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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Jun 19, 2010 2:24 pm Post subject: June 19 DB |
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The June 19 DB. Help!
Earl
| Code: |
+-------+-------+-------+
| . . 7 | . . . | . 1 . |
| 2 . . | 7 6 . | . 5 . |
| 8 . . | . . 1 | 7 . . |
+-------+-------+-------+
| . 9 3 | 6 . . | . . . |
| . . 4 | 3 8 9 | 6 . . |
| . . . | . . 7 | 1 9 . |
+-------+-------+-------+
| . . 8 | 1 . . | . . 4 |
| . 5 . | . 4 8 | . . 7 |
| . 7 . | . . . | 9 . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Jun 19, 2010 5:39 pm Post subject: |
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Ouch!
But take a look at the almost naked triple {346} in r123c2 and the consequences of r2c2<>1...
| Quote: | ANT (1=346)r123c2 - (3)r7c2=(3-1)r8c1=r5c1; r5c2<>1
(a gM-wing but with a triple rather than a bivalue at one end)
Then singles... |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Jun 19, 2010 7:47 pm Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 356 346 7 | 8 -2359 2345 | 234 1 269 |
| 2 134 19 | 7 6 34 | 348 5 89 |
| 8 346 569@ | 25# -2359 1 | 7 234 269 |
+----------------+----------------+----------------+
| 57 9 3 | 6 1 25% | 248 247 258 |
| 157 12 4 | 3 8 9 | 6 27 25 |
| 56 8 256@ | 4 25# 7 | 1 9 3 |
+----------------+----------------+----------------+
| 9 236 8 | 1 7 26 | 5 236 4 |
| 136 5 126 | 9 4 8 | 23 236 7 |
| 4 7 26 | 25% 235 23-56 | 9 8 1 |
+----------------+----------------+----------------+ |
| peterj wrote: | Ouch!
But take a look at the almost naked triple {346} in r123c2 and the consequences of r2c2<>1...
ANT (1=346)r123c2 - (3)r7c2=(3-1)r8c1=r5c1; r5c2<>1
(a gM-wing but with a triple rather than a bivalue at one end)
Then singles... |
Your chain could be shorter, and does not need the ALS: 1 in R5C2 forces 1 in R5C1 via R7C2 and R8C1.
I have not solved it (disregarding the chain) but there is a W-wing 25 that takes out 2 as shown. Pincers are #.
In a sort of stacked skyscraper move, the pincers # on 2 can be extended to pincers % on 5. (One or both of # are 2; one or both of % are 5.)
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jun 19, 2010 11:25 pm Post subject: |
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| Quote: | | In a sort of stacked skyscraper move, the pincers # on 2 can be extended to pincers % on 5. (One or both of # are 2; one or both of % are 5.) |
Keith, alternatively, with the 2s cleared from box 2, the strong link on 2 in that box forms another W-Wing on 25. |
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sudocraz
Joined: 28 Apr 2008
Posts: 53
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| Posted: Sun Jun 20, 2010 11:35 pm Post subject: |
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I am not in the same league as most of the people who solve Sudokus on this forum. After basics, all that I can do are x-wings, xy, xyz, unique rectangles 1 through 4, and debug.
Upon reading your posts I knew that this puzzle was going to be hard and that I probably wouldn't be able to solve it. With that in mind, I decided to take some chances with it that I normally wouldn't do. I made some odd leaps of logic. On the far right column, I decided that 258 & 25 made a pair of 25 ,and that 269 & 269 made a pair of 69. Surprisingly it all worked out for me and I finished the puzzle easily.  How is that for luck!  |
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