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Puzzle VH_015

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon May 11, 2009 4:06 pm Post subject: Puzzle VH_015

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue May 12, 2009 3:45 am Post subject:

Quote:

5 xy-wings and 2 x-wings

I know, I know, its a VH,
but I couldn't resist...

Code:

.---------------------.---------------------.---------------------.
| 4 1 2 | 5 8 *37 | 9 6 *37 |
| 9 7 8 | 6 *24 *34 | 235 235 1 |
| 3 6 5 |*279 279 1 |*27 4 8 |
:---------------------+---------------------+---------------------:
| 6 2 19 | 8 4579 4579 | 1347 1379 3479 |
| 5 48 19 | 479 3 6 | 12478 1279 479 |
| 7 48 3 | 49 1 2 | 458 59 6 |
:---------------------+---------------------+---------------------:
| 2 39 7 | 1 459 459 | 6 8 3459 |
| 8 39 6 |*23479 24579 4579 | 1347 1379 34579 |
| 1 5 4 |*379 6 8 |*37 379 2 |
'---------------------'---------------------'---------------------'

the loop marked above which is triggered by the useless w-wing {3,7}
(3=7)r1c6 - (7)r1c9 = (7)r3c7 - (7=3)r9c7 - (3)r9c4 = (3-2)r8c4 = (2)r3c4 - (2=4)r2c5 - (3=4)r2c6
does some damge:
4,7,9 from r8c4
3 from r9c8
7 from r458c7
2 from r3c5
leaves...

Code:

.---------------------.---------------------.---------------------.
| 4 1 2 | 5 8 37 | 9 6 37 |
| 9 7 8 | 6 24 34 | 235 235 1 |
| 3 6 5 | 279 79 1 | 27 4 8 |
:---------------------+---------------------+---------------------:
| 6 2 19 | 8 579 579 | 134 1379 3479 |
| 5 48 19 | 479 3 6 | 128 1279 79 |
| 7 48 3 | 49 1 2 | 58 59 6 |
:---------------------+---------------------+---------------------:
| 2 39 7 | 1 459 459 | 6 8 3459 |
| 8 39 6 | 23 24579 4579 | 134 1379 34579 |
| 1 5 4 | 379 6 8 | 37 79 2 |
'---------------------'---------------------'---------------------'

x-wing 9
xy-wing 479
xy-wing 123

still 4 steps

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