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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Mon Mar 23, 2009 7:50 am Post subject: March 23 vh |
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A two+ coffee puzzle.
Hint: Two steps: x-wing (3) cols 2,7 opens an xy-wing 26-16-12 col 7 / box 9 |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Mar 23, 2009 2:03 pm Post subject: |
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| Yes. Same solution for me - but it took me more than two coffees - almost into Miller time. A veritable challenge! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Mar 23, 2009 3:57 pm Post subject: |
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| A slightly convoluted XY-Chain exposed a puzzle-finishing XY-Wing. |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Mon Mar 23, 2009 5:03 pm Post subject: Daily Sudoku: Mon 23-Mar-2009 VH |
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| XY-Wing 126 with Pivot {16}r7c7 solves the puzzle. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Mar 23, 2009 6:58 pm Post subject: |
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| cgordon wrote: | | took me more than two coffees - almost into Miller time. ... |
 my computer says time of post 2pm UTC or roughly 9am EST
Now that makes me wonder about your current timezone ... Sláinte! 干杯 (gan bei) !  |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Mon Mar 23, 2009 7:42 pm Post subject: |
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| nataraj wrote: | | cgordon wrote: | | took me more than two coffees - almost into Miller time. ... |
my computer says time of post 2pm UTC or roughly 9am EST
Now that makes me wonder about your current timezone ... Sláinte! Prost! לְחַיִּים ! 干杯 (gan bei) ! |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Mar 23, 2009 8:25 pm Post subject: |
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| Quote: | | Now that makes me wonder about your current timezone ... Sláinte! Prost! |
I might start early but I always stop after two (2:30 at the latest.)  |
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Julie Dachs
Joined: 03 Jun 2006
Posts: 2
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| Posted: Mon Mar 23, 2009 10:52 pm Post subject: |
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| I'm assuming that you have to eliminate the 3 in r8c9 in order to set up the the 126 xy-wing that solves the puzzle. But how do you do that? What am I missing? |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Mar 23, 2009 11:13 pm Post subject: |
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After basics:
| Code: | +----------------+----------------+----------------+
| 147 57 9 | 3 8 6 | 15 2 14 |
| 134 6 2 | 5 14 7 | 8 9 134 |
| 1348 35 348 | 14 9 2 | 135 6 7 |
+----------------+----------------+----------------+
| 5 2 7 | 6 3 1 | 9 4 8 |
| 38 9 38 | 7 5 4 | 26 1 26 |
| 6 4 1 | 8 2 9 | 7 3 5 |
+----------------+----------------+----------------+
| 2 8 45 | 14 67 3 | 16 57 9 |
| 347 37 6 | 9 14 5 | 123 8 123 |
| 9 1 35 | 2 67 8 | 4 57 36 |
+----------------+----------------+----------------+ |
I do not see an XY-wing. There is a type-3 UR taking out <1> in R3C7 (which you don't need), and there is an X-wing on <3>.
After the X-wing, there is an XY-wing 1-26.
Keith
Last edited by keith on Tue Mar 24, 2009 2:03 am; edited 1 time in total |
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Julie Dachs
Joined: 03 Jun 2006
Posts: 2
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| Posted: Tue Mar 24, 2009 12:02 am Post subject: 3/23 Very hard |
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Thanks Keith,
The x-wing on 3 did the trick! |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Tue Mar 24, 2009 12:53 am Post subject: |
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I had the same solution as Keith, et al. But keith had more numbers removed from basics. I did not get as many "basic" numbers removed.
By the way, there is a 3-5-7 xyz wing in boxes 4 & 7.
Oh, now I see it. A box line reduction on 5 in c3/box 7
| Code: |
+---------------+-----------+------------+
| 1457 57 9 | 3 8 6 | 15 2 14 |
| 134 6 2 | 5 14 7 | 8 9 134 |
| 13458 35 3458 | 14 9 2 | 135 6 7 |
+---------------+-----------+------------+
| 57 2 57 | 6 3 1 | 9 4 8 |
| 38 9 38 | 7 5 4 | 26 1 26 |
| 6 4 1 | 8 2 9 | 7 3 5 |
+---------------+-----------+------------+
| 2 8 457 | 14 1467 3 | 16 57 169 |
| 347 37 6 | 9 147 5 | 123 8 123 |
| 9 1 357 | 2 67 8 | 4 57 36 |
+---------------+-----------+------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Mar 24, 2009 1:13 am Post subject: |
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| Code: | .------------------.------------------.------------------.
| 147 *57 9 | 3 8 6 |*15 2 14 |
| 134 6 2 | 5 14 7 | 8 9 134 |
| 1348 35 348 | 14 9 2 | 135 6 7 |
:------------------+------------------+------------------:
| 5 2 7 | 6 3 1 | 9 4 8 |
| 38 9 38 | 7 5 4 | 26 1 26 |
| 6 4 1 | 8 2 9 | 7 3 5 |
:------------------+------------------+------------------:
| 2 8 45 | 14 67 3 |*16 57 9 |
| 347 *37 6 | 9 14 5 |12-3 8 123 |
| 9 1 35 | 2 67 8 | 4 57 *36 |
'------------------'------------------'------------------' |
xy-chain does it in one.
starting in r8c2 ...
37-75-51-16-63
removes 3 from r8c7 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Mar 24, 2009 1:41 pm Post subject: |
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| storm_norm wrote: | | Code: | .------------------.------------------.------------------.
| 147 *57 9 | 3 8 6 |*15 2 14 |
| 134 6 2 | 5 14 7 | 8 9 134 |
| 1348 35 348 | 14 9 2 | 135 6 7 |
:------------------+------------------+------------------:
| 5 2 7 | 6 3 1 | 9 4 8 |
| 38 9 38 | 7 5 4 | 26 1 26 |
| 6 4 1 | 8 2 9 | 7 3 5 |
:------------------+------------------+------------------:
| 2 8 45 | 14 67 3 |*16 57 9 |
| 347 *37 6 | 9 14 5 |12-3 8 123 |
| 9 1 35 | 2 67 8 | 4 57 *36 |
'------------------'------------------'------------------' |
xy-chain does it in one.
starting in r8c2 ...
37-75-51-16-63
removes 3 from r8c7 |
I found the same xy-chain. It also deletes <3> from r8c9.
Ted |
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