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VH+UR by Tarek

 
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Mon Apr 28, 2008 10:29 am    Post subject: VH+UR by Tarek Reply with quote
Code:
 +-------+-------+-------+
 | . . . | . 8 . | . . . |
 | . . . | 3 6 1 | . . . |
 | . . 3 | . . . | 4 . . |
 +-------+-------+-------+
 | . 4 . | . . . | . 1 . |
 | 8 5 . | . . . | . 6 7 |
 | . 2 . | . . . | . 8 . |
 +-------+-------+-------+
 | . . 1 | . . . | 7 . . |
 | . . . | 8 5 2 | . . . |
 | . . . | . 9 . | . . . |
 +-------+-------+-------+
>>> play online
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Apr 28, 2008 4:21 pm    Post subject: Reply with quote
After basics, I had several steps to solve this one.
1. x-wing on <8>
2. Type 1 UR on <45>
3.A Type 3 UR on <36>
4. xyz-wing on <589>
5. xy-wing on <259>, and finally
6. Another Type 3 UR on the same <36> as noted above.

Also seemed to have a lot of naked sets, etc between major moves.

Ted
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Fri May 02, 2008 9:25 am    Post subject: Reply with quote
Code:
.---------------------.---------------------.---------------------.
| 259   #17     25    | 4      8      59    | 16    #37     136   |
| 4      789   #58    | 3      6      1     | 2589   2579   2589  | <-5's gone
| 6     #18     3     | 7      2      59    | 4     #59     18    |
:---------------------+---------------------+---------------------:
| 3      4      6     | 59     7      8     | 259    1      259   |
| 8      5      9     | 2      1      4     | 3      6      7     |
| 1      2      7     | 59     3      6     | 59     8      4     |
:---------------------+---------------------+---------------------:
| 259    89     1     | 6      4      3     | 7      25     258   |
| 7      36     4     | 8      5      2     | 169   #39     1369  |
| 25     36     258   | 1      9      7     | 2568   4      23568 |
'---------------------'---------------------'---------------------'


the xy-chain marked above starting in r3c8 and ending in r2c3, eliminate all 5's in r2 of box3.

and solves it
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