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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Fri Mar 19, 2010 11:41 pm Post subject: March 20 VH |
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Two XY-Wings
1) XY-Wing 45 15 14 eliminating 4 in r46c2 leading to
2) XY-Wing 34 37 47 eliminating 4 in r3c9 solving the puzzle. |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Fri Mar 19, 2010 11:53 pm Post subject: or a single w wing |
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| 34s acting on 4s in row 1eliminates 3 at r6c2 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Mar 20, 2010 2:58 am Post subject: |
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Finned xy-wing 3-47 with vertex 37 in r6c2, pincer 34 in r3c2, pincer 47 in r6c9 and fin 4 in r6c2 also does the deed.
If the xy-wing is true, r3c9<>4
If the fin is true: (4)r6c2 - r1c2 = r1c7; r3c9<>4.
Both conditions delete 4 in r3c9 to complete the puzzle.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Mar 20, 2010 3:52 am Post subject: |
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This was my first one in ages that I couldn't find a one-stepper.
XY-Wing (154)
M-Wing (37) |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Mar 20, 2010 7:12 am Post subject: |
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I found Clement's solution after only a few two-candidate pencil marks.
George's W-wing is a one-stepper.
Keith |
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Ema Nymton
Joined: 17 Apr 2009
Posts: 89
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| Posted: Wed Mar 24, 2010 9:08 am Post subject: |
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No solution ...
| Code: |
+---------------+------------+-----------------+
| 9 45 7 | 8 6 1 | 45 2 3 |
| 135 8 2 | 4 379 79 | 6 19 159 |
| 1346 34 136 | 5 39 2 | 8 7 149 |
+---------------+------------+-----------------+
| 134 3479 139 | 37 5 8 | 2 1349 6 |
| 8 6 139 | 37 2 4 | 139 5 179 |
| 2 347 5 | 9 1 6 | 34 8 47 |
+---------------+------------+-----------------+
| 35 * 2 8 | 6 479 579 | 13459 1349 1459 |
| 56 59 4 | 1 8 3 | 7 69 2 |
| 7 1 369 | 2 49 59 | 3459 3469 8 |
+---------------+------------+-----------------+
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Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?
Ema Nymton
~@:o|
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Mar 24, 2010 12:21 pm Post subject: |
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| Ema Nymton wrote: |
Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?
Ema Nymton
~@:o|
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The "5" in row 8 must be in cell r8c1 or r8c2.
Therefore r7c1 cannot be "5" |
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Ema Nymton
Joined: 17 Apr 2009
Posts: 89
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| Posted: Wed Mar 24, 2010 5:58 pm Post subject: |
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| nataraj wrote: | | Ema Nymton wrote: |
Draw/Play gives a hint of '3' at r7c1.
Is it possible to show the way?
Ema Nymton
~@:o|
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The "5" in row 8 must be in cell r8c1 or r8c2.
Therefore r7c1 cannot be "5" |
Thank you. I spent days looking and not seeing.
Ema Nymton
~@:o)
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