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Guest

Posted: Fri Jul 22, 2005 1:28 am Post subject: Question on 22Jul2005 sudoku 


I'm stuck and need help on the next logical move.
Code: 
 319 7
9 2 61
71 6 3
4 2 
189 465 237
 1 48
76  45
89 7 
1 62 7

Thanks. 

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Guest

Posted: Fri Jul 22, 2005 10:10 am Post subject: 


6 2 8 3 1 9 5 7 4
9 4 3 5 2 7 8 6 1
7 5 1 8 4 6 3 9 2
4 3 7 2 9 8 1 5 6
1 8 9 4 6 5 2 3 7
5 6 2 7 3 1 9 4 8
2 7 6 9 8 3 4 1 5
8 9 5 1 7 4 6 2 3
3 1 4 6 5 2 7 8 9 

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Guest

Posted: Fri Jul 22, 2005 11:58 am Post subject: Re: Question on 22Jul2005 sudoku 


I'm stuck at the exacly same place.
Code: 
 319 7
9 2 61
71 6 3
4 2 #
189 465 237
 1 48
76  45
89 7 
1 62 7

The sudoko drawer suggest 5 where the # is, but i just can't see the logic move with this. 

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Guest

Posted: Fri Jul 22, 2005 12:26 pm Post subject: Re: Question on 22Jul2005 sudoku 


A LOT of brainstorming, and I came up with this:
Code: 
 319 #7*
9 2 #61
71 6 3¤%
4 2 ^
189 465 237
 1 48
76  45
89 7 
1 62 7

For positions #: 5,8 are the only options
For position ¤: the options are 2,5,8,9
For position *: the only valid numbers are 2,4
For position %: the options are 2,4,9
That leaves us with 3 possible locations for the number 5.
The numbers 2, 4 and 9 must occupy positions ¤, % and * since that is the only valid space for those three numbers.
Which leaves us with the numbers 5 & 8, which must go into positions #.
This means that the number 5 already oocupies column seven and nine, which only leaves us with option ^ to place the number 5 in.
PHEV! That was a tough one. Did i do it correct? Or is there any easier way to do this? 

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Guest

Posted: Fri Jul 22, 2005 2:05 pm Post subject: 


I was also stuck at the same exact place... good logic to get the 5! Kudos!
~kjk 

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Guest

Posted: Fri Jul 22, 2005 8:33 pm Post subject: 


Code: 
 319 7
9 2 61
71 6 3c
4 2 a
189 465 237
 1 b48
76  45
89 7 d
1 62 7 
Regarding the spots a and b, where you must decide where the 6 and 9 must go. If we place a 9 in slot a, then the only spot we can place the 9 in the top right box must be in slot c. Consequently, a 9 must be placed in slot d, which is the last valid spot to place a 9 in that column. But there is already a 9 in that row, so therefore a 9 cannot go in slot a. A 6 must go in slot A and a 9 must go in the remaining slot. Hope this helps. 

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Guest

Posted: Fri Jul 22, 2005 8:35 pm Post subject: 


My mistake, I wrote the code wrong in my above post...
Code: 
 319 7
9 2 61
71 6 3c
4 2 15a
189 465 237
 1 b48
76  45
89 7 d
1 62 7 
The 5 that is left of slot A is explained in the above posts, and the 1 that is beside the aforementioned 5 can be easily deduced after that 5 is placed. This should make things clearer. 

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Guest

Posted: Mon Jul 25, 2005 8:06 am Post subject: Re: Question on 22Jul2005 sudoku 


Anonymous wrote:  A LOT of brainstorming, and I came up with this:
Code: 
 319 #7*
9 2 #61
71 6 3¤%
4 2 ^
189 465 237
 1 48
76  45
89 7 
1 62 7

For positions #: 5,8 are the only options
For position ¤: the options are 2,5,8,9
For position *: the only valid numbers are 2,4
For position %: the options are 2,4,9
That leaves us with 3 possible locations for the number 5.
The numbers 2, 4 and 9 must occupy positions ¤, % and * since that is the only valid space for those three numbers.
Which leaves us with the numbers 5 & 8, which must go into positions #.
This means that the number 5 already oocupies column seven and nine, which only leaves us with option ^ to place the number 5 in.
PHEV! That was a tough one. Did i do it correct? Or is there any easier way to do this? 
The fact that only 5 and 8 can go into the positions # already tells you that the 5 has to go into position ^ since they block placing the number 5 in the eight column's three top positions and the bottom three positions of the same colums are blocked by the 5 in that "big square". That only leaves position 4 for the number 5 in column 8. Was that less tough? /Y 

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Guest

Posted: Mon Jul 25, 2005 9:16 pm Post subject: 


Just to say this was obviously a tricky one as we are all stuck in the same place but thanks Anonymous, your deduction for the 5 is spot on. With the help of that 5 which I didn't at the time see the logic of, I solved the puzzle after a decent amount of further brainstorming which led me to solve the central block of 9, everything else then came quite easily.
Thanks for the help. 

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