The next step?

Advanced methods and approaches for solving Sudoku puzzles

The next step?

Postby zebedee » Tue Jun 21, 2005 9:30 pm

I have today managed to solve the very hard puzzle below but only using trial and error. Can anyone advise pse as to whether there is a logical step that I missed from the position shown. I suspect that there is but I couldn't see it for looking.

Many thanks in advance.

Zeb

91* *73 4*6
*76 2** 51*
*** **1 7**

124 *35 6**
8*9 *** 3*1
**7 1** 24*

79* 3** 1**
**3 *17 9**
2*1 *9* 837
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Postby SteveF » Tue Jun 21, 2005 10:02 pm

There is an X-wing which straight away lets you complete a cell.
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Postby zebedee » Tue Jun 21, 2005 10:08 pm

Sorry Steve but can't see it. Can you help a tad more please?

Regards.

Zeb
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Postby SteveF » Tue Jun 21, 2005 10:36 pm

As usual you are looking for two rows or columns in which a number only appears twice.

Have a good look at rows 2 and 6.
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Postby zebedee » Tue Jun 21, 2005 10:40 pm

Steve,

Got it at last. Many thanks.

:D
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Posts: 26
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