first thing I did .... was to write a program to solve the puzzles ....

Does your program also establish uniqueness, or does it stop as soon as it finds one solution?

Bill Smythe

[deam3r]

.... The first thing I did .... was to write a program to solve the puzzles ....

Does your program also establish uniqueness, or does it stop as soon as it finds one solution?

Bill Smythe

That's true, I'm a fan of Sudoku and I wan't to no if... What Smythe Dakota said.

[PatmaxDaddy]

Does your program also establish uniqueness, or does it stop as soon as it finds one solution?

It can stop after finding the first one, or find them all (and thereby establish uniqueness). Note that Sudoku solver programs have been around for a long time, so this is hardly noteworthy.

I am curious, however, if there are others like me who enjoy the math but have never tried the puzzle.

[lunababy_moonchild]

I am curious, however, if there are others like me who enjoy the math but have never tried the puzzle.

Yes, there are. Try the Programmer's Forum - you'll have to find that yourself - or SadMan Software

Luna

[Chessmaster]

good job on solving your 1st puzzle. the only problem is you can not stop now. you are addicted to sudoku

[MntyPythn858]

You're right. I am addicted now.

[ab]

Does your program also establish uniqueness, or does it stop as soon as it finds one solution?
Bill Smythe

That's a strange question. If the program uses logic to find a solution, then if it finds a solution, it is de facto unique.

[tarek]

Does your program also establish uniqueness, or does it stop as soon as it finds one solution?
Bill Smythe

That's a strange question. If the program uses logic to find a solution, then if it finds a solution, it is de facto unique.

That is unless you you base your logic on the fact that the puzzle has a unique solution when it actually has many.

[ab]

That is unless you you base your logic on the fact that the puzzle has a unique solution when it actually has many.

methinks you refer to the strategy of if you have pairs at the corners of a rectangle except one cell has a third number, or summit like that. If you have read my responses to those posts you'll know that I don't approve of that strategy. Can't think of any other strategies that have been discussed here that assume a unique puzzle, but I don't read a lot of the posts, so I may have missed something.

[tarek]

methinks you refer to the strategy of if you have pairs at the corners of a rectangle except one cell has a third number, or summit like that.

You are right, however it doesn't just stop there. These methods include: Unique rectangles, Almost unique rectangles, BUG principle amongst others..........

Tarek