Trouble with this Puzzel

Advanced methods and approaches for solving Sudoku puzzles

Trouble with this Puzzel

Postby jwestern » Sat Mar 11, 2006 1:39 am

I am having trouble with this puzzel. Please advise on solution steps. The solution is correct up to this point but could not move forward.

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

Thank you..... Jeff:?:
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Postby tarek » Sat Mar 11, 2006 2:04 am

hi there Jeff,

Some advancedc techniques needed,

The easiest probably is simple colouring of 8s, which will solve the puzzle.

I also like the finned x-wing (also in 8s) which would solve the puzzle also...

Tarek
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Re: Trouble with this Puzzel

Postby aeb » Sat Mar 11, 2006 2:11 am

jwestern wrote:I am having trouble with this puzzel. Please advise on solution steps. The solution is correct up to this point but could not move forward.
Code: Select all
3 6 - |A- 7 1 | 2E- 5
8 7 - | 5 2 6 | 1 3 -
1 2 5 | 3 4B- | - 6 -
------+-------+------
4 9 7 | 6 3 2 | 5 1 8
5 1 6 | - 8 - | - 2 3
2 8 3 | 1 5 - | 6 9 -
------+-------+------
7 4 8 | 2 1 3 | 9 5 6
9 3 2 | - 6 5 | - 7 1
6 5 1 | - 9C- | 3D- 2

Thank you..... Jeff:?:

You can use the technique known as 'hinge' or 'Empty Rectangle'.
If there is an 8 at C then not at D and hence at E. But digits 8 at both C and E would leave the middle top box without place for an 8. Therefore there is no 8 at C. The rest is easy.
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Postby emm » Sat Mar 11, 2006 2:23 am

This puzzle was posted in a different section earlier today. Click 'always stuck in the same place' for some other answers.
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Thanks!

Postby jwestern » Sat Mar 11, 2006 7:04 am

Thanks to all. I learned from all.:D

Jeff
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