Sudoku puzzle. Very hard
Nex digit, please.
And how do you come to it.
Thanks
Javier
168 69 169 / 389 39 7 / 4 5 2
58 59 2 / 89 6 4 / 13 37 17
7 3 4 / 5 2 1 / 68 9 68
+-------------------+-----------------+-----------------+
4 1 569 / 2 39 8 / 7 36 569
36 679 79 / 4 1 5 / 368 2 689
235 259 8 / 39 7 6 / 35 1 4
+-------------------+----------------+------------------+
16 4 16 / 7 5 9 / 2 8 3
25 257 57 / 16 8 3 / 9 4 16
9 8 3 / 16 4 2 / 156 67 1567
+------------------+-----------------+-------------------+
The editing of this message is not correct , I know. How can I do it in a "readable" way
next digit, please
6 posts
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next digit, please
by Javier Cia » Mon Jan 09, 2006 9:14 pm
- Javier Cia
- Posts: 10
- Joined: 02 January 2006
by Animator » Mon Jan 09, 2006 9:23 pm
Did you read: New topics - How to ask for help? The first item in the second list shows a small procedure which you can follow to make it look better. (If you read it: was it too unclear on how to do it?)
Grid with corrected formatting:
Grid with corrected formatting:
- Code: Select all
168 69 169 | 389 39 7 | 4 5 2
58 59 2 | 89 6 4 | 13 37 17
7 3 4 | 5 2 1 | 68 9 68
---------------+------------+---------------
4 1 569 | 2 39 8 | 7 36 569
36 679 79 | 4 1 5 | 368 2 689
235 259 8 | 39 7 6 | 35 1 4
---------------+------------+---------------
16 4 16 | 7 5 9 | 2 8 3
25 257 57 | 16 8 3 | 9 4 16
9 8 3 | 16 4 2 | 156 67 1567
- Animator
- Posts: 469
- Joined: 08 April 2005
by Animator » Mon Jan 09, 2006 9:40 pm
Take a really good look at the number 9. It should leave you to the next number. (Spoiler follows... if you don't want it: stop reading.)
X-Wing with number 9: If you look at the number 9 then you should see that the only possible place for it on row 2 is column 2 and column 4. Now there happens to be another row for which that it is the case (row 6).
This allows you to remove 9 as a candidate from r1c2, r5c2, r1c4.
Now you have your next number. 6 in r1c2.
[Update: this message has been updated to correct the r4c1 typo (as mentioned in the next post).]
X-Wing with number 9: If you look at the number 9 then you should see that the only possible place for it on row 2 is column 2 and column 4. Now there happens to be another row for which that it is the case (row 6).
This allows you to remove 9 as a candidate from r1c2, r5c2, r1c4.
Now you have your next number. 6 in r1c2.
[Update: this message has been updated to correct the r4c1 typo (as mentioned in the next post).]
Last edited by Animator on Mon Jan 09, 2006 6:22 pm, edited 2 times in total.
- Animator
- Posts: 469
- Joined: 08 April 2005
6 posts
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