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Question on 22-Jul-2005 sudoku

 
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PostPosted: Fri Jul 22, 2005 1:28 am    Post subject: Question on 22-Jul-2005 sudoku Reply with quote

I'm stuck and need help on the next logical move.

Code:

--- 319 -7-
9-- -2- -61
7-1 --6 3--
4-- 2-- ---
189 465 237
--- --1 -48
-76 --- 4-5
89- -7- ---
-1- 6-2 7--


Thanks.
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Guest






PostPosted: Fri Jul 22, 2005 10:10 am    Post subject: Reply with quote

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






PostPosted: Fri Jul 22, 2005 11:58 am    Post subject: Re: Question on 22-Jul-2005 sudoku Reply with quote

I'm stuck at the exacly same place.

Code:

--- 319 -7-
9-- -2- -61
7-1 --6 3--
4-- 2-- -#-
189 465 237
--- --1 -48
-76 --- 4-5
89- -7- ---
-1- 6-2 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






PostPosted: Fri Jul 22, 2005 12:26 pm    Post subject: Re: Question on 22-Jul-2005 sudoku Reply with quote

A LOT of brainstorming, and I came up with this:

Code:

--- 319 #7*
9-- -2- #61
7-1 --6 3%
4-- 2-- -^-
189 465 237
--- --1 -48
-76 --- 4-5
89- -7- ---
-1- 6-2 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






PostPosted: Fri Jul 22, 2005 2:05 pm    Post subject: Reply with quote

I was also stuck at the same exact place... good logic to get the 5! Kudos!
~kjk
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PostPosted: Fri Jul 22, 2005 8:33 pm    Post subject: Reply with quote

Code:

--- 319 -7-
9-- -2- -61
7-1 --6 3c-
4-- 2-- --a
189 465 237
--- --1 b48
-76 --- 4-5
89- -7- d--
-1- 6-2 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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PostPosted: Fri Jul 22, 2005 8:35 pm    Post subject: Reply with quote

My mistake, I wrote the code wrong in my above post...
Code:

--- 319 -7-
9-- -2- -61
7-1 --6 3c-
4-- 2-- 15a
189 465 237
--- --1 b48
-76 --- 4-5
89- -7- d--
-1- 6-2 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






PostPosted: Mon Jul 25, 2005 8:06 am    Post subject: Re: Question on 22-Jul-2005 sudoku Reply with quote

Anonymous wrote:
A LOT of brainstorming, and I came up with this:

Code:

--- 319 #7*
9-- -2- #61
7-1 --6 3%
4-- 2-- -^-
189 465 237
--- --1 -48
-76 --- 4-5
89- -7- ---
-1- 6-2 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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PostPosted: Mon Jul 25, 2005 9:16 pm    Post subject: Reply with quote

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. Very Happy
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