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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Fri Oct 05, 2012 4:21 pm Post subject: Free Press October 5, 2012 |
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| Code: | Puzzle: FP100512
+-------+-------+-------+
| . . . | . . 4 | 3 . . |
| 2 . 1 | 8 . . | 4 . . |
| 7 . . | 2 1 . | . . 6 |
+-------+-------+-------+
| . . . | . 2 . | 6 . . |
| . 6 . | 3 . 5 | . 8 . |
| . . 4 | . 9 . | . . . |
+-------+-------+-------+
| . . . | . 3 1 | . . 8 |
| . . 3 | . . 6 | 2 . 4 |
| . . 8 | 9 . . | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Oct 05, 2012 6:58 pm Post subject: |
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| Code: | +-----------------+----------+------------+
| 68-9 *89 69 | 57 57 4 | 3 2 1 |
| 2 3 1 | 8 6 9 | 4 57 57 |
| 7 4 5 | 2 1 3 | 8 9 6 |
+-----------------+----------+------------+
| 3 5789 79 | 1 2 78 | 6 4 579 |
| 19 6 279 | 3 4 5 | 17 8 279 |
| 158 2578 4 | 6 9 78 | 157 3 257 |
+-----------------+----------+------------+
| 56 257 267 | 4 3 1 | 9 57 8 |
| *59 57-9 3 | 57 8 6 | 2 1 4 |
| 4 1 8 | 9 57 2 | 57 6 3 |
+-----------------+----------+------------+ |
I'm not very happy with this solution because I'm sure I missed something with the 57s or something else. I had a so-called Bug-Lite set up but couldn't do anything with it.
R1c2=8-->r8c1=9 with a fairly long chain; r1c1, r8c2<>9. Eliminations therefrom lead to a BUG+1. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Oct 05, 2012 9:53 pm Post subject: |
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I have not yet looked at it, but Sudoku Susser says:
1 x Simple Forcing Chains
1 x Simple Forcing Loops
1 x XY-Wing
1 x BUG Removal
1 x Intersection Removal
26 x Pinned Squares
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Fri Oct 05, 2012 10:21 pm Post subject: |
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None of my solver's solutions were "friendly" for this puzzle. There were a few chains that each led to a BUG+1, but Marty has already found that option. However, my solver did find a crazy single step solution using a UR. For the fun of it:
| Code: | after basics/Singles
+--------------------------------------------------------------+
| 69-8 89 69 | 57 57 4 | 3 2 1 |
| 2 3 1 | 8 6 9 | 4 57 57 |
| 7 4 5 | 2 1 3 | 8 9 6 |
|--------------------+--------------------+--------------------|
| 3 *78+59 79 | 1 2 *78 | 6 4 579 |
| 19 6 279 | 3 4 5 | 17 8 279 |
| 158 *78+25 4 | 6 9 *78 | 157 3 257 |
|--------------------+--------------------+--------------------|
| 56 257 267 | 4 3 1 | 9 57 8 |
| 59 579 3 | 57 8 6 | 2 1 4 |
| 4 1 8 | 9 57 2 | 57 6 3 |
+--------------------------------------------------------------+
# 43 eliminations remain
[r46c26]=UR78 => r4c2=9, r46c2=5, r6c2=2
(9)r4c2 - (9=8)r1c2 - (8)r1c1
(5)r46c2 - (5)r6c1 = (1)r6c1 - (1=9)r5c1 - r8c1 = r8c2 - (9=8)r1c2 - (8)r1c1
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(8)r6c1 - (8)r1c1
(2)r6c2 - (2=175)r5c7,r6c79 - (5)r6c1 (see above)
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SudoQ
Joined: 02 Aug 2011
Posts: 127
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| Posted: Sat Oct 06, 2012 6:38 am Post subject: |
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A contradiction networks without BUGs and URs:
| Code: | | r1c1=8 -> r1c2=9 -> r8c1=9 -> r5c1=1 -> r5c7=7, r6c1=5 -> r7c8=7 -> r4c3=7 -> r4c9=59 => r1c1<>8 |
/SudoQ |
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