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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Wed Apr 20, 2011 10:07 pm Post subject: April 21 VH |
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| Type 1 UR 78 solves it by eliminating 78 in r8c4. |
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Thu Apr 21, 2011 8:30 am Post subject: |
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| I found it somewhat unusual and therefore good. For those who donīt like UR:s, a twostepper: An x-wing on 9 revealed a triplet 124 giving r5c6=9. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Thu Apr 21, 2011 2:59 pm Post subject: |
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| Quote: | | a twostepper: An x-wing on 9 revealed a triplet 124 |
..a onestepper - triplets don't count as VH steps. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 21, 2011 3:52 pm Post subject: |
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Someone help me out here. I can't get the 124 triple after the X-Wing because I haven't figured out how to get rid of the 8 from r9c6.
| Code: |
+-----------+------------+---------+
| 579 59 1 | 89 6 789 | 3 4 2 |
| 2 4 8 | 1 3 5 | 6 9 7 |
| 79 3 6 | 4 2 79 | 8 1 5 |
+-----------+------------+---------+
| 1 6 37 | 23 8 24 | 47 5 9 |
| 49 2 5 | 6 7 49 | 1 3 8 |
| 489 89 37 | 359 15 149 | 47 2 6 |
+-----------+------------+---------+
| 3 1 2 | 78 9 6 | 5 78 4 |
| 6 58 9 | 578 4 3 | 2 78 1 |
| 58 7 4 | 258 15 128 | 9 6 3 |
+-----------+------------+---------+
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Play this puzzle online at the Daily Sudoku site |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Thu Apr 21, 2011 4:12 pm Post subject: |
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After the x wing in 9 you can remove the 9s from r1c1 r1c6
This reveals an xy wing 578 pivot at r1c1 eliminating the 8 from r9c6 and solving the puzzle.
I must admit I did not follow the reasoning give above by roaa, since if r9c6 is not 8 then the puzzle has already been solved. As can be proved by going to the empty puzzle in draw/play and entering the 8 in r1c6 and then grade button. It will no longer be very difficult but medium
Last edited by George Woods on Thu Apr 21, 2011 4:20 pm; edited 1 time in total |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Thu Apr 21, 2011 4:17 pm Post subject: |
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| Marty: The only way I see to get rid of the 8 is a UR on 78. And then I don't see a triple. A quad maybe (though not really needed). |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Apr 21, 2011 5:05 pm Post subject: |
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George's XY-Wing after the X-Wing was the only thing I found that uses just the techniques that are needed to solve these, i.e., X-, XY- and XYZ-Wing.
In addition to the Type 1 UR on 78, there's an M-Wing on 89. |
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Sat Apr 23, 2011 7:39 am Post subject: |
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| Sorry! I must have made a mistake in the elimination of the 8. In a new attempt I have to use the xy-wing after the x-wing! |
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