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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Tue Jun 17, 2008 12:37 pm Post subject: VH+ by JPF (game 0039) |
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| Code: | +-------+-------+-------+
| . 1 . | 2 . . | . 3 . |
| 4 . . | . 5 . | . . 6 |
| . . . | . . 7 | . . . |
+-------+-------+-------+
| 2 . . | . 8 . | 6 . . |
| . 4 . | 5 . 3 | . 2 . |
| . . 5 | . 7 . | . . 4 |
+-------+-------+-------+
| . . . | 6 . . | . . . |
| 9 . . | . 2 . | . . 5 |
| . 2 . | . . 1 | . 4 . |
+-------+-------+-------+ JPF
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>>> play online
A long puzzle. I needed a lot of advanced techniques, the hardest being coloring with 3 strong links and a w-wing connected by a kite. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Tue Jun 17, 2008 1:28 pm Post subject: |
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It sure was a loooooooong puzzle!
spoiler alert! This is the list of steps I used (and I cannot believe that all of them were really necessary):
a) trying to reduce those cells with many candidates still after basics, I looked at coloring:
coloring on 3 and x-wing on 9
After cleanup, an x-wing on 1 and a skyscraper (3)
b) An xy-wing 78-18-17 in the upper left (I don't remember but I think it was boxes 1 and 4), then
c) that coloring ( on 8 ) with the many links involved. I guess this is the one ravel was talking about ...
d) an xyz-wing (actually TWO xyz-wings) pivoted on 7,8,9 in r9c9
e) a regular w-wing (<79> in r5c7 and r7c8, conncted via strong link on 7 in row 2)
f) finally, an xy-wing (actually two connected xy-wings) 89-19-18 (or 19-18-89) |
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