An impossible puzzle (for me)

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An impossible puzzle (for me)

Postby GoSimon » Sun Feb 24, 2008 11:54 pm

Need help in solving this one. Thanks in advance!

Code: Select all
 . . . | . 8 . | . 2 .
 6 . . | 4 . . | 7 . .
 . 4 1 | 3 . . | 8 . .
-------+-------+-------
 . . . | . . . | 9 6 .
 9 . . | . 7 . | . . 3
 . 8 2 | . . . | . . .
-------+-------+-------
 . . 9 | . . 1 | 3 8 .
 . . 7 | . . 6 | . . 5
 . 5 . | . 9 . | . . .
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Postby daj95376 » Mon Feb 25, 2008 12:57 am

Posting the original puzzle alone isn't a good idea when asking for help. Too many students try to get the forums to do their homework for them. I need to know specifically where you encountered problems. A pencilmark (PM) grid is the best way to convey this information.
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Postby ncantoral » Mon Feb 25, 2008 4:25 am

should be all singles from what I can see
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Joined: 18 October 2007

Postby eleven » Mon Feb 25, 2008 11:21 am

Code: Select all
 . . . | # 8 . | . 2 .
 6 . 8 | 4 . . | 7 3 .
 . 4 1 | 3 . . | 8 5 .
-------+-------+-------
 . . . | . . . |*9*6 8
*9 * * | . 7 . | 2 . 3
 . 8 2 | # . . | 5 . .
-------+-------+-------
 . . 9 | . . 1 | 3 8 .
 . . 7 | . .*6 | . 9 5
 . 5 . | .*9 . | . . .

No single here. Not easy.

In row 5 the 6 must be in box 4 (r5c23). So in column 4 69 only possible in r16c4. Where is 1 in box 2 then ?
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Postby Carcul » Mon Feb 25, 2008 11:49 am

Look for a naked/hidden quad.
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Postby eleven » Mon Feb 25, 2008 1:00 pm

Can only find a hidden triple (146)/naked quad, which solves the puzzle as well.
Code: Select all
 . . . | # 8 . | # 2 #
*6 . 8 |*4 . . | 7 3 .
 .*4*1 | 3 . . | 8 5 .
-------+-------+-------
 . . . | . . . | 9 6 8
 9 . . | . 7 . | 2 . 3
 . 8 2 | . . . | 5 . .
-------+-------+-------
 . . 9 | . .*1 | 3 8 .
 . . 7 | . .*6 | . 9 5
 . 5 . | . 9 . | . . .
eleven
 
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Postby ncantoral » Mon Feb 25, 2008 5:04 pm

oops, I must have gotten lucky
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Joined: 18 October 2007


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