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crunched
Joined: 05 Feb 2008
Posts: 168
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 Posted: Thu Aug 13, 2009 4:20 am Post subject: Aug 13 VH |
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Here is the grid after basics.
| Quote: | Below is how I solved it
xyz wing 3-4-9, taking out the 3 in c3r9 |
| Code: |
+-------------+-------------+----------+
| 57 9 4 | 136 136 8 | 2 36 57 |
| 37 6 8 | 34 2 5 | 9 1 47 |
| 2 1 35 | 346 7 9 | 8 36 45 |
+-------------+-------------+----------+
| 6 45 9 | 7 145 12 | 3 25 8 |
| 1 345 2 | 39 8 34 | 7 59 6 |
| 8 35 7 | 369 356 26 | 4 259 1 |
+-------------+-------------+----------+
| 34 7 1 | 5 9 34 | 6 8 2 |
| 359 2 356 | 8 36 7 | 1 4 39 |
| 349 8 36 | 2 1346 16 | 5 7 39 |
+-------------+-------------+----------+
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Play this puzzle online at the Daily Sudoku site[/quote]
Last edited by crunched on Thu Aug 13, 2009 5:41 am; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Aug 13, 2009 5:12 am Post subject: |
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An alternative solution is:
| Quote: | | W-Wing on the 36s in boxes 78, connected by the 3s in the same boxes |
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tippwell
Joined: 19 Sep 2007
Posts: 9
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| Posted: Thu Aug 13, 2009 6:09 am Post subject: |
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I didn't find Crunched's xyz wing without his help. I had noticed that R1C4 contained the only 1 in col 4, and this led to a 36 pair in col5 which gave some more simplification in rows 6 and 9.
XYZ wings are my next resource after xy and x wings, but I've found recent ones tricky - need more, more, more ..... |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Aug 13, 2009 12:48 pm Post subject: |
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| There is a swordfish on 3 which makes the xyz-wing into an xy_wing. Why use two steps when one will do? |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Thu Aug 13, 2009 9:09 pm Post subject: |
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| arkietech wrote: | | There is a swordfish on 3 which makes the xyz-wing into an xy_wing. Why use two steps when one will do? |
Tose poor 3s inr89c1! A swordfis, jellyfish and a UR all are primed to eradicate them!
As for te puzzle, a w-wing makes te same elimination as te mentioned xyz wing. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Aug 14, 2009 7:05 pm Post subject: |
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Basics are not complete in the grid posted above. You can get to here: | Code: | +-------------+-------------+-------------+
| 57 9 4 | 1 36 8 | 2 36 57 |
| 37 6 8 | 34 2 5 | 9 1 47 |
| 2 1 35 | 346 7 9 | 8 36 45 |
+-------------+-------------+-------------+
| 6 45 9 | 7 14 12 | 3 25 8 |
| 1 45 2 | 39 8 34 | 7 59 6 |
| 8 3 7 | 69 5 26 | 4 29 1 |
+-------------+-------------+-------------+
|-34 7 1 | 5 9 34d | 6 8 2 |
| 359 2 356 | 8 36 7 | 1 4 39 |
| 349 8 36a | 2 14b 16c | 5 7 39 |
+-------------+-------------+-------------+ |
I used the 4-cell chain (extended XY-wing) abcd to take out <3> in R7C1.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 15, 2009 3:56 am Post subject: |
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| Quote: | | I used the 4-cell chain (extended XY-wing) abcd to take out <3> in R7C1. |
Keith,strictly from a terminology standpoint, what makes that an Extended XY-Wing? I see either an XY-Chain or an XY-Wing using a pseudo cell. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Sat Aug 15, 2009 3:57 am Post subject: |
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Keith:
Methinks you have b & c reversed.
| keith wrote: | Basics are not complete in the grid posted above. You can get to here: | Code: | +-------------+-------------+-------------+
| 57 9 4 | 1 36 8 | 2 36 57 |
| 37 6 8 | 34 2 5 | 9 1 47 |
| 2 1 35 | 346 7 9 | 8 36 45 |
+-------------+-------------+-------------+
| 6 45 9 | 7 14 12 | 3 25 8 |
| 1 45 2 | 39 8 34 | 7 59 6 |
| 8 3 7 | 69 5 26 | 4 29 1 |
+-------------+-------------+-------------+
|-34 7 1 | 5 9 34d | 6 8 2 |
| 359 2 356 | 8 36 7 | 1 4 39 |
| 349 8 36a | 2 14b 16c | 5 7 39 |
+-------------+-------------+-------------+ |
I used the 4-cell chain (extended XY-wing) abcd to take out <3> in R7C1.
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 15, 2009 6:41 am Post subject: |
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| Marty R. wrote: | | Quote: | | I used the 4-cell chain (extended XY-wing) abcd to take out <3> in R7C1. |
Keith,strictly from a terminology standpoint, what makes that an Extended XY-Wing? I see either an XY-Chain or an XY-Wing using a pseudo cell. |
Marty,
Yes. Some have called the 4-cell chain with a pseudo-cell an extended XY-wing.
If an XY-wing is XZ-XY-YZ, then I usually think of an extended wing as something like XZ-XY-XY-XY-YZ.
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Aug 15, 2009 6:43 am Post subject: |
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| crunched wrote: | Keith:
Methinks you have b & c reversed.
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crunched,
You are correct!
Keith |
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