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Puzzle NR_067

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Jul 24, 2009 4:16 pm Post subject: Puzzle NR_067

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Jul 25, 2009 4:04 am Post subject:

Code:

.---------------------.---------------------.---------------------.
| 8 9 6 | 14 147 5 | 2 17 3 |
| 7 5 1 | 9 3 2 | 6 4 8 |
| 2 4 3 | 16 167 8 |*15 *157 9 |
:---------------------+---------------------+---------------------:
| 16 8 7 | 12346 146 9 |*15 36 *125 |
| 9 3 4 | 1268 5 16 | 7 68 12 |
| 16 2 5 | 7 168 136 | 9 368 4 |
:---------------------+---------------------+---------------------:
| 3 7 9 | 68 2 46 | 48 *15 *15 |
| 5 6 2 | 138 18 134 | 48 9 7 |
| 4 1 8 | 5 9 7 | 3 2 6 |
'---------------------'---------------------'---------------------'

the deadly BUG lite pattern marked on {1,5} says that neither the 2 in r4c9 or the 7 in r3c8 can both be false.

(1=7)r1c8 - BUGlite(15)[(7)r3c8 = (2)r4c9] - (2=1)r5c9 - (1=6)r5c6 - (6)r46c5 = (6)r3c5 - (6=1)r3c4; r1c45 <> 1

xy-wing {1,6,8} finishes.

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sat Jul 25, 2009 5:52 pm Post subject:

Three steps:

Quote:

xy-wing -168 with pivot 68 in r7c4,
xyz-wing 146 in r4c5 and pseudocell 46 in r13c5,
xy-wing 16-8 with pivot 16 in r5c6.

Ted

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