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X-treme Nov 27 - ideas?

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sudokuEd
Grandmaster

Joined: 19 Jun 2006
Posts: 257
Location: Sydney Australia

Posted: Mon Nov 27, 2006 11:41 am Post subject: X-treme Nov 27 - ideas?

Been staring blankly at this spot for ages - can't find anything. Any ideas? Surely that infestation has been exterminated by now?

Code:

.------------------.------------------.------------------.
| 167 346 13467| 4679 8 2 | 5 134 69 |
| 5 8 13467| 4679 3469 34679| 2 134 1469 |
| 2 9 346 | 5 346 1 | 7 8 46 |
:------------------+------------------+------------------:
| 169 2 1689 | 4679 14679 4689 | 1468 5 3 |
| 3 7 168 | 146 5 468 | 146 9 2 |
| 4 5 1689 | 136 2 369 | 168 7 18 |
:------------------+------------------+------------------:
| 79 1 2 | 8 349 3479 | 39 6 5 |
| 6789 346 5 | 13679 169 3679 | 1389 2 1478 |
| 689 346 34679| 2 1679 5 | 1389 14 147 |
'------------------'------------------'------------------'

Ruud
Site Owner

Joined: 30 Dec 2005
Posts: 601

Posted: Mon Nov 27, 2006 1:51 pm Post subject:

There is a very simple coloring move to eliminate 3 from r8c2:

Code:

.------------------.------------------.------------------.
| 167 346 13467| 4679 8 2 | 5 134 69 |
| 5 8 13467| 4679 3469 34679| 2 134 1469 |
| 2 9 346 | 5 346 1 | 7 8 46 |
:------------------+------------------+------------------:
| 169 2 1689 | 4679 14679 4689 | 1468 5 3 |
| 3 7 168 | 146 5 468 | 146 9 2 |
| 4 5 1689 |A136 2 369 | 168 7 18 |
:------------------+------------------+------------------:
| 79 1 2 | 8 349 3479 | 39 6 5 |
| 6789 -346 5 |B13679 169 3679 | 1389 2 1478 |
| 689 346 34679| 2 1679 5 | 1389 14 147 |
'------------------'------------------'------------------'

The subsequent Locked_Candidates move will open things up a little.

Ruud

sudokuEd
Grandmaster

Joined: 19 Jun 2006
Posts: 257
Location: Sydney Australia

Posted: Tue Nov 28, 2006 6:15 am Post subject:

Ruud wrote:

There is a very simple coloring move to eliminate 3 from r8c2:

It was simple - tricked by those diagonals again. Very Happy

The rest flowed out very nicely, with one more hold-up at the end. Thanks.

I like how you put the links to the relevant bit in Supopedia too. Very helpful.

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