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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Mon Nov 19, 2007 2:53 pm Post subject: While waiting for the next Very Hard ... |
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This is a random Super Hard from Brain Bashers. Needs a little more than this site's Very Hards.
| Code: | . 4 . | . 8 . | . 1 .
3 . . | 1 6 7 | . . 9
. . . | 5 . 4 | . . .
-------+-------+------
. 9 8 | . . . | 4 6 .
4 7 . | . . . | . 2 8
. 2 3 | . . . | 9 7 .
-------+-------+------
. . . | 8 . 5 | . . .
8 . . | 9 4 6 | . . 7
. 5 . | . 1 . | . 3 . |
Keith |
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re'born
Joined: 28 Oct 2007
Posts: 80
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| Posted: Mon Nov 19, 2007 4:46 pm Post subject: |
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After basics, an empty rectangle in box 9 will eliminate 6 from r3c9 solving the puzzle.
P.S. Don't tell my wife I was here. I was supposed to give up posting today, but she doesn't know about this site.  |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Nov 19, 2007 6:39 pm Post subject: |
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me I'm more into coloring it seems,
an x-wing in 2 (r1c7, r7c7)
one in 5 (r1c7)
and a short chain in 6 (r3c9): -r3c2=r1c3-r9c3=r9c9-
all at the same position:
| Code: |
+--------------------------+--------------------------+--------------------------+
| 25 4 67 | 3 8 9 | 2567 1 256 |
| 3 8 25 | 1 6 7 | 25 4 9 |
| 17 16 9 | 5 2 4 | 367 8 36 |
+--------------------------+--------------------------+--------------------------+
| 15 9 8 | 2 7 13 | 4 6 35 |
| 4 7 15 | 6 9 13 | 35 2 8 |
| 6 2 3 | 4 5 8 | 9 7 1 |
+--------------------------+--------------------------+--------------------------+
| 127 16 467 | 8 3 5 | 126 9 246 |
| 8 3 12 | 9 4 6 | 12 5 7 |
| 9 5 46 | 7 1 2 | 8 3 46 |
+--------------------------+--------------------------+--------------------------+ |
Empty rectangles come after that (when I've drawn the diagrams already), but no need for that any more (after the eliminations above, the rest were singles).
P.S. Thanks Keith, for posting a sudoku. Those days without vh, what a drag!
--------
edit: oops, I just realized my chain in 6 duplicates the effect of re'born's ER
edit #2: @re'born: don't feel guilty, here's what to do: http://www.youtube.com/watch?v=omFqlr_kso0 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Nov 19, 2007 8:24 pm Post subject: |
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| shame shame re'born, but everyone needs a hobby to stay sane |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Nov 19, 2007 9:29 pm Post subject: |
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There is a <46> UR that takes out a couple if <6>'s in R7. Then, you have this:
| Code: | +----------------+----------------+----------------+
| 257 4 2567 | 3 8 9 | 2567 1 256 |
| 3 8 25 | 1 6 7 | 25 4 9 |
| 17 16 9 | 5 2 4 | 367 8 36 |
+----------------+----------------+----------------+
| 15 9 8 | 2 7 13 | 4 6 35 |
| 4 7 15 | 6 9 13 | 35 2 8 |
| 6 2 3 | 4 5 8 | 9 7 1 |
+----------------+----------------+----------------+
| 127 16 1247 | 8 3 5 | 126 9 24 |
| 8 3 12 | 9 4 6 | 12 5 7 |
| 9 5 46 | 7 1 2 | 8 3 46 |
+----------------+----------------+----------------+
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There are now two ER's in B9, depending on whether you take the hinge pin cell to be R7C9 or R9C7! They take out <6> in R3C9 and R1C7, respectively. The strong links are in C1 and C3.
Or, you can make the same eliminations by noticing the two crossed skyscrapers (turbot fish) emanating from B7.
Or, you can make the same eliminations with the two finned X-wings in R19C39.
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Nov 19, 2007 9:36 pm Post subject: |
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| Code: | -----------------------------------------------------------
| 25 4 76 | 3 8 9 | 76 1 25 |
| 3 8 25 | 1 6 7 | 25 4 9 |
| 17 16 9 | 5 2 4 | @367 8 36 |
-----------------------------------------------------------
| 15 9 8 | 2 7 13 | 4 6 35 |
| 4 7 15 | 6 9 13 | 35 2 8 |
| 6 2 3 | 4 5 8 | 9 7 1 |
-----------------------------------------------------------
| 27 16 47 | 8 3 5 | 16 9 24 |
| 8 3 12 | 9 4 6 | 12 5 7 |
| 9 5 46 | 7 1 2 | 8 3 46 |
----------------------------------------------------------- |
after the finns you get the BUG at r3c7 |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Tue Nov 20, 2007 10:03 am Post subject: |
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| re'born wrote: | | P.S. Don't tell my wife I was here. |
Hee hee.
For myself i decided, that this forum is allowed, cause it doesn't need more than 10 minutes to follow. Of course, yesterday i had the idea to write a little program, that gives me all candidates that can be eliminated, when it looks only at 2,3,...8 boxes (and strong links to the others). Would be interesting. But i will not do it  |
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re'born
Joined: 28 Oct 2007
Posts: 80
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| Posted: Tue Nov 20, 2007 10:31 am Post subject: |
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| ravel wrote: | | re'born wrote: | | P.S. Don't tell my wife I was here. |
Hee hee.
For myself i decided, that this forum is allowed, cause it doesn't need more than 10 minutes to follow.
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Excellent rationalization, ravel!
| ravel wrote: |
Of course, yesterday i had the idea to write a little program, that gives me all candidates that can be eliminated, when it looks only at 2,3,...8 boxes (and strong links to the others). Would be interesting. But i will not do it |
C'mon. You know you want to.  |
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