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Puzzle NR_063

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Jul 20, 2009 2:14 pm Post subject: Puzzle NR_063

XYZ-Wing alert -or- unusual UR elimination (for me)

Code:

+-----------------------+
| . . 4 | . 8 . | . 5 9 |
| . 2 5 | 4 7 . | 8 1 . |
| 8 7 . | 5 . . | . 6 . |
|-------+-------+-------|
| . 6 9 | . . . | . . . |
| 5 8 . | . 6 . | . . . |
| . . . | . . 8 | . 7 . |
|-------+-------+-------|
| . 5 . | . . . | . . 1 |
| 3 1 6 | . . 4 | . 8 . |
| 4 . . | . . . | 5 . . |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Jul 20, 2009 5:59 pm Post subject:

Code:

.---------------------.---------------------.---------------------.
| 6 3 4 | 12 8 12 | 7 5 9 |
| 9 2 5 | 4 7 6 | 8 1 3 |
| 8 7 1 | 5 39 39 | 24 6 24 |
:---------------------+---------------------+---------------------:
| 127 6 9 | 1237 4 5 | 123 23 8 |
| 5 8 237 | 1237 6 12 | 12349 49 24 |
| 12 4 23 | 1239 29 8 | 6 7 5 |
:---------------------+---------------------+---------------------:
| 27 5 8 | 6 239 379 | 2349 49 1 |
| 3 1 6 | 29 5 4 | 29 8 7 |
| 4 9 27 | 8 1 37 | 5 23 6 |
'---------------------'---------------------'---------------------'

ER 2 removes 2 from r6c3
some singles leaves r4c4 as a bi-value {3,7} which can be used in an extended w-wing

extended w-wing {3,7}
(7=3)r4c4 - (3)r4c8 = (3)r9c8 - (3=7)r9c6 - (7)r9c3 = (7)r5c3; r5c4 <> 7

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