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Nov 3 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Fri Nov 02, 2012 10:39 pm    Post subject: Nov 3 VH Reply with quote
Code:

+------------+---------+-----------+
| 467 46 9   | 47 8 5  | 1   2  3  |
| 8   2  37  | 37 9 1  | 46  46 5  |
| 1   5  34  | 34 2 6  | 8   7  9  |
+------------+---------+-----------+
| 9   *46 247 | 12 5 48 | 267 3  18 |
| 2-47 3  5   | 12 6 48 | 27  9  18 |
| #26  1  8   | 9  7 3  | 256 56 4  |
+------------+---------+-----------+
| 3   7  24  | 5  1 29 | 49  8  6  |
| *24  8  1   | 6  3 29 | 459 45 7  |
| 5   9  6   | 8  4 7  | 3   1  2  |
+------------+---------+-----------+
XY-Wing 24-26-46 pivoted in r6c1; r5c1<>4 solves it.
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TerenceF



Joined: 21 Dec 2007
Posts: 26
Location: Takapuna, NZ
PostPosted: Tue Nov 06, 2012 8:23 am    Post subject: Re: Nov 3 VH Reply with quote
Clement wrote:
Code:

+------------+---------+-----------+
| 467 46 9   | 47 8 5  | 1   2  3  |
| 8   2  37  | 37 9 1  | 46  46 5  |
| 1   5  34  | 34 2 6  | 8   7  9  |
+------------+---------+-----------+
| 9   *46 247 | 12 5 48 | 267 3  18 |
| 2-47 3  5   | 12 6 48 | 27  9  18 |
| #26  1  8   | 9  7 3  | 256 56 4  |
+------------+---------+-----------+
| 3   7  24  | 5  1 29 | 49  8  6  |
| *24  8  1   | 6  3 29 | 459 45 7  |
| 5   9  6   | 8  4 7  | 3   1  2  |
+------------+---------+-----------+
XY-Wing 24-26-46 pivoted in r6c1; r5c1<>4 solves it.


Very neat Clement: similarly, inspecting r6, if r6c1=2 then r5c1<>2 and r4c3<>2
Conversely if r6c1<>2 then r6c7=2 so r5c7=7 so r4c7=6 so r4c2=4 so r4c6=8 so r4c9=1 so r4c4=2 so again, R4C3<>2

So r7c3=2 and from there it drops out.

Don't remember what that is called, it's been a while ...
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