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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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 Posted: Tue Mar 10, 2009 3:45 am Post subject: Very Hard, March 10 |
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A two-stepper for me.
| Quote: | | X-Wing on 8 and W-Wing on 89 |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Tue Mar 10, 2009 5:47 am Post subject: |
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Yes, the x wing on 8s cleared several 8s.
Below is the grid after clearance from the x-wing on 8s.
There was a 5-8-9 xyz that takes out the 8 in r1c3, but that proved to be unneeded.
For me, it was " a 3-8-9 xy wing (taking out yet another eight) that solved the puzzle. "
| Code: |
+-------------+------------+-------------+
| 589 6 1489 | 7 259 89 | 3 1245 18 |
| 3 58 189 | 4 2569 689 | 189 125 7 |
| 2 7 489 | 3 59 1 | 489 45 6 |
+-------------+------------+-------------+
| 58 58 3 | 2 1 7 | 6 9 4 |
| 4 1 2 | 9 36 36 | 7 8 5 |
| 7 9 6 | 5 8 4 | 2 13 13 |
+-------------+------------+-------------+
| 1 34 89 | 6 39 5 | 48 7 2 |
| 6 34 5 | 8 7 2 | 14 134 9 |
| 89 2 7 | 1 4 39 | 5 6 38 |
+-------------+------------+-------------+
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Play this puzzle online at the Daily Sudoku site |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Tue Mar 10, 2009 2:48 pm Post subject: |
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Yes, X-wing on 8 (which I spotted quite quickly for once) and XY on 389
Peter |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Tue Mar 10, 2009 3:17 pm Post subject: |
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| Yes - same as above. I did find an x-wing on <9> and a Type 6 UR (25) -but still ended up having to use the 389 xy-wing. A good one. |
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jj63
Joined: 18 Dec 2009
Posts: 3
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| Posted: Fri Dec 18, 2009 12:50 pm Post subject: |
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Hello, I'm Jonathan.
I've been going through these old sudoku's for the past few months and I'm stuck on this one. I can't see how you find the 5 in r8c3.
________
mflb
Last edited by jj63 on Thu Feb 03, 2011 4:10 pm; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 18, 2009 4:33 pm Post subject: |
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| jj63 wrote: | Hello, I'm Jonathan.
I've been going through these old sudoku's for the past few months and I'm stuck on this one. I can't see how you find the 5 in r8c3. |
Hello Jonathan and welcome to the forum.
| Code: |
+-------------+------------+-------------+
| 589 6 1489 | 7 259 89 | 3 1245 18 |
| 3 58 189 | 4 2569 689 | 189 125 7 |
| 2 7 489 | 3 59 1 | 489 45 6 |
+-------------+------------+-------------+
| 58 58 3 | 2 1 7 | 6 9 4 |
| 4 1 2 | 9 36 36 | 7 8 5 |
| 7 9 6 | 5 8 4 | 2 13 13 |
+-------------+------------+-------------+
| 1 34 89 | 6 39 5 | 48 7 2 |
| 6 34 5 | 8 7 2 | 14 134 9 |
| 89 2 7 | 1 4 39 | 5 6 38 |
+-------------+------------+-------------+
|
Play this puzzle online at the Daily Sudoku site
I don't know how the grid developed, but boxes 8 and 9 already have a 5, so box 7 must have its 5 in row 8. Column 1 has the 589 triple and column 2 has the 58 double, so that leaves column 3. Hope that helps, if not, feel free to post your grid and ask away. |
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jj63
Joined: 18 Dec 2009
Posts: 3
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| Posted: Fri Dec 18, 2009 6:03 pm Post subject: |
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This is as far as I got. I can't see the 7's in box 2,3,8 or the 5's in 7,9.
| Code: | +---------------+---------------+---------------+
| 589 6 1459 | 78 2579 89 | 3 1245 178 |
| 3 58 1589 | 4 25679 689 | 1589 125 178 |
| 2 7 4589 | 3 59 1 | 4589 45 6 |
+---------------+---------------+---------------+
| 58 58 3 | 2 1 7 | 6 9 4 |
| 4 1 2 | 9 36 36 | 7 8 5 |
| 7 9 6 | 5 8 4 | 2 13 13 |
+---------------+---------------+---------------+
| 1 34 89 | 6 349 5 | 48 7 2 |
| 6 34 58 | 178 347 2 | 1458 1345 9 |
| 589 2 7 | 18 349 389 | 1458 6 138 |
+---------------+---------------+---------------+ |
(edited to fix spacing. keith)
________
vapir one
Last edited by jj63 on Thu Feb 03, 2011 4:11 pm; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Dec 18, 2009 10:25 pm Post subject: |
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| Code: | +-------------+---------------+---------------+
| 589 6 1459 | 78 2579 89 | 3 1245 178 |
| 3 58 1589 | 4 25679 689 | 1589 125 178 |
| 2 7 4589 | 3 59 1 | 4589 45 6 |
+-------------+---------------+---------------+
| 58 58 3 | 2 1 7 | 6 9 4 |
| 4 1 2 | 9 36 36 | 7 8 5 |
| 7 9 6 | 5 8 4 | 2 13 13 |
+-------------+---------------+---------------+
| 1 34 89 | 6 349 5 | 48 7 2 |
| 6 34 58 | 178 347 2 | 1458 1345 9 |
| 589 2 7 | 18 349 389 | 1458 6 138 |
+-------------+---------------+---------------+ |
OK Jonathan, here's the answer. The grid that was first posted here by Crunched was after an X-Wing on 8. The X-Wing is in rows 37 and columns 37. That Wing removes the 8 from r8c3. Since we don't know if you're familiar or not with X-Wings, please ask if you're not or try this link:
http://www.sudopedia.org/wiki/X-Wing |
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jj63
Joined: 18 Dec 2009
Posts: 3
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| Posted: Fri Dec 18, 2009 10:39 pm Post subject: |
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Thanks, I didn't see that at all. It's been driving me crazy since last night.
________
Suzuki SX4 specifications |
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