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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Mon Jan 07, 2008 1:31 am Post subject: 1/7 VH |
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| Code: | 3 2 57 | 15 157 8 | 6 9 4
47 457 6 | 3 9 2 | 57 1 8
8 1 9 | 456 4567 4567 | 57 2 3
------------------------+-------------------------+------------------
2 6 17 | 19 78 3 | 89 4 5
19 8 3 | 1459 145 1459 | 2 7 6
5 479 47 | 2 678 67 | 89 3 1
------------------------+-------------------------+------------------
6 479 2 | 8 3 49 | 1 5 79
47 4579 1457 | 1469 2 1469 | 3 8 79
19 3 8 | 7 15 159 | 4 6 2
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after basics |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Jan 07, 2008 3:02 am Post subject: |
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there is an x-wing on 7, doesn't solve it.
the xy-wing 17-57-15 pincers in r4c3 and r1c4 takes out the 1 in r4c4
and that was it. |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Mon Jan 07, 2008 2:46 pm Post subject: |
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Yes, there were two XY-wings with pivot R1C3: 457 and 157. But the first of these possibly wasn't even needed.
Peter
P.S. note, I had already eliminated the 7 from R2C2 |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Mon Jan 07, 2008 3:51 pm Post subject: |
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There are some ER's present in the grid (Box 4 and 5 for digit <7>) and a finned x-wing on <1> that takes out <1> in R9C5, though they didn't have the power to solve the puzzle in one
step, like the [17-57-15] xy-wing that Norm mentioned. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Jan 07, 2008 5:59 pm Post subject: |
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| I threw the book at this one - starting with an ER in Box 5 to remove <7> from R6C3 - then an xy wing for <179> - then an wyz wing for <479> - then another xy wing. I also spotted a UR in there somewhere. Though I expect there is a one step solution. |
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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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| Posted: Mon Jan 07, 2008 6:18 pm Post subject: |
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| Code: |
+----------------+----------------+---------+
| 3 2 57 | 15 157 8 | 6 9 4 |
| 47 457 6 | 3 9 2 | 57 1 8 |
| 8 1 9 | 456 4567 4567 | 57 2 3 |
+----------------+----------------+---------+
| 2 6 17 | 19 178 3 | 89 4 5 |
| 149 8 3 | 1459 145 1459 | 2 7 6 |
| 5 479 47 | 2 4678 4679 | 89 3 1 |
+----------------+----------------+---------+
| 6 479 2 | 8 3 49 | 1 5 79 |
| 1479 4579 1457 | 1469 2 1469 | 3 8 79 |
| 19 3 8 | 7 15 159 | 4 6 2 |
+----------------+----------------+---------+
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There is an XY wing with 15,57,17 in R1C4,R1C3,R4C3 which eliminates 1 from R4C4. This solves the puzzle.
Prakash |
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