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headache

 
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Fri Aug 10, 2007 10:11 am    Post subject: headache Reply with quote
This one has been in my files for quite a long time.

My notes say it is from daily-sudoku.com (with a dash).

Every time I learn a new technique I try but never manage to solve it.

Anyone got an idea? Maybe something for the coming weekend?

Code:

+--------------------+--------------------+--------------------+
| 1     379   8      | 4     236   29     | 5     3679  36     |
| 36    3459  3569   | 1589  368   7      | 13468 1369  2      |
| 2367  34579 23679  | 1589  368   1589   | .     13679 1346   |
+--------------------+--------------------+--------------------+
| 348   2     135    | 38    9     468    | 136   1356  7      |
| 347   6     137    | 237   5     24     | 123   8     9      |
| 9     3578  357    | 2378  1     268    | 236   4     356    |
+--------------------+--------------------+--------------------+
| 23678 13789 23679  | 12589 2478  12589  | 13467 .     13456  |
| 5     13789 2379   | 6     2478  1289   | 1347  1237  134    |
| 267   17    4      | 125   27    3      | 9     12567 8      |
+--------------------+--------------------+--------------------+
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
PostPosted: Fri Aug 10, 2007 1:49 pm    Post subject: Reply with quote
A word of caution: this looks to be a serious puzzle, a very long way out of my depth.

Sudoku Explainer rated it at 8.9 and used these tricks to solve it:
54 x Hidden Single
1 x Direct Hidden Pair
3 x Naked Single
1 x Direct Hidden Triplet
15 x Pointing
1 x Claiming
1 x Naked Pair
2 x Hidden Pair
1 x Swordfish
1 x Hidden Triplet
1 x Unique Rectangle type 1
3 x Bidirectional Y-Cycle
3 x Turbot Fish
2 x Forcing X-Chain
8 x Forcing Chain
9 x Region Forcing Chains
4 x Cell Forcing Chains
1 x Dynamic Region Forcing Chains
1 x Dynamic Cell Forcing Chains

Whether 25 forcing chains are actually necessary may be open to question but I shall leave it to the more robust solvers to find out.

Steve
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