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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Mon Sep 15, 2014 7:59 pm Post subject: Sep 16 VH |
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After basics:
| Code: |
+-------------+--------------+--------------+
| 7 3 1 | 268 9 28 | 2568 4 258 |
| 4 26 8 | 1 5 237 | 236 9 27 |
| 5 9 26 | 4 36 2378 | 2368 1 278 |
+-------------+--------------+--------------+
| 2 4568 46 | 3 47 1 | 9 57 568 |
| 1 56 7 | 259 8 259 | 4 3 256 |
| 3 458 9 | 25 47 6 | 258 257 1 |
+-------------+--------------+--------------+
| 69 7 23 | 5689 36 3589 | 1 25 4 |
| 69 1 5 | 69 2 4 | 7 8 3 |
| 8 24 234 | 7 1 35 | 25 6 9 |
+-------------+--------------+--------------+
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Play this puzzle online at the Daily Sudoku site
A standard solution:
| Quote: | | 236 XY wing (a 'double') |
sorts it out. |
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Jeff
Joined: 06 May 2007
Posts: 46
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| Posted: Fri Sep 19, 2014 4:33 pm Post subject: |
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| Could you tell me what "xy wing (a double)" is. I am familiar with an xy wing, but don't know what "a double" indicates. I ended up with the grid you show, but can't seem to get further. Many thanks, |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Fri Sep 19, 2014 4:46 pm Post subject: Sep 16 VH |
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Jeff said
| Quote: | | I am familiar with an xy wing, but don't know what "a double" indicates. |
There are two linked 236 XY-Wings - either r7c3-pivot on r3c3 and r3c5
leading to removal of the 3 in r7c5, or r7c5-pivot on r7c3 and r3c3 leading to
removal of 6 in r3c5. These pairs come up when the two 'solved' elements are
the same pair - in this case 36. It seems to be quite common in these puzzles. |
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Jeff
Joined: 06 May 2007
Posts: 46
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| Posted: Fri Sep 19, 2014 6:12 pm Post subject: |
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| I can't believe that I didn't see that. Thanks. |
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