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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Thu May 07, 2009 5:31 pm Post subject: Vanhegan extreme |
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This is puzzle #6-283136, rated 1.2.0.1.1. I can't even make a single move. I wonder what I missed.
| Code: |
+-------+-------+-------+
| 1 . 4 | . 5 . | . . 7 |
| . 9 . | . . . | . 4 . |
| . . 7 | . . 3 | 6 . 1 |
+-------+-------+-------+
| . . 5 | . 4 . | . . . |
| 2 . . | 8 . 6 | . . 9 |
| . . . | . 3 . | 4 . . |
+-------+-------+-------+
| 4 . 6 | 7 . . | 9 . . |
| . 3 . | . . . | . 2 . |
| 9 . . | . 6 . | 8 . 4 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu May 07, 2009 8:42 pm Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 1 268 4 | 269 5 289 | 23 389 7 |
| 3568 9 238 | 126 1278 1278 | 25 4 258 |
| 58 258 7 | 4 289 3 | 6 589 1 |
:---------------------+---------------------+---------------------:
| 3678 1678 5 | 129 4 1279 | 1237 13678 238 |
| 2 4 13 | 8 17 6 | 1357 1357 9 |
| 678 1678 9 | 125 3 1257 | 4 1678 28 |
:---------------------+---------------------+---------------------:
| 4 1258 6 | 7 128 1258 | 9 135 35 |
| 578 3 18 | 159 189 4 | 157 2 6 |
| 9 1257 12 | 3 6 125 | 8 157 4 |
'---------------------'---------------------'---------------------' |
I managed to find these two to start things off with.
(2=5)r2c7 - (5)r2c9 = (5-3)r7c9 = (3)r7c8 - (3)r1c8 = (3)r1c7; r1c7 <> 2
(8=3)r2c3 - (3)r5c3 = (3)r5c8 - (3)r7c8 = (3-5)r7c9 = (5)r2c9; r2c9 <> 8
leaves this grid.
| Code: | .------------------.------------------.------------------.
| 1 268 4 | 269 5 289 | 3 89 7 |
| 368 9 38 | 16 178 178 | 25 4 25 |
| 58 258 7 | 4 289 3 | 6 89 1 |
:------------------+------------------+------------------:
| 3678 1678 5 | 129 4 1279 | 127 1367 238 |
| 2 4 13 | 8 17 6 | 157 1357 9 |
| 678 1678 9 | 125 3 1257 | 4 167 28 |
:------------------+------------------+------------------:
| 4 158 6 | 7 128 1258 | 9 135 35 |
| 578 3 18 | 159 189 4 | 157 2 6 |
| 9 157 2 | 3 6 15 | 8 157 4 |
'------------------'------------------'------------------' |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu May 07, 2009 10:44 pm Post subject: |
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| It's solvable with fish and fundamental chains, but the solution is ugly and lengthy. There's probably an ALS -- which I consider to be a network technique -- that makes an important elimination and shortens the solution. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri May 08, 2009 1:13 am Post subject: |
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| Thanks. This seems unusually difficult for one of these. |
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