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dldcamp
Joined: 29 May 2007
Posts: 15
Location: Florida
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 Posted: Sun Jun 03, 2007 12:43 pm Post subject: Jan 26 2007 VH |
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Just when we think we're getting it.... Anyway, the next hint is a 7 in r1c6. We can't find the logic...Which doesn't mean much!
| Code: |
+---------------+------------------+------------------+
| 4 15 579 | 3 8 17 | 6 2 159 |
| 238 1256 3578 | 1257 12567 9 | 1345 345 135 |
| 239 1256 359 | 4 1256 126 | 1359 7 8 |
+---------------+------------------+------------------+
| 6 4 89 | 58 59 3 | 2 1 7 |
| 89 3 1 | 2578 4 278 | 589 6 59 |
| 5 7 2 | 6 19 18 | 389 389 4 |
+---------------+------------------+------------------+
| 1 8 34 | 27 267 5 | 3479 349 369 |
| 23 25 345 | 9 1267 12678 | 134578 3458 1356 |
| 7 9 6 | 18 3 4 | 158 58 2 |
+---------------+------------------+------------------+
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Play this puzzle online at the Daily Sudoku site |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Jun 03, 2007 1:12 pm Post subject: |
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There is a pair in B5. There is a quad in R2. This will reveal an XY-wing that makes the elimination.
There is much you can do to simplify the candidate lists.
Keith |
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dldcamp
Joined: 29 May 2007
Posts: 15
Location: Florida
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| Posted: Sun Jun 03, 2007 6:33 pm Post subject: |
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| I had already found the pair and quad. But, where is the XY wing? This is new to me and I still haven't found one yet on my own. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Jun 04, 2007 5:00 am Post subject: |
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After you simplify the candidates:
| Code: | +-------------------+-------------------+-------------------+
| 4 15 579 | 3 8 17# | 6 2 159 |
| 28 26 78 | 15@ 267 9 | 1345 345 135 |
| 239 1256 359 | 4 1256 126 | 159 7 8 |
+-------------------+-------------------+-------------------+
| 6 4 89 | 58@ 59 3 | 2 1 7 |
| 89 3 1 | 27 4 27 | 589 6 59 |
| 5 7 2 | 6 19 18@ | 389 389 4 |
+-------------------+-------------------+-------------------+
| 1 8 34 | 27 267 5 | 3479 349 369 |
| 23 25 345 | 9 167 1678 | 13478 348 136 |
| 7 9 6 | 18 3 4 | 158 58 2 |
+-------------------+-------------------+-------------------+ |
The XY-wing 15-58-18 (@) eliminates <1> in R1C6 (#).
In my interpretation, an XY-wing is a triple (ab, ac, bc) spread across more than one element (row, column, box). I do not find them easy.
Keith |
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dldcamp
Joined: 29 May 2007
Posts: 15
Location: Florida
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| Posted: Sun Jun 10, 2007 1:03 pm Post subject: Still confused |
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| I have a 15 (C4,R2), 58(C4,R4), and 18(C4, R9). But, I can't find the w-y wing. What boxes are the 15, 58, 18 in? And, which is the pivot? |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sun Jun 10, 2007 7:46 pm Post subject: Two <1>s eliminated |
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In Keith's XY-wing, <1> is eliminated from both R1C6 and R3C6.
dldcamp: The 18 is in R6C6 (marked @). The logic:
R4C4 is either <5> or <8>.
If R4C4 is <5>, R2C4 is <1>.
If R4C4 is <8>, R6C6 is <1>.
Thus, either R2C4 is <1> or R6C6 is <1>.
Any cell that can "see" both of these cells cannot be <1>. |
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