Previously Solved...but now I'm stuck!

Advanced methods and approaches for solving Sudoku puzzles

Postby Anette » Tue Sep 13, 2005 7:42 pm

This one was really difficult.

But after following tso's advice, look at the 1's. If you look at columns 3,4,6 and 7, you can see that they have candidate 1 only for rows 1,3,6 and 9.

This allows you to eliminate 1's in rows 1,3,6 and 9 for all other columns. After having made that elimination, you can place a 1. From there you can continue.

There is a similar pattern in 5's, columns 2,8 and 9. But that one only gets you one step ahead.
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Postby tso » Tue Sep 13, 2005 8:16 pm

I corrected my typo in my original post -- sorry about that. However, after following all the clues upto and including the x-wing, there is nothing but hidden and naked singles.

-- Only one place for a "1" in box 4,
-- Row 9 column 1 can has only one possibility, etc.
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Postby pch » Wed Sep 14, 2005 8:58 am

Thanks, tso - following your advice, I did complete the puzzle on Monday but my userid had disappeared and I have had to re-register.
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Postby Anette » Wed Sep 14, 2005 8:11 pm

I missed eliminating one candidate based on the X-wing - no wonder it was difficult. Thanks tso for pointing that out!

Sorry for the confusing advice!

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