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tlanglet
Joined: 17 Oct 2007 Posts: 2468 Location: Northern California Foothills
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Posted: Sun Aug 03, 2008 9:58 am Post subject: August 3 VH |
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For me, this was a puzzle that involved 5 steps after basics, although I suspect one or more of the moves were not required.
Hints:
A kite on <3> in box 7
A kite on <7> in box 1
A Type 4 UR on <57> in r49c89 with a strong link on <5> in row 4
An xy-wing on <126> with pivot at r6c7
An xyz-wing on <347> with pivot at r1c3
It was a very fun puzzle that did not fall apart after a single move ........
Ted |
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sdq_pete
Joined: 30 Apr 2007 Posts: 119 Location: Rotterdam, NL
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Posted: Sun Aug 03, 2008 3:34 pm Post subject: |
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A single XYZ with pivot in Block 1 unlocked the whole thing for me.
Peter |
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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Sun Aug 03, 2008 3:39 pm Post subject: |
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I used Ted's last two steps and based on Pete, maybe the XY-Wing wasn't needed.
I think different solutions, not just to this puzzle, are at least partially due to the sequence in which we look for potential moves. |
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Wendy W
Joined: 04 Feb 2008 Posts: 144
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Posted: Sun Aug 03, 2008 3:45 pm Post subject: |
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Exactly the same for me, Pete. After that one xyz it was just a matter of time. After a long spell of really tough VH puzzles (for me at least!), the past few weeks' VHs have been easy. |
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nataraj
Joined: 03 Aug 2007 Posts: 1048 Location: near Vienna, Austria
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Posted: Sun Aug 03, 2008 5:34 pm Post subject: |
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I think I took a route very similar to Ted's: I remember the kite and other coloring, the UR, ...
In the end it was that last xyz-wing that solved the puzzle and now that I look at the puzzle again, that xyz-wing had been there right after basics - it is really a one-step solution if one happens to see it early. |
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crunched
Joined: 05 Feb 2008 Posts: 168
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Posted: Sun Aug 03, 2008 6:14 pm Post subject: |
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Well...the xyz did it for me too. I did not see it early. I saw it after a long time, which is typical for me. XYZs are not easy to spot for me.
This was a V hard puzzle for me indeed.
nataraj wrote: | I think I took a route very similar to Ted's: I remember the kite and other coloring, the UR, ...
In the end it was that last xyz-wing that solved the puzzle and now that I look at the puzzle again, that xyz-wing had been there right after basics - it is really a one-step solution if one happens to see it early. |
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Johan
Joined: 25 Jun 2007 Posts: 206 Location: Bornem Belgium
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Posted: Sun Aug 03, 2008 10:25 pm Post subject: |
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I used the strong link on <6> for solving this one.
Some of the strong links in a grid can be very useful for finding a solution, especially when the strong link is surrounded with bi-value cells that contain
the strong linked digit. Now if we take a closer look at the strong link* on <6> in R3, we know that either R3C2=6 or R3C5=6, which eliminates <7> in R8C2.
R3C2=|6| => R4C2=|7| (a)
R3C5={6} => R2C5={4} => R8C5={7} (b)
Code: | +-------------------------+-------------------------+-------------------------+
| 47 357 347 | 2345 8 123 | 17 9 6 |
| 8 9 3467 | 34 {4}6 136 | 5 27 12 |
| 2 * 5|6| 1 | 9 * 5{6} 7 | 8 3 4 |
+-------------------------+-------------------------+-------------------------+
| 3 a 6|7| 4679 | 1 2 8 | 4679 4567 57 |
| 47 18 2479 | 6 3 5 | 1479 2478 12 |
| 5 18 26 | 7 9 4 | 16 268 3 |
+-------------------------+-------------------------+-------------------------+
| 1 4 37 | 8 567 36 | 2 56 9 |
| 9 3-7 5 | 234 b 46{7} 236 | 346 1 8 |
| 6 2 8 | 345 1 9 | 347 457 57 |
+-------------------------+-------------------------+-------------------------+ |
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