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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Mon Jul 22, 2013 3:26 pm Post subject: Free Press July 19, 2013 |
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Not yet started ...
| Code: | Puzzle: FP071913
+-------+-------+-------+
| 7 . . | . . . | . 5 4 |
| . . . | 8 . 5 | . . 6 |
| . . . | . 2 . | 7 . . |
+-------+-------+-------+
| 1 . 3 | . 8 . | 9 . . |
| . . . | 9 . 7 | . . . |
| . . 4 | . 6 . | 2 . 3 |
+-------+-------+-------+
| . . 7 | . . . | . . . |
| 8 . . | 1 5 3 | . . . |
| 4 3 . | . . . | . . 8 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Jul 22, 2013 9:41 pm Post subject: |
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Solved by multiple attacks on 6.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Jul 23, 2013 1:08 am Post subject: |
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| This is the same puzzle that Dan posted on the other site as L.A. Times Diabolical of 7-19 and I've been struggling with that. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Jul 23, 2013 1:24 am Post subject: |
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| I struggled, using a W-Wing on 26, an XY-Wing on 25-6 and an XY-Loop that started and ended in c1. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Jul 23, 2013 11:12 am Post subject: |
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After basics:
| Code: | +-------------------+-------------------+-------------------+
| 7 268 268 | 36 1 9 | 38 5 4 |
| 3 4 9 | 8 7 5 | 1 2 6 |
| 56 1568 1568 | 346 2 46 | 7 38 9 |
+-------------------+-------------------+-------------------+
| 1 567 3 | 24 8 24 | 9 67 57 |
| 256 2568 2568 | 9 3 7 | 4568 1468 15 |
| 9 78 4 | 5 6 1 | 2 78 3 |
+-------------------+-------------------+-------------------+
|25-6 125-69 7 |#26 4 8 | 356 1369 125 |
| 8 269 #26 | 1 5 3 | 46 4679 27 |
| 4 3 *1256 | 7 9 *26 | 56 16 8 |
+-------------------+-------------------+-------------------+ |
W-wing.
After that, two XY-wings 25-6 and 25-6 leave us here:
| Code: | +----------------+----------------+----------------+
| 7 #268 28 |#36 1 9 | 38 5 4 |
| 3 4 9 | 8 7 5 | 1 2 6 |
| 56 1568 158 | 34 2 46 | 7 38 9 |
+----------------+----------------+----------------+
| 1 *567 3 | 24 8 24 | 9 *67 57 |
| 256 2568 2568 | 9 3 7 | 4568 1468 15 |
| 9 78 4 | 5 6 1 | 2 78 3 |
+----------------+----------------+----------------+
| 25 1259 7 |#26 4 8 | 356 1369 125 |
| 8 269 26 | 1 5 3 | 46 4679 27 |
| 4 3 1256 | 7 9 #26 | 56 1-6 8 |
+----------------+----------------+----------------+ |
Multicoloring (Extended skyscraper) takes out 6 in R9C8.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 23, 2013 12:35 pm Post subject: |
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I believe that we call this a xy-wing(67-1) with pseudocell pincer (17)r45c9......
| Code: |
*--------------------------------------------------------------------*
| 7 268 268 | 36 1 9 | 38 5 4 |
| 3 4 9 | 8 7 5 | 1 2 6 |
| 56 1568 1568 | 346 2 46 | 7 38 9 |
|----------------------+----------------------+----------------------|
| 1 567 3 | 24 8 24 | 9 b67 c57 |
| 256 2568 2568 | 9 3 7 | 4568 -1468 d15 |
| 9 78 4 | 5 6 1 | 2 78 3 |
|----------------------+----------------------+----------------------|
| 256 12569 7 | 26 4 8 | 356 1369 -125 |
| 8 269 26 | 1 5 3 | 46 4679 27 |
| 4 3 1256 | 7 9 26 | 56 a16 8 |
*--------------------------------------------------------------------*
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xy-wing(76-1): (1=6)r9c8-(6=7)r4c8-(7=5)r4c9-(5=1)r5c9 => r5c8,r7c9<>1
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Jul 23, 2013 3:21 pm Post subject: |
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Ted,
Very nice!
I must say though that the way I solve puzzles would tend to find the solution I posted, not a short chain like yours.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Jul 23, 2013 6:10 pm Post subject: |
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| keith wrote: | Ted,
Very nice!
I must say though that the way I solve puzzles would tend to find the solution I posted, not a short chain like yours.
Keith |
I might've found the chain if I reached the point where looking for chains was my only option, but I'd never have recognized it as an XY-Wing with pseudo cell pincer. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 23, 2013 8:45 pm Post subject: |
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I was checking for xy-wings when I noted the solution. It just jumped out at me since three of the four cells were literally adjacent in box 6. In any case, I normally/frequently look one step past a bivalue cell that is useful but does not complete the xy-wing, and if the additional step is successful, I will continue the process looking for a useful xy-chain.
Ted |
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