Baffled with this puzzle

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Re: Baffled with this puzzle

Postby RW » Thu Jan 24, 2008 6:34 am

bingham wrote:Oh dear, I try to work only from logic, and XY-wing doesn't explain it!
What is wrong with the assignments r5c1,3,4,6,9 = 4,9,5,3,6 and
r4c8 o9 = 9?:(

If r5c1=4 and r5c3=9, what do you put in r4c2?

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Baffled with this puzzle

Postby bingham » Fri Jan 25, 2008 1:34 am

Thank you RW. I was either blind or stupid (frequently both!)
So, if we now set r4c2, r5c9, and r7c8=9 we can fill in the bottom row.
BUT that's as far as I can go!
More help?
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Postby RW » Fri Jan 25, 2008 5:41 am

Ah, I suspect you are stuck here:
Code: Select all
 *-----------------------------------------------------------*
 | 3     156   7     | 159   1459  48    | 689   56    2     |
 | 168   2     1569  | 1359  159   38    | 689   4     7     |
 | 48    45    459   | 7     2     6     | 389   35    1     |
 |-------------------+-------------------+-------------------|
 | 47    9     2     | 6     48    1     | 5     37    38    |
 | 46    8     456   | 35    7     34    | 1     2     9     |
 | 17    15    3     | 2     58    9     | 4     67    68    |
 |-------------------+-------------------+-------------------|
 | 5     146   146   | 8     3     7     | 2     9     46    |
 | 2     7     46    | 19    19    5     | 36    8     346   |
 | 9     3     8     | 4     6     2     | 7     1     5     |
 *-----------------------------------------------------------*

Remember that I started solving from Jasper's pm-grid, in that grid the '4' in r1c5 is eliminated (but no explanation to why). Without that elimination the puzzle seems to require some more forcing chains... Gotta run now, might have a look at it when I get back home in the evening.

RW
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