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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Wed Aug 05, 2009 10:37 pm Post subject: Daily Sudoku:Thu 6-Aug-2009 VH |
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| XY-Wing <78> - <67> - <68> eliminating 8 in r7c8 solves the puzzle. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Wed Aug 05, 2009 11:38 pm Post subject: |
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| On my first attempt, the puzzle fell apart with simple box line interactions. So I tried again from a different approach and the same thing happened. Have I been twice lucky (or unlucky!) or have others found the same thing? |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Aug 06, 2009 12:36 am Post subject: |
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I needed more than basics.
| Code: |
+-----------+--------------+--------------+
| 39 49 8 | 3467 5 3467 | 67 1 2 |
| 7 6 2 | 1 9 8 | 4 3 5 |
| 13 5 14 | 3467 2 3467 | 9 68 78 |
+-----------+--------------+--------------+
| 4 8 13 | 5 13 26 | 26 7 9 |
| 19 2 6 | 789 14 79 | 3 5 48 |
| 5 7 39 | 689 34 269 | 268 468 1 |
+-----------+--------------+--------------+
| 2 349 5 | 49 6 1 | 78 489 3478 |
| 6 349 7 | 2 8 5 | 1 49 34 |
| 8 1 49 | 349 7 349 | 5 2 6 |
+-----------+--------------+--------------+
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Play this puzzle online at the Daily Sudoku site
| Quote: | | An M-Wing on 78 in boxes 39 does the trick. Makes the same elimination as Clement's XY-Wing |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Aug 06, 2009 2:26 am Post subject: |
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| kragzy wrote: | | On my first attempt, the puzzle fell apart with simple box line interactions. So I tried again from a different approach and the same thing happened. Have I been twice lucky (or unlucky!) or have others found the same thing? |
is it possible for you to list the exact steps you made? which singles you found one at a time?
maybe by going through it step by step, it will be more clear to the readers of the forum how you made your progression through the puzzle.
that way one of the readers can help pinpoint a move which may or may not have been seen by others in solving the puzzle.
big question to ask, sorry in advance. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Thu Aug 06, 2009 3:16 am Post subject: |
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My daily sudoku is a diversion during my morning tea break at work so I may not have enough time to write every step down, but tomorrow morning I will do the puzzle again and watch myself really closely!!! When I find my lucky mistake, I will confess to all.  |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Aug 06, 2009 3:22 am Post subject: |
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| Code: | .------------------.------------------.------------------.
| 39 49 8 | 3467 5 3467 |*67 1 2 |
| 7 6 2 | 1 9 8 | 4 3 5 |
| 13 5 14 | 3467 2 3467 | 9 *68 *78 |
:------------------+------------------+------------------:
| 4 8 13 | 5 13 26 | 26 7 9 |
| 19 2 6 | 789 14 79 | 3 5 48 |
| 5 7 39 | 689 34 269 | 268 468 1 |
:------------------+------------------+------------------:
| 2 349 5 | 49 6 1 |*78 4-89 3478 |
| 6 349 7 | 2 8 5 | 1 49 34 |
| 8 1 49 | 349 7 349 | 5 2 6 |
'------------------'------------------'------------------' |
m-wing
(8=7)r7c7 - (7)r1c7 = (7-8)r3c9 = (8)r3c8; r7c8 <> 8
I guess those cells contain the xy-wing also. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Thu Aug 06, 2009 7:19 am Post subject: |
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| kragzy wrote: | | On my first attempt, the puzzle fell apart with simple box line interactions. So I tried again from a different approach and the same thing happened. Have I been twice lucky (or unlucky!) or have others found the same thing? |
I had the same thing happen to me one time. I think I boo-booed.
Below is the grid I got after basics. There are 2 x-wings on 3s, which take out some 3s, but they seem to otherwise do no good.
I had to use the 78-67-68 xy wing to get it done.
| Code: |
+------------+--------------+--------------+
| 39 49 8 | 3467 5 3467 | 67 1 2 |
| 7 6 2 | 1 9 8 | 4 3 5 |
| 13 5 14 | 3467 2 3467 | 9 68 78 |
+------------+--------------+--------------+
| 4 8 13 | 5 13 26 | 26 7 9 |
| 19 2 6 | 789 14 79 | 3 5 48 |
| 5 7 39 | 689 34 269 | 268 468 1 |
+------------+--------------+--------------+
| 2 349 5 | 349 6 1 | 78 489 3478 |
| 6 349 7 | 2 8 5 | 1 49 34 |
| 8 1 349 | 349 7 349 | 5 2 6 |
+------------+--------------+--------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Aug 06, 2009 1:58 pm Post subject: |
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Another one step solution is the Type 3 UR 26 in r46c67. To prevent the deadly UR, either r6c6=9 or r6c7=8. Both result in r5c6=7 to solve the puzzle.
(9)r6c6 - (9=7)r5c6;
(8)r6c7 - (8)r6c4 = (8-7)r5c4 = (7)r5c6.
Ted |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Thu Aug 06, 2009 7:33 pm Post subject: |
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| kragzy wrote: | | On my first attempt, the puzzle fell apart with simple box line interactions. So I tried again from a different approach and the same thing happened. Have I been twice lucky (or unlucky!) or have others found the same thing? |
I too completed the puzzle without coming across any advanced techniques. Must have made the same lucky mistake. What a coincidence.
Peter |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Fri Aug 07, 2009 4:52 am Post subject: |
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Confession time! I did this puzzle again today, laboriously watching my every move and sure enough strayed well into VH territory - XY wing required. Peter, I don't know what we did!
Cheers  |
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