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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Wed Sep 02, 2009 4:43 pm    Post subject: From the archives Reply with quote
This one is better than most. 11 August, 2008.
Code:

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

Play this puzzle online at the Daily Sudoku site

Keith
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Wed Sep 02, 2009 7:18 pm    Post subject: Reply with quote
A two-step for me - x-wing on 5 and a 258 xy-wing
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Wed Sep 02, 2009 7:34 pm    Post subject: Reply with quote
Quote:
A two-step for me - x-wing on 5 and a 258 xy-wing

That's how I solved it. It took me a while to see the X-wing.

Looking further, after basics (except for a hidden pair in R9):
Code:
+----------------+----------------+----------------+
| 39   4    2389 | 123  123  6    | 18   7    5    |
| 35   258  2358 | 7    123  9    | 18   4    6    |
| 6    7    1    | 4    5    8    | 3    2    9    |
+----------------+----------------+----------------+
| 1    58#  568  | 258# 4   2-57  | 267  9    3    |
| 2    9    48   | 38   6    37   | 47   5    1    |
| 7    3    456  | 25#  9    1    | 246  8    24   |
+----------------+----------------+----------------+
| 34   1    7    | 9    238  23   | 5    6    248  |
| 8    6    259  | 125  127  4    | 29   3    27   |
| 3459 25   2359 | 6    2378 235  | 249  1    2478 |
+----------------+----------------+----------------+
The XYZ-wing 2-58 solves it in one step. Smile

Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Sep 05, 2009 2:53 pm    Post subject: Reply with quote
It took me three xy-wings with extensions or pseudocell to do the job. It was a longer but fun excursion.........

Ted
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