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daj95376
Joined: 23 Aug 2008 Posts: 3854
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Posted: Wed Nov 26, 2008 6:47 am Post subject: VH (+): Set C Puzzle 9 |
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Code: | +-----------------------+
| 6 . . | . 3 . | . 2 9 |
| . 3 . | . . . | . . . |
| . . 2 | . . 9 | . . 7 |
|-------+-------+-------|
| . . . | . . . | . . . |
| 7 . . | . 4 6 | . 9 2 |
| . . 6 | . 2 . | 8 . 4 |
|-------+-------+-------|
| . . . | . . 4 | 1 . 3 |
| 2 . . | . 5 . | . . . |
| 4 . 1 | . 7 3 | 2 . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Wed Nov 26, 2008 10:20 pm Post subject: |
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I used four techniques and got stuck. A Medusa wrap opened things up enough for four or five more moves, with an M-Wing finishing it off.
The M-Wings on 59 were part of an "almost" Type 6 UR on the same pair. I didn't know if there was something to do based on the combination, so I used an M-Wing, made two moves based on the hidden UR and used the second M-Wing to finish.
Based on the fact that you called this a VH+, I think I must've missed something. |
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nataraj
Joined: 03 Aug 2007 Posts: 1048 Location: near Vienna, Austria
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Posted: Wed Nov 26, 2008 10:35 pm Post subject: |
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I found a very useful x-wing (1) rows 1,5 right away.
(I then jumped at a gm-wing, but later realized, that I had not yet exhausted the usual VH arsenal)
An xy-wing ( 8 ) r5c3=r9c2 ( 85-59-98 ); r7c3,r5c2<>8
And another xy-wing ( 1 ) r6c8=r5c2 ( 13-35-51 ); r6c1<>1
did the job with common vh tools... |
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tlanglet
Joined: 17 Oct 2007 Posts: 2468 Location: Northern California Foothills
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Posted: Thu Nov 27, 2008 2:17 am Post subject: |
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After reading the comments already posted, I think I was somewhere between Marty and Nataraj. I started off with the x-wing on <1>, then spotted a Kraken x-wing on <1> (but I later realized that the same elimination could have been made by either a ER in box3 or a kite in box 6). Next, I found a xy-wing on <589> and then on <135>. Following another x-wing on <8>, a UR on <45> did the deed for me.
This puzzle and the "Set C Puzzle #" puzzle both required six VH steps, but I worked harder to solve this one even though it had a slightly lower rating. Of course, I could have missed a killer step for either puzzle.
Ted |
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daj95376
Joined: 23 Aug 2008 Posts: 3854
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Posted: Thu Nov 27, 2008 3:37 am Post subject: |
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I base puzzle ratings on the difficulty of the techniques used by my solver, and try to factor in the number of techniques present.
Code: | r15 X-Wing <> 1 [r36c2],[r2346c4]
Colors <> 1 [r2c1] Kite
XY-Wing [r6c2]/[r5c3]+[r9c2] <> 8 [r5c2],[r7c3]
Multiple Colors <> 8 [r1c3] Kite
XY-Wing [r5c7]/[r5c2]+[r6c8] <> 1 [r6c1]
r1 Naked Pair <> 57 [r1c247]
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From now on, I'll post unrated puzzles and let you decide their difficulty. Actually, I was planning to do this anyway, and your comments indicate that I'd made the right decision. |
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