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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Mar 20, 2010 3:27 pm Post subject: Puzzle 10/03/20 (A) |
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| Code: | +-----------------------+
| . . . | 3 . . | . . . |
| . 2 . | . 7 . | . 9 . |
| . . 6 | . . 9 | 2 . . |
|-------+-------+-------|
| 2 . . | 9 . 7 | 8 . . |
| . 9 . | . 5 . | . 7 . |
| . . 3 | 4 . . | . . . |
|-------+-------+-------|
| . . 9 | 2 . . | 7 1 . |
| . 6 . | . 1 . | 9 5 3 |
| . . . | . . . | . 2 4 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Mar 20, 2010 6:50 pm Post subject: |
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First time I've seen this! After a 48 UR, and cleaning up: | Code: | +----------------+----------------+----------------+
| 9 578 57 | 3 2 18 | 15 4 6 |
| 458 2 45 | 6 7 18 | 3 9 15 |
| 13 13 6 | 5 4 9 | 2 8 7 |
+----------------+----------------+----------------+
| 2 145 145 | 9 6 7 | 8 3 15 |
| 6 9 8 | 1 5 3 | 4 7 2 |
| 157 157 3 | 4 8 2 | 15 6 9 |
+----------------+----------------+----------------+
| 45 45 9 | 2 3 6 | 7 1 8 |
| 78 6 2 | 78 1 4 | 9 5 3 |
| 1378 1378 17 | 78 9 5 | 6 2 4 |
+----------------+----------------+----------------+ |
Look at R16C56. There is a DP 28, so R1C6 must be 1.
(Actually, the elimination of 8 in R1C6 was in a UR I didn't use.)
Danny, are there any solvers that include solved cells in their search for UR's?
Keith
EDIT: See thread in "Solving Techniques".
http://www.dailysudoku.com/sudoku/forums/viewtopic.php?&p=22627#22627 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Mar 21, 2010 4:59 am Post subject: |
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| I didn't use that DP because I had read about it before I did the puzzle. A Type 1 UR (48), Type 4 (13) and a W-Wing (45) did the job. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue Mar 23, 2010 10:38 pm Post subject: |
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Hobiwan just released a new version of HoDoKu. (link is to announcement which contains additional links.)
In this version, you can input a partially solved grid and then add the original puzzle information. HoDoKu then knows where the givens reside in the partially solved grid ... and will find the Avoidable Rectangle Type 1/2 if present.
I tested it on this puzzle and it located Keith's elimination.
Regards, Danny |
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