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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Oct 13, 2007 11:24 am Post subject: Sat Oct 13 DB |
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Here is the Oct 13 DB as in the St. Louis paper.
I had to use strong pairs as pincers (coloring?) three times to solve it.
Earl
PS There is also an x-y wing based at R7C7 which solves it.
| Code: |
+-------+-------+-------+
| . . . | 8 . . | . . 7 |
| 4 . . | . 7 . | 5 . . |
| . 6 . | . 9 . | . . 8 |
+-------+-------+-------+
| . . 1 | 6 5 . | 2 . . |
| 6 8 . | . . . | . 7 5 |
| . . 9 | . 8 7 | 1 . . |
+-------+-------+-------+
| 7 . . | . 4 . | . 3 . |
| . . 4 | . 6 . | . . 1 |
| 9 . . | . . 3 | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Last edited by Earl on Sat Oct 13, 2007 2:25 pm; edited 1 time in total |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Sat Oct 13, 2007 12:55 pm Post subject: |
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Basics run out here:
| Code: |
*-----------------------------------------------------------*
| 12 5 3 | 8 12 46 | 469 49 7 |
| 4 9 8 | 3 7 126 | 5 12 26 |
| 12 6 7 | 145 9 1245 | 3 124 8 |
|-------------------+-------------------+-------------------|
| 3 7 1 | 6 5 49 | 2 8 49 |
| 6 8 2 | 149 3 149 | 49 7 5 |
| 5 4 9 | 2 8 7 | 1 6 3 |
|-------------------+-------------------+-------------------|
| 7 12 56 | 159 4 8 | 69 3 269 |
| 8 3 4 | 59 6 259 | 7 259 1 |
| 9 12 56 | 7 12 3 | 8 45 46 |
*-----------------------------------------------------------*
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Coloring on <4> solves it. |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Sat Oct 13, 2007 2:23 pm Post subject: Sat Oct 13 DB |
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Looking at Tracy's grid I saw an x-y wing based at R7C7 which eliminates the <4> at R4C9 and opens the puzzle.
Earl |
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klimke
Joined: 17 Aug 2007
Posts: 5
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| Posted: Sat Oct 13, 2007 3:15 pm Post subject: |
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| I also noted an XYZ wing pivoting at r7c9 eliminating the 6 in r9c9 |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Oct 13, 2007 5:19 pm Post subject: |
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| The same XYZ-wing that klimke noted was the final step for me. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 13, 2007 6:12 pm Post subject: |
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| I used basically the same XY-Wing, except the one that was pivoted in r9c9, which is really the same as the one in r7c7. |
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