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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Wed Oct 22, 2014 11:19 am Post subject: Oct 22 VH |
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After basics: | Code: |
+---------+----------------+---------------+
| 9 8 3 | 147 124 1247 | 12 5 6 |
| 2 5 4 | 18 6 9 | 3 7 18 |
| 6 1 7 | 58 258 3 | 289 29 4 |
+---------+----------------+---------------+
| 3 27 9 | 48 248 6 | 5 1 78 |
| 14 26 5 | 1489 7 1248 | 489 369 389 |
| 14 67 8 | 3 1459 145 | 479 69 2 |
+---------+----------------+---------------+
| 7 3 2 | 6 189 18 | 19 4 5 |
| 5 9 1 | 2 34 47 | 6 8 37 |
| 8 4 6 | 1579 1359 157 | 1279 239 1379 |
+---------+----------------+---------------+
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Play this puzzle online at the Daily Sudoku site
A 2 stepper was the best I could do:(select box to view)
| Quote: | | 129 XY-Wing pivot r1c7 leading to 189 XY-wing pivot r5c9 |
Hugh |
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Jeff
Joined: 06 May 2007
Posts: 46
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| Posted: Sat Oct 25, 2014 1:46 am Post subject: |
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I come up with a somewhat different grid after using various straight forward operations. For example I was able to get rid of several 4's in the 5th Box, plus some 9's in Rows 5 and 9. The only problem I have now is I can't seem to get any further. Need help! I don't see how one can get a 189 xy pivoted on R5C9. Would appreciate some help. Many thanks,
| Code: |
+----------+---------------+-------------+
| 9 8 3 | 147 124 1247 | 12 5 6 |
| 2 5 4 | 18 6 9 | 3 7 18 |
| 6 1 7 | 58 258 3 | 289 29 4 |
+----------+---------------+-------------+
| 3 27 9 | 48 248 6 | 5 1 78 |
| 14 26 5 | 189 7 128 | 48 36 389 |
| 14 67 8 | 3 159 15 | 479 69 2 |
+----------+---------------+-------------+
| 7 3 2 | 6 189 18 | 19 4 5 |
| 5 9 1 | 2 34 47 | 6 8 37 |
| 8 4 6 | 1579 135 157 | 127 23 1379 |
+----------+---------------+-------------+
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Oct 25, 2014 2:18 am Post subject: |
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| Jeff wrote: | I come up with a somewhat different grid after using various straight forward operations. For example I was able to get rid of several 4's in the 5th Box, plus some 9's in Rows 5 and 9. The only problem I have now is I can't seem to get any further. Need help! I don't see how one can get a 189 xy pivoted on R5C9. Would appreciate some help. Many thanks,
| Code: |
+----------+---------------+-------------+
| 9 8 3 | 147 124 1247 | 12 5 6 |
| 2 5 4 | 18 6 9 | 3 7 18 |
| 6 1 7 | 58 258 3 | 289 29 4 |
+----------+---------------+-------------+
| 3 27 9 | 48 248 6 | 5 1 78 |
| 14 26 5 | 189 7 128 | 48 36 389 |
| 14 67 8 | 3 159 15 | 479 69 2 |
+----------+---------------+-------------+
| 7 3 2 | 6 189 18 | 19 4 5 |
| 5 9 1 | 2 34 47 | 6 8 37 |
| 8 4 6 | 1579 135 157 | 127 23 1379 |
+----------+---------------+-------------+
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Jeff,
In the position you posted, there is a 12-9 XY-wing in C78. A further advanced step is then still required.
Keith |
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Jeff
Joined: 06 May 2007
Posts: 46
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| Posted: Sat Oct 25, 2014 4:00 am Post subject: |
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| I had overlooked that the 9 could be eliminated in R3C7 through the 129 xy wing. Thanks, |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Sun Oct 26, 2014 11:13 am Post subject: |
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| Jeff wrote: | I come up with a somewhat different grid after using various straight forward operations. For example I was able to get rid of several 4's in the 5th Box, plus some 9's in Rows 5 and 9. The only problem I have now is I can't seem to get any further. Need help! I don't see how one can get a 189 xy pivoted on R5C9. Would appreciate some help. Many thanks,
| Code: |
+----------+---------------+-------------+
| 9 8 3 | 147 124 1247 | 12 5 6 |
| 2 5 4 | 18 6 9 | 3 7 18 |
| 6 1 7 | 58 258 3 | 289 29 4 |
+----------+---------------+-------------+
| 3 27 9 | 48 248 6 | 5 1 78 |
| 14 26 5 | 189 7 128 | 48 36 389 |
| 14 67 8 | 3 159 15 | 479 69 2 |
+----------+---------------+-------------+
| 7 3 2 | 6 189 18 | 19 4 5 |
| 5 9 1 | 2 34 47 | 6 8 37 |
| 8 4 6 | 1579 135 157 | 127 23 1379 |
+----------+---------------+-------------+
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I'm sure I'm being stupid here- I can see the box-line that rids box 5 of
excess fours  , but I can't for the life of me see how to get rid of those 9s
in r5 and 9 .....
Help!
Hugh |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Sun Oct 26, 2014 12:38 pm Post subject: |
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| Hi Hugh, The 9's that Jeff mentioned eliminating in r5 and 9 have already been eliminated in the starting diagram. The 9's in r5 and 9 of the starting diagram form an x-wing that eliminates the other 9's in r5 and 9. The excess 9's in the starting diagram won't be eliminated until after you apply both of the XY-wings that you pointed out. |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Mon Oct 27, 2014 10:23 am Post subject: |
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| dongrave wrote: | | Hi Hugh, The 9's that Jeff mentioned eliminating in r5 and 9 have already been eliminated in the starting diagram. The 9's in r5 and 9 of the starting diagram form an x-wing that eliminates the other 9's in r5 and 9. The excess 9's in the starting diagram won't be eliminated until after you apply both of the XY-wings that you pointed out. |
Ah, I see. I wasn't looking for wings!
Thanks
Hugh |
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