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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Jan 05, 2008 6:08 pm Post subject: Freep Jan 4, 2008 |
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Have fun! I enjoyed it.
| Code: | Puzzle: FP010408
+-------+-------+-------+
| . . . | . . . | . 5 . |
| . . 1 | . . 9 | 3 . . |
| 9 . . | 7 . 1 | . . . |
+-------+-------+-------+
| . . 5 | . 9 . | 4 . 7 |
| 6 . . | . 2 . | . . 3 |
| 2 . 9 | . 4 . | 6 . . |
+-------+-------+-------+
| . . . | 5 . 2 | . . 1 |
| . . 4 | 8 . . | 2 . . |
| . 1 . | . . . | . . . |
+-------+-------+-------+ |
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Jan 05, 2008 8:58 pm Post subject: |
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| Code: | 4 678 678 | 2 368 36 | 1 5 9
58 568 1 | 4 68 9 | 3 7 2
9 2 3 | 7 5 1 | 8 6 4
------------------------+-------------------------+------------------
1 3 5 | 6 9 8 | 4 2 7
6 4 78 | 1 2 57 | 59 89 3
2 78 9 | 3 4 57 | 6 1 58
------------------------+-------------------------+------------------
38 689 68 | 5 367 2 | 79 4 1
7 569 4 | 8 1 36 | 2 39 56
35 1 2 | 9 367 4 | 57 38 568
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Jan 05, 2008 9:12 pm Post subject: |
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| Code: | 4 678 G678 | 2 368 3g6 | 1 5 9
58 568 1 | 4 68 9 | 3 7 2
9 2 3 | 7 5 1 | 8 6 4
------------------------+-------------------------+------------------
1 3 5 | 6 9 8 | 4 2 7
6 4 78 | 1 2 57 | 59 89 3
2 78 9 | 3 4 57 | 6 1 58
------------------------+-------------------------+------------------
38 689 R68 | 5 3(6)7 2 | 79 4 1
7 569 4 | 8 1 3r6 | 2 39 56
35 1 2 | 9 367 4 | 57 38 568 |
first thing I saw was coloring on 6 marked in the grid, takes out the 6 in r7c5, but that doesn't solve the puzzle. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Jan 05, 2008 9:25 pm Post subject: |
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| Code: | 4 678 678 | 2 368 36 | 1 5 9
58 568 1 | 4 68 9 | 3 7 2
9 2 3 | 7 5 1 | 8 6 4
------------------------+-------------------------+------------------
1 3 5 | 6 9 8 | 4 2 7
6 4 78 | 1 2 57 | 59 89 3
2 78 9 | 3 4 57 | 6 1 58
------------------------+-------------------------+------------------
38 689 68 | 5 *37 2 | *79 4 1
7 59 4 | 8 1 3-6 | 2 *39 56
35 1 2 | 9 367 4 | 57 38 568
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that 6 elmination leaves the grid above, then...
the xy-wing with pincers in r7c5 and r8c8 finishes it off, takes out the 3 in r8c6. go Steelers !! |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Jan 05, 2008 10:15 pm Post subject: |
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norm,
In your first grid, the strong link on <8> in C1 connects the cells <68> to make a W-wing which eliminates the same <6>. Then, I too found the XY-wing.
Your multi-coloring is also a "skyscraper".
Keith |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Jan 05, 2008 11:11 pm Post subject: |
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Another step to clean up the <6> in R7C5 is an ER(T-shaped hinge) for digit <6> in Box 7
| Code: |
4 678 678 | 2 368 36 | 1 5 9
58 *568 1 | 4 *68 9 | 3 7 2
9 2 3 | 7 5 1 | 8 6 4
------------------------+-------------------------+------------------
1 3 5 | 6 9 8 | 4 2 7
6 4 78 | 1 2 57 | 59 89 3
2 78 9 | 3 4 57 | 6 1 58
------------------------+-------------------------+------------------
38 689 68 | 5 3-[6]7 2 | 79 4 1
7 er 569 4 er | 8 1 36 | 2 39 56
35 er 1 2 er | 9 367 4 | 57 38 568
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jan 05, 2008 11:21 pm Post subject: |
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After the initial scan, I noted a BUG+9 pattern, but I decided to pursue other avenues. 
A Finned X-Wing and Skyscraper, both on 6, opened things up just enough to allow my new friend Medusa to do her thing and finish it off. Thanks again Keith, for introducing me to this technique. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 06, 2008 12:14 am Post subject: |
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| Marty R. wrote: | | After the initial scan, I noted a BUG+9 pattern, but I decided to pursue other avenues. |
Marty,
Perhaps we should make T-shirts for Sudoku addicts:
No Problem!
It's only a BUG+81.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jan 06, 2008 1:33 am Post subject: |
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| Quote: | No Problem!
It's only a BUG+81. |
Sounds like the best insect repellent on the planet!  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jan 06, 2008 1:45 am Post subject: |
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The only possible BUG+81:
| Code: | +-------------------------------+-------------------------------+-------------------------------+
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
+-------------------------------+-------------------------------+-------------------------------+
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
+-------------------------------+-------------------------------+-------------------------------+
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
| 123456789 123456789 123456789 | 123456789 123456789 123456789 | 123456789 123456789 123456789 |
+-------------------------------+-------------------------------+-------------------------------+ |
Keith |
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