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Post the puzzle or solving technique that's causing you trouble and someone will help

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Postby thelevpoke24 » Fri Feb 22, 2008 1:41 am

Hello everyone,

I've done a few puzzles, maybe 2 or 3, and am still getting the hang of it.I havent really figured out a decent method on how to do them, its more just a shot in the dark. I have the application on my iphone, and it doesnt tell you the level or difficulty for the puzzle, or let you save and go back to it, so im kinda in the dark, and only have one shot. But this one looked so easy, so i started, got in alittle, and am stuck beyond believe. I was wondering if you guys could take a look at it and maybe give your imput on the difficulty of this puzzle. i cant finish it on my iphone, because i exited it, but ihave it saved to my computer, so i can do it by hand. Any help would be appreciated. Is this a hard one? or am i still too young at the sudoku game?

Ive marked in red which ones i know are correct, and thats as far as i have gotten without guessing.

Image
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Postby ArkieTech » Fri Feb 22, 2008 4:33 am

thelevpone24 said:
Any help would be appreciated. Is this a hard one?


Sorry. I got messed up on your grid by staring at the beginning. Your are stuck in need of a pattern called a Sue Du Cog
Code: Select all
 *-----------------------------------------------------------*
 | 4    B89    37-89 | 2     1     58    | 35    6     79    |
 |A19    16    36-9  | 39    7     45    | 45    8     2     |
 |AB789  5     2     | 39    6     48    | 134   13    79    |
 |-------------------+-------------------+-------------------|
 | 5     28    1     | 6     38    9     | 7     23    4     |
 | 6     7     48    | 14    38    2     | 13    9     5     |
 | 3     29    49    | 14    5     7     | 8     12    6     |
 |-------------------+-------------------+-------------------|
 | 89-7  16    789   | 78    4     16    | 2     5     3     |
 |A17    3     567   | 57    2     16    | 9     4     8     |
 | 2     4     58    | 58    9     3     | 6     7     1     |
 *-----------------------------------------------------------*
Sue De Cog Column 1 has a subset (A)1789 => r7c1<>7
Box 1 has a subset 89 in (B) => r12c3<>89


This must be followed by an xy chain -- more on that later..

edit added.....

dan
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Postby thelevpoke24 » Fri Feb 22, 2008 8:53 am

sorry, im still new and dont really follow. But thanks for the advice so far anyways
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Too Tough

Postby Pat » Fri Feb 22, 2008 9:43 am

thelevpoke24 wrote:I've done a few puzzles, maybe 2 or 3, and am still getting the hang of it. I havent really figured out a decent method on how to do them, its more just a shot in the dark.

I have the application on my iphone, and it doesnt tell you the level or difficulty for the puzzle, or let you save and go back to it, so im kinda in the dark, and only have one shot.

But this one looked so easy, so i started, got in alittle, and am stuck beyond believe.

I was wondering if you guys could take a look at it and maybe give your input on the difficulty of this puzzle.

i cant finish it on my iphone, because i exited it, but ihave it saved to my computer, so i can do it by hand.

Any help would be appreciated. Is this a hard one? or am i still too young at the sudoku game?

Code: Select all
 4 . . | 2 1 . | . 6 .
 . . . | . 7 . | . 8 .
 . 5 2 | . 6 . | . . .
-------+-------+------
 . . 1 | 6 . . | . . 4
 6 7 . | . . . | . 9 5
 3 . . | . . 7 | 8 . .
-------+-------+------
 . . . | . 4 . | 2 5 .
 . 3 . | . 2 . | . . .
 . 4 . | . 9 3 | . . 1





hi thelevpoke24,

what ArkieTech is trying to tell you, is that this puzzle is indeed too tough for a beginner.
probably too tough for me too.
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Re: New

Postby Cec » Fri Feb 22, 2008 10:34 am

thelevpoke24 wrote:"....I've done a few puzzles, maybe 2 or 3, and am still getting the hang of it. I havent really figured out a decent method on how to do them, its more just a shot in the dark...."

Hi thelevpoke24,

For newcomers like yourself, the Forum includes numerous links describing many solving techniques ranging from 'basic' to 'advanced'. The following links are suggested:

http://www.angusj.com/sudoku/hints.php
http://www.sadmansoftware.com/sudoku/techniques.htm
http://www.scanraid.com/BasicStrategies.htm

Good luck with your homework:)

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Postby eleven » Fri Feb 22, 2008 12:21 pm

In row 5 only col 6 can be 2. Then r4c6 only can be 9 (38 in r45c5).

But then it is awkward also with grid.

Code: Select all
 *-----------------------------------------------------------*
 | 4     89    3789  | 2     1     58    | 35    6     79    |
 | 19    16    369   | 39    7     45    | 45    8     2     |
 | 789   5     2     | 39    6     48    | 134   13    79    |
 |-------------------+-------------------+-------------------|
 | 5     28    1     | 6     38    9     | 7     23    4     |
 | 6     7     48    | 14    38    2     | 13    9     5     |
 | 3     29    49    | 14    5     7     | 8     12    6     |
 |-------------------+-------------------+-------------------|
 | 789   16    789   | 78    4     16    | 2     5     3     |
 | 17    3     567   | 57    2     16    | 9     4     8     |
 | 2     4     58    | 58    9     3     | 6     7     1     |
 *-----------------------------------------------------------*
I tried to use the 79 uniqueness pattern, but only saw r1c3<>9.
Also nothing with pairs 16, 48, 58.

Finally i used the link for 7 in box 1:
r3c1=7 or
r1c3=7 -> r1c9=9 ->r1c2=8
So r3c1 cannot be 8.

Other solution with link 9 in column 9:
r3c9=9 -> r3c4=3 -> r3c8=1 -> r6c8=2 -> r6c2=9
So r1c9=9 or r6c2=9, i.e r1c2=8
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