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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Jan 17, 2009 9:37 pm Post subject: BB for today |
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Today's Brain Bashers super hard is quite nice.
http://www.brainbashers.com/sudoku.asp
| Code: |
+-------+-------+-------+
| . 6 . | 7 . 1 | . 9 . |
| 5 . 9 | . . . | 4 . 7 |
| . 7 . | . 4 . | . 6 . |
+-------+-------+-------+
| 6 . . | 1 . 4 | . . 5 |
| . . 3 | . . . | 6 . . |
| 7 . . | 3 . 5 | . . 2 |
+-------+-------+-------+
| . 4 . | . 1 . | . 5 . |
| 8 . 6 | . . . | 3 . 9 |
| . 3 . | 8 . 6 | . 2 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
It is basically a "Very Hard". I did happen to find a one-step solution.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jan 17, 2009 11:14 pm Post subject: |
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| Quote: | | I did happen to find a one-step solution. |
So did I, but I had two steps before I saw the one-step.
| Quote: | | Two XY-Wings, both on 179, but in different cells, both with pincer transport. Then I saw the W-Wing on 18 |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 18, 2009 12:25 am Post subject: |
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After basics:
| Code: | +----------------+----------------+----------------+
| 234 6 248 | 7 28 1 | 5 9 38 |
| 5 128 9 | 6 3 28 | 4 18 7 |
| 13 7 18 | 5 4 9 | 2 6 138 |
+----------------+----------------+----------------+
| 6 289 28 | 1 278 4 | 79 3 5 |
| 124 5 3 | 29 2789 278 | 6 1478 18 |
| 7 189 148 | 3 6 5 | 19 148 2 |
+----------------+----------------+----------------+
| 29 4 7 | 29 1 3 | 8 5 6 |
| 8 12 6 | 4 5 27 | 3 17 9 |
| 19 3 5 | 8 79 6 | 17 2 4 |
+----------------+----------------+----------------+ |
I like this puzzle because there are a couple of VH possibilities that open up others.
X-wing on <1>.
X-wing on <8>. Correction: Should be on <7>.
I can't find my original coloring. But my one-step elimination is <1> in R5C1. There is a half M-wing <18> that does it. 
Keith
Last edited by keith on Sun Jan 18, 2009 4:12 pm; edited 1 time in total |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Sun Jan 18, 2009 1:56 am Post subject: BB |
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Skyscraper <1>, C39.
Earl |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 18, 2009 5:03 am Post subject: Re: BB |
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| Earl wrote: | Skyscraper <1>, C39.
Earl |
Aha!  |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jan 18, 2009 2:16 pm Post subject: |
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| keith wrote: | After basics:
| Code: | +----------------+----------------+----------------+
| 234 6 248 | 7 28 1 | 5 9 38 |
| 5 128 9 | 6 3 28 | 4 18 7 |
| 13 7 18 | 5 4 9 | 2 6 138 |
+----------------+----------------+----------------+
| 6 289 28 | 1 278 4 | 79 3 5 |
| 124 5 3 | 29 2789 278 | 6 1478 18 |
| 7 189 148 | 3 6 5 | 19 148 2 |
+----------------+----------------+----------------+
| 29 4 7 | 29 1 3 | 8 5 6 |
| 8 12 6 | 4 5 27 | 3 17 9 |
| 19 3 5 | 8 79 6 | 17 2 4 |
+----------------+----------------+----------------+ |
X-wing on <8>
Keith |
I could not locate the X-wing on <8>, but I did spot a Kraken x-wing <8> that deletes <8> from r5c9 as a one-step solution.
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 18, 2009 4:16 pm Post subject: |
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| tlanglet wrote: | | keith wrote: |
X-wing on <8>
Keith |
I could not locate the X-wing on <8>, but I did spot a Kraken x-wing <8> that deletes <8> from r5c9 as a one-step solution.
Ted |
It should be
X-wing on <7>. You can find it in R49.
Keith |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jan 18, 2009 5:48 pm Post subject: |
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| tlanglet wrote: | I could not locate the X-wing on <8>, but I did spot a Kraken x-wing <8> that deletes <8> from r5c9 as a one-step solution.
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Ted: If the X-Wing you found was [c68] for <8>, then you found a finned X-Wing.
| Code: | +-----------------------------------+
| . . 8 | . 8 . | . . 8 |
| . 8 . | . . *8 | . *8 . |
| . . 8 | . . . | . . 8 |
|-----------+-----------+-----------|
| . 8 8 | . 8 . | . . . |
| . . . | . 8 *8 | . *8 -8 | finned X-Wing because
| . 8 8 | . . . | . #8 . | fin cell in same box as elimination
|-----------+-----------+-----------|
| . . . | . . . | 8 . . |
| 8 . . | . . . | . . . |
| . . . | 8 . . | . . . |
+-----------------------------------+
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If the extra candidate cell doesn't share a row/column/box with an elimination cell, then it's a Kraken fin cell and the result is a Kraken fish.
BTW: Nice catch! |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jan 18, 2009 7:02 pm Post subject: |
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Thanks Danny for pointing out the finned X-wing. I had noticed it but assumed that Keith was referring to a regular, every day x-wing.
In any case, the Kraken x-wing <8> is in r13c39 with the external fin in r1c5. If the x-wing is true, then eliminations are in r46c3 and r5c9. If the external fin is true then in box <5>, r45c5 <>8 and r5c6=8. Thus r5c89 <>8 and r6c8=8 which leads to r6c23<>8.
Overall, the Kraken eliminates <8> in r5c9 (which is the same elimination as the finned x-wing)and r6c3 (which is unnecessary to solve the puzzle).
Why use a simple finned x-wing when a harder Kraken x-wing will do the same job?
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Jan 18, 2009 7:21 pm Post subject: |
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| tlanglet wrote: | Why use a simple finned x-wing when a harder Kraken x-wing will do the same job?
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My sentiments exactly.  ..... Nice Kraken fish!!! |
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