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August 3 VH

 
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sun Aug 03, 2008 9:58 am    Post subject: August 3 VH Reply with quote

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 Very Happy
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sdq_pete



Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL

PostPosted: Sun Aug 03, 2008 3:34 pm    Post subject: Reply with quote

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

PostPosted: Sun Aug 03, 2008 3:39 pm    Post subject: Reply with quote

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

PostPosted: Sun Aug 03, 2008 3:45 pm    Post subject: Reply with quote

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

PostPosted: Sun Aug 03, 2008 5:34 pm    Post subject: Reply with quote

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

PostPosted: Sun Aug 03, 2008 6:14 pm    Post subject: Reply with quote

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

PostPosted: Sun Aug 03, 2008 10:25 pm    Post subject: Reply with quote

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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