Stuck on Hard Pappacom Puzzle logical solution

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Stuck on Hard Pappacom Puzzle logical solution

Postby bergoffen » Fri Nov 03, 2006 8:42 pm

Can someone help me with this one?

I can solve it bridging, but can't find the logical solution.

It is a hard problem and comes from Pappacom's computer program, and will verify



[code]

2349 29 2459 1359 7 1359 8 6 259
7 1 59 68 68 2 3 4 59
239 6 8 359 4 359 15 179 2579

6 3 7 2589 2589 589 15 189 4
249 289 1 35789 589 345789 6 389 3589
5 89 49 13689 689 134689 7 2 389

1 7 29 289 3 89 4 5 6
289 5 3 4 269 679 29 78 1
289 4 6 2579 1 579 29 378 378
[code]

Here is the startiing grid:

. . . . 7 . 8 6 .
7 . . . . 2 3 . .
. 6 8 . 4 . . . .

. 3 7 . . . . . 4
. . 1 . . . 6 . .
5 . . . . . 7 2

. . . . 3 . 4 5 .
. . 3 4 . . . . 1
. 4 6 . 1 . . . .
[/code]

There are no "9s" in the starting grid.

I am looking for the logical next step with an eplanation of the solution strategy
bergoffen
 
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Postby tarek » Fri Nov 03, 2006 9:09 pm

Your next 2 steps would be to look at the intersection of column 5 & box 5 then the double in column 6

tarek
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a splendid puzzle - not quite "superior"

Postby Pat » Mon Nov 13, 2006 11:08 am

bergoffen wrote:
Code: Select all
 . . . | . 7 . | 8 6 .
 7 . . | . . 2 | 3 . .
 . 6 8 | . 4 . | . . .
-------+-------+------
 . 3 7 | . . . | . . 4
 . . 1 | . . . | 6 . .
 5 . . | . . . | 7 2 .
-------+-------+------
 . . . | . 3 . | 4 5 .
 . . 3 | 4 . . | . . 1
 . 4 6 | . 1 . | . . .



a splendid puzzle -- demonstrating how tricky it can get while not quite "superior"
    tarek's definition of a "superior" puzzle:
    needs a trio or an X-wing.
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