The New Sudoku Players' Forum

[volcan]

HELP !!! Can't finish the one !:(

images.kodakgallery.eu.com/photos144/9/45/99/18/24/0/24189945933_0_ALB.jpg

[Pat]

what exactly can't you finish??

r8c7 = 6;

now in r1,
fill in the 6,4,8

~ Pat

[QBasicMac]

First of all, PLEASE, PLEASE, do not post images. I couldn't even see the image without doing View Source and then following the URL. And then there is this large useless art work. Much better is to post simple characters as show below.

Here is your puzzle with original correct pencilmarks, assuming your placed numbers are correct:

Code: Select all

+---------+----------------+-----------+
| 9  1  2 | 48   468   68  | 5    3  7 |
| 8  4  7 | 35   23    25  | 6    1  9 |
| 6  5  3 | 7    9     1   | 8    4  2 |
+---------+----------------+-----------+
| 7  6  5 | 138  1238  28  | 123  9  4 |
| 3  8  9 | 6    12    4   | 12   7  5 |
| 1  2  4 | 359  37    579 | 3    6  8 |
+---------+----------------+-----------+
| 4  7  6 | 2    5     3   | 9    8  1 |
| 5  9  8 | 14   146   6   | 7    2  3 |
| 2  3  1 | 89   78    789 | 4    5  6 |
+---------+----------------+-----------+


For some reason, you had not placed two singles:
r6c7=3 and r8c6=6.

When you do, you get some more singles to be placed:
r1c6=8 and r6c5=7.

Keep it up and the puzzle solves itself.

[QBasicMac]

P.S.

Here is what I saw
www.imageviper.com/displayimage/23914/0/ISee.jpg

Mac

[Pat]

volcan's question was posted asan image — i can't imagine why

it would certainly be easier for me to respond if the puzzle were posted as

Code: Select all

[/b] plain text [b]

r8c7 = 6

r8c6 = 6

thanks to QBasicMac for correcting my error!
i seem to be one-off in the row-number or column-number
much too often

~ Pat

[volcan]

Thank you for helping me. I did not get yet the "r8c6 = 6" stuff but I am looking to find out.

Thank you anyway !!!

By the way, why can't I post images ? The first time I looked at my post I could see the picture clearly but this time I couldn't.

Thanks !!!!

[QBasicMac]

1) I did not get yet the "r8c6 = 6" stuff
2) By the way, why can't I post images ? The first time I looked at my post I could see the picture clearly but this time I couldn't.

1) Your cell at row 8 column 6 contains only one pencilmark: 6. That means you MUST place a 6 in that cell. "r8c6=6" is just a way to say "Convert the pencilmark 6 in r8c6 to a final placed inkmark 6".

2) Please don't post images. They are very hard to work with even if they work. That is because we want to copy them and make changes, etc. but you can't do that with an image. Look around. You will rarely find images here and when you do, it is normally a colored one to explain some technique. Nobody posts an image of a puzzle they want help on. PRETTY PLEASE!

Mac

[Cec]

Thank you for helping me. I did not get yet the "r8c6 = 6" stuff but I am looking to find out..."

Hi volcan,
I know I've came in on this late but a possible explanation to help you understand the "r8c6=6 stuff" - you will see in QBasicMac's above candidate grid that a "hidden pair"[14] appears in row8 columns 4 & 5. This means these are the only two candidates that can occupy either of these two cells which therefore excludes candidate 6 from r8c5 leaving r8c6 as the only possible cell for the 6.
For further explanation of a "hidden pair" and other solving techniques click on here and here .

Cec

[Animator]

First of all, PLEASE, PLEASE, do not post images. I couldn't even see the image without doing View Source and then following the URL.

Lucky you. I can't even view the image. (All I get is a 403 Forbidden error).

Now guess why I'm completly against posting images for simple grids?

[volcan]

Thank you all for your patient with a newbye !!!

And thank you for the link to better understanding of solving sudoku puzzle !

Marc.

[Pat]

I couldn't even see the image without doing View Source and then following the URL.

Lucky you. I can't even view the image. (All I get is a 403 Forbidden error).

Now guess why I'm completly against posting images for simple grids?

yes!
initially i was able to see the image, and thus i did respond
(though i much prefer the questions be posted as [code] plain text [/code]).
and now, the image has vanished.

a possible explanation to help you understand the "r8c6=6 stuff" - you will see in QBasicMac's above candidate grid that a "hidden pair"[14] appears in row8 columns 4 & 5. This means these are the only two candidates that can occupy either of these two cells which therefore excludes candidate 6 from r8c5 leaving r8c6 as the only possible cell for the 6.

r8 has 6 cells filled and only needs 1,4,6

c6 already has 1,4

hence r8c6 can only be 6

~ Pat

[Cec]

"... hence r8c6 can only be 6..."

".. This means these are the only two candidates that can occupy either of these two cells which therefore excludes candidate 6 from r8c5 leaving r8c6 as the only possible cell for the 6."

It seems we both reached the same conclusion as to where the 6 should go - just a different path

Because volcan's first post failed to correctly display the initial grid the above candidate grid was confusing as it showed a [6] in r8c6 and also another '6' as a candidate in r8c5. I concluded there was something wrong as subsequently confirmed by a PM from another member who concluded the [6] had been omitted in the initial "image" post.

I decided to use the candidate "presentation" as it was shown in row 8 to explain to volcan how understanding the "hidden pair" technique can lead to other candidate(s) being excluded from the same row (or column or box). I hope I've cleared up this matter.

Cec