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andras
Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales
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 Posted: Sat Nov 17, 2007 10:31 am Post subject: Nov 17 VH |
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An xy-wing and a Swordfish solved it for me. But are there any shorter routes that I missed?
John |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Sat Nov 17, 2007 11:23 am Post subject: |
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| Quote: | But are there any shorter routes that I missed?
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There is an xy-wing with pivot in R8C5, eliminating three <7>'s, that
solves the puzzle in one step.
The grid after basics :
| Code: |
+---------------+-------------+----------------+
| 9 247 257 | 6 128 38 | 34578 3578 12 |
| 2567 8 2567 | 13 129 4 | 357 3567 129 |
| 246 3 1 | 7 5 89 | 48 68 29 |
+---------------+-------------+----------------+
| 3 67 9 | 8 67 1 | 2 4 5 |
| 1 267 27 | 4 367 5 | 37 9 8 |
| 8 5 4 | 9 37 2 | 1 37 6 |
+---------------+-------------+----------------+
| 67 1 678 | 5 4 78 | 9 2 3 |
| 57 79 3578 | 2 89 3789 | 6 1 4 |
| 24 249 23 | 13 19 6 | 58 58 7 |
+---------------+-------------+----------------+
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Play this puzzle online at the Daily Sudoku site |
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andras
Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales
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| Posted: Sat Nov 17, 2007 1:52 pm Post subject: |
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Hmm - saw (and used) the xy, but must have missed one of the 7s. 
Must try harder!
John |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Nov 17, 2007 2:18 pm Post subject: |
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I also noticed the XY at R8c5 but at that time, I only had a 7 at r8c6 to eliminate which still solved the puzzle for me. I don't recall how I eliminated the other 7(s) so I am going to solve it again.
Ted |
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jdomhoc
Joined: 13 May 2007
Posts: 2
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| Posted: Mon Nov 19, 2007 11:57 am Post subject: nov 17 |
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I found the XYWing but I cna not see how to follow
Could you give me an idea,pls?
________
buy vaporizer
Last edited by jdomhoc on Wed Feb 02, 2011 5:02 pm; edited 1 time in total |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Nov 19, 2007 2:01 pm Post subject: |
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At this point the XY-wing @ takes out three <7>'s:
| Code: | +-------------------+-------------------+-------------------+
| 9 247 257 | 6 128 38 | 34578 3578 12 |
| 2567 8 2567 | 13 129 4 | 357 3567 129 |
| 246 3 1 | 7 5 89 | 48 68 29 |
+-------------------+-------------------+-------------------+
| 3 67# 9 | 8 67# 1 | 2 4 5 |
| 1 26-7# 27 | 4 36-7# 5 | 37 9 8 |
| 8 5 4 | 9 37 2 | 1 37 6 |
+-------------------+-------------------+-------------------+
| 6-7 1 6-78 | 5 4 78@ | 9 2 3 |
| 57 79@ 3578 | 2 89@ 3-789 | 6 1 4 |
| 24 249 23 | 13 19 6 | 58 58 7 |
+-------------------+-------------------+-------------------+
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Note there is also a UR which takes out another couple of <7>'s. In any event, look for the pair <24> in C1 and then a hidden triple <357> in R2.
Keith |
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