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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Thu Dec 25, 2008 7:27 pm Post subject: BB Super Hard, Dec 25, 2008 |
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This one takes a few Very Hard steps: | Code: | Puzzle: BB122508sh
+-------+-------+-------+
| 6 . . | . 2 . | . . 5 |
| . . 4 | 7 . 5 | 8 . . |
| . 8 . | . 9 . | . 4 . |
+-------+-------+-------+
| . 6 . | 2 . 4 | . 7 . |
| 4 . 9 | . . . | 6 . 3 |
| . 5 . | 3 . 9 | . 2 . |
+-------+-------+-------+
| . 1 . | . 4 . | . 9 . |
| . . 7 | 8 . 1 | 4 . . |
| 8 . . | . 7 . | . . 1 |
+-------+-------+-------+ |
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 26, 2008 1:22 am Post subject: |
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| Quote: | | W-Wing on 13 plus pincer transport on same |
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sideli123
Joined: 20 Dec 2005
Posts: 7
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| Posted: Fri Dec 26, 2008 4:07 pm Post subject: |
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Very difficult puzzle. I found three x wings 2, 3 and 6's. Couldn't get any further than this. Would love some help.
6 7 - 4 2 8 9 - 5
- - 4 7 - 5 8 - -
- 8 - - 9 - - 4 7
- 6 - 2 8 4 5 7 9
4 2 9 - - 7 6 8 3
7 5 8 3 6 9 1 2 4
- 1 - - 4 - 7 9 8
- - 7 8 - 1 4 - -
8 4 - 9 7 - - - 1 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Dec 26, 2008 4:23 pm Post subject: |
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Sideli123, it is difficult to offer assistance since the exact state of your code is not known after the three x-wings. However, given the code you posted, make the deletions for the x-wing <3>, clean-up and then look for a xy-wing <236>.
For a stronger hint:
| Quote: | xy-wing <236> pivot <36> in r3c6, pincers <23> in r3c7 & <26> in r9c6 to delete <2> r9c7.
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Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 26, 2008 4:43 pm Post subject: |
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Here's a grid with candidates. (Sideli, check that I transcribed your numbers correctly).
| Code: |
+--------------+-----------+-----------+
| 6 7 13 | 4 2 8 | 9 13 5 |
| 1239 39 4 | 7 13 5 | 8 136 26 |
| 1235 8 1235 | 16 9 36 | 23 4 7 |
+--------------+-----------+-----------+
| 13 6 13 | 2 8 4 | 5 7 9 |
| 4 2 9 | 15 15 7 | 6 8 3 |
| 7 5 8 | 3 6 9 | 1 2 4 |
+--------------+-----------+-----------+
| 235 1 2356 | 56 4 236 | 7 9 8 |
| 2359 39 7 | 8 35 1 | 4 356 26 |
| 8 4 2356 | 9 7 236 | 23 356 1 |
+--------------+-----------+-----------+
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Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Dec 26, 2008 6:30 pm Post subject: |
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Oh no!!! Just before using the XY-Wing:
| Code: | strong links (*) on <2> in "L" shape
strong links (#) on <6> in "L" shape
<26> UR [r79c36] => [r7c6]<>6, [r9c3]<>2
*--------------------------------------------------*
| 6 7 13 | 4 2 8 | 9 13 5 |
| 29 39 4 | 7 13 5 | 8 16 26 |
| 135 8 25 | 16 9 36 | 23 4 7 |
|----------------+----------------+----------------|
| 13 6 13 | 2 8 4 | 5 7 9 |
| 4 2 9 | 15 15 7 | 6 8 3 |
| 7 5 8 | 3 6 9 | 1 2 4 |
|----------------+----------------+----------------|
| 35 1 *256# | 56 4 *236 | 7 9 8 |
| 29 39 7 | 8 35 1 | 4 56 26 |
| 8 4 256# | 9 7 *26 # | 23 35 1 |
*--------------------------------------------------*
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| Code: | BUG+2 remaining: [r3c1]=3 and/or [r7c3]=5
[r3c1]=3 [r7c1]=5 => [r7c4],[r9c3]<>5
[r7c3]=5 => [r7c4],[r9c3]<>5
*--------------------------------------------------*
| 6 7 13 | 4 2 8 | 9 13 5 |
| 29 39 4 | 7 13 5 | 8 16 26 |
| 135 8 25 | 16 9 36 | 23 4 7 |
|----------------+----------------+----------------|
| 13 6 13 | 2 8 4 | 5 7 9 |
| 4 2 9 | 15 15 7 | 6 8 3 |
| 7 5 8 | 3 6 9 | 1 2 4 |
|----------------+----------------+----------------|
| 35 1 256 | 56 4 23 | 7 9 8 |
| 29 39 7 | 8 35 1 | 4 56 26 |
| 8 4 56 | 9 7 26 | 23 35 1 |
*--------------------------------------------------*
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I have got to stop trying to solve the VH step manually  |
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sideli123
Joined: 20 Dec 2005
Posts: 7
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| Posted: Fri Dec 26, 2008 6:51 pm Post subject: |
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There it is!! Once I solved for the last x wing 3. The puzzle was solved.
I spent 2 hours trying to solve that puzzle. Couldnt find it. I was happy to see you had put this puzzle on your discussion board.
Thanks again. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sun Dec 28, 2008 10:22 am Post subject: |
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| Code: | .------------------.------------------.------------------.
| 6 7 13 | 4 2 8 | 9 13 5 |
| 1239 39 4 | 7 13 5 | 8 136 26 |
| 1235 8 *25 | 16 9 -36 |*23 4 7 |
:------------------+------------------+------------------:
| 13 6 13 | 2 8 4 | 5 7 9 |
| 4 2 9 | 15 15 7 | 6 8 3 |
| 7 5 8 | 3 6 9 | 1 2 4 |
:------------------+------------------+------------------:
| 235 1 2[5]6 | 56 4 2[3]6 | 7 9 8 |
| 2359 39 7 | 8 35 1 | 4 356 26 |
| 8 4 2[5]6 | 9 7 2[3]6 | 23 35 1 |
'------------------'------------------'------------------' |
in the {2,6} UR either the 3's in r79c6 are true or the 5's in r79c3 are true. 26UR[(3)r79c6 = (5)r79c3]...
can make this chain to eliminate the 3 in r3c6...
26UR[(3)r79c6 = (5)r79c3] - (5=2)r3c3 - (2=3)rc7; r3c6 <> 3
singles.
again, this is just another convoluted way to form a xy-wing. |
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