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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Sat Apr 16, 2011 10:24 pm Post subject: April 17 VH |
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| XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9. |
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Ema Nymton
Joined: 17 Apr 2009
Posts: 89
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| Posted: Sun Apr 17, 2011 10:13 am Post subject: |
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The solution "XY-Wing 19 18 89 pivoted in r5c1 solves it by setting r9c9<>9." not withstanding, a question comes up.
| Code: |
+-------------+----------+--------------+
| 4 8 1 | 25 7 59 | 239 6 239 |
| 3 259 57 | 26 1 69 | 279 8 4 |
| 279 29 6 | 8 4 3 | 5 129 1279 |
+-------------+----------+--------------+
| 27 2456 9 | 1 36 8 | 237 245 237 |
| 18 14 3 | 7 5 2 | 6 49 89 |
| 278 256* 57 | 9 36 4 | 1 25 2378 |
+-------------+----------+--------------+
| 5 3 2 | 4 9 1 | 8 7 6 |
| 6 19 4 | 3 8 7 | 29 129 5 |
| 19 7 8 | 56 2 56 | 4 3 19 |
+-------------+----------+--------------+
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At this point in the puzzle, using 'HINT' results in r6c2 = '6'.
Is it possible to learn the reasoning behind the clue given by 'HINT'?
Ema Nymton
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Apr 17, 2011 1:34 pm Post subject: |
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Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to!
But in row 4 you have a naked triple 237 which makes r4c5=6 and so r6c2=6.. |
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Pat
Joined: 23 Feb 2010
Posts: 207
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| Posted: Sun Apr 17, 2011 2:10 pm Post subject: |
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or i'd say,
in r4 there's a "hidden" duo {4,5}
-- which solves the 6 for c2 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Apr 17, 2011 4:06 pm Post subject: |
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The XY-Wing also works as an 891, pivoted in r5c9; r9c1<>1.
| Quote: | | Ema, I don't know if the "hint" button gives you a "logical solver" next step or just picks a cell to give you the answer to! |
Peter, the hints are based on a logical step. |
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