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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Sun Apr 06, 2008 7:30 pm Post subject: Dont use pencilmarks here |
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| Code: | +-------+-------+-------+
| . . 1 | . . 2 | 3 . . |
| . 3 . | . . . | . 4 . |
| 5 . . | 6 . . | . . 7 |
+-------+-------+-------+
| . . 4 | 1 . . | . . 5 |
| . . . | . . . | . . . |
| 2 . . | . . 7 | 6 . . |
+-------+-------+-------+
| 6 . . | . . 5 | . . 2 |
| . 7 . | . . . | . 8 . |
| . . 3 | 4 . . | 7 . . |
+-------+-------+-------+ Mauricio |
If you fill in the pencilmarks, you probably will not to see the wood for the trees.
There are 3 hidden pairs at the beginning. One of them leads to the first number.
At least one advanced (but easy-to-spot) step needed later. |
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Victor
Joined: 29 Sep 2005
Posts: 207
Location: NI
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| Posted: Sun Apr 06, 2008 8:41 pm Post subject: |
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| Lots of 89s, some of which can be established as conjugate, via the 8s: then kill 9s. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Apr 06, 2008 10:36 pm Post subject: |
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I'll be the contrarian; I can't kick the PMs habit and can't spot hidden pairs and triples. This was certainly an interesting puzzle, with no freebies at the start and a huge number of polyvalued cells.
I spotted the hidden pairs via the complementary naked quads and quints. Then a pattern emerged, where it seemed every time a cell was solved or number(s) eliminated via locked candidates, a hidden single or naked triple or quad emerged.
This continued until most cells were down to two or three candidates, most of which were 1s, 8s and 9s. Then the advanced step mentioned by Ravel was played, solving the puzzle. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Apr 07, 2008 12:54 am Post subject: |
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| Code: | 4 6 1 | 789 789 2 | 3 5 89
89 3 7 | 5 189 189 | 2 4 6
5 2 R8G9 | 6 3 4 | 1G89 19 7
------------------------------------------------------------------
7 89 4 | 1 6 3 | R8G9 2 5
3 189 6 | 2 5 89 | 4 7 189
2 189 5 | 89 4 7 | 6 19 3
------------------------------------------------------------------
6 4 G8R9 | 789 1789 5 | 1-9 3 2
19 7 2 | 3 19 6 | 5 8 4
189 5 3 | 4 2 189 | 7 6 19 |
this is the one step medusa solution. the 9 in r7c7 is quickly eliminated from seeing a red nine in r7c3 and a green 9 in r3c7. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Apr 07, 2008 3:56 am Post subject: |
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| Quote: | | this is the one step medusa solution. the 9 in r7c7 is quickly eliminated from seeing a red nine in r7c3 and a green 9 in r3c7. |
That works too. I used the W-Wing on 89 in boxes 3 and 6, connected by the 9s in column 8. |
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