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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Sep 08, 2007 11:56 am Post subject: DB Saturday Puzzle: September 8, 2007 |
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Still working on it ...
| Code: | Puzzle: DB090807 ******
+-------+-------+-------+
| 3 8 . | . . 5 | 6 . . |
| . . . | . . 4 | 5 . 8 |
| 4 . 5 | . . 7 | . . . |
+-------+-------+-------+
| . . . | . 4 9 | . . 5 |
| . 2 3 | . . . | 4 6 . |
| 5 . . | 7 3 . | . . . |
+-------+-------+-------+
| . . . | 4 . . | 1 . 6 |
| 2 . 4 | 1 . . | . . . |
| . . 1 | 5 . . | . 3 4 |
+-------+-------+-------+
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Keith |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Sat Sep 08, 2007 12:48 pm Post subject: |
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I'm pretty sure I reached this point using nothing but basic stuff:
| Code: |
*--------------------------------------------------*
| 3 8 7 | 9 12 5 | 6 4 12 |
| 16 9 2 | 3 16 4 | 5 7 8 |
| 4 16 5 | 26 8 7 | 29 19 3 |
|----------------+----------------+----------------|
| 17 17 68 | 26 4 9 | 3 28 5 |
| 9 2 3 | 8 5 1 | 4 6 7 |
| 5 4 68 | 7 3 26 | 289 19 12 |
|----------------+----------------+----------------|
| 78 35 9 | 4 27 238 | 1 258 6 |
| 2 35 4 | 1 67 368 | 78 58 9 |
| 678 67 1 | 5 9 28 | 278 3 4 |
*--------------------------------------------------*
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at which point I found two ways, one an XY-wing, the other a W-wing with coloring. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sat Sep 08, 2007 6:50 pm Post subject: |
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| ....strong links on 2's and some xy chains.... |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sat Sep 08, 2007 7:45 pm Post subject: |
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| .....and on a second look at Tracy's position there is a single XY chain that opens up the whole thing removing the 7 at r7c1. Pincers at r4c1 and r7c5. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Sep 08, 2007 9:01 pm Post subject: |
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I did a coloring on <2> which did not lead anywhere.
The XY-wing on <278> in R79 takes out <8> in R9C1, and the puzzle is done.
Keith |
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