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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Fri Jan 11, 2008 7:55 am Post subject: Jan. 11 vh |
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Happy New Year ! (I know, I know, the new year has been around for a while, but I haven't ...  )
After basics, look for an x-wing (9) which exposes an xy-wing (16-46-14 in the upper right area). There is another xy-wing (36-39-69, again in the upper right) which solves the puzzle.
I did not use the UR (36) that had been staring in my face for some time, so maybe that would have been more direct. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Fri Jan 11, 2008 9:25 am Post subject: |
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There is a 4-cell xy-chain (A,B,C,D) present in the grid that solves the puzzle in one fell swoop. Both pincer ends in R3C2(A) and R1C9(D) can see digit <6> in R1C2, so <6> can be eliminated in R1C2.
The 4-cell xy-chain : [69-93-34-46]
| Code: |
+--------------------------+--------------------------+--------------------------+
| 78 5-[6] 78 | 356 9 1 | 2 C 34 D 46 |
| 25 3 29 | 56 8 4 | 169 7 169 |
| 1 A 69 4 | 36 7 2 | 8 B 39 5 |
+--------------------------+--------------------------+--------------------------+
| 9 78 3 | 48 2 57 | 145 6 14 |
| 6 4 5 | 1 3 9 | 7 2 8 |
| 78 2 1 | 48 6 57 | 459 49 3 |
+--------------------------+--------------------------+--------------------------+
| 4 78 78 | 9 1 36 | 36 5 2 |
| 23 1 29 | 7 5 36 | 3469 8 469 |
| 35 59 6 | 2 4 8 | 39 1 7 |
+--------------------------+--------------------------+--------------------------+ |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Fri Jan 11, 2008 11:09 am Post subject: |
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| Code: | +--------------------------+--------------------------+--------------------------+
|#78 56 #78 | 356 9 1 | 2 34 46 |
| 25 3 29 | 56 8 4 | 169 7 169 |
| 1 69 4 | 36 7 2 | 8 39 5 |
+--------------------------+--------------------------+--------------------------+
| 9 #78 3 |#48 2 #57 |#145 6 14 |
| 6 4 5 | 1 3 9 | 7 2 8 |
|#78 2 1 |#48 6 #57 |#459 49 3 |
+--------------------------+--------------------------+--------------------------+
| 4 #78 #78 | 9 1 36 | 36 5 2 |
| 23 1 29 | 7 5 36 | 3469 8 469 |
| 35 59 6 | 2 4 8 | 39 1 7 |
+--------------------------+--------------------------+--------------------------+
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I like this deadly pattern (with 45 in r46c7), which allows to eliminate 4 from r46c7, but it does not solve the puzzle (neither the 36 UR). |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Fri Jan 11, 2008 11:53 am Post subject: W Wing solution |
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| Code: |
+------------+----------+-------------+
| 578 56 78 | 356 9 1 | 2 34 46 |
| 25 3 29 | 56 8 4 | 169 7 169 |
| 1 69 4 | 36 7 2 | 8 39 5 |
+------------+----------+-------------+
| 9 78 3 | 458 2 57 | 145 6 14 |
| 6 4 5 | 1 3 9 | 7 2 8 |
| 78 2 1 | 458 6 57 | 459 49 3 |
+------------+----------+-------------+
| 4 78 78 | 9 1 36 | 36 5 2 |
| 23 1 29 | 7 5 36 | 3469 8 469 |
| 35 59 6 | 2 4 8 | 39 1 7 |
+------------+----------+-------------+
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[url=http://www.dailysudoku.com/sudoku/play.shtml?p=578: 56:78:356:9:1:2:34:46:25:3:29:56:8:4:169:7:169:1:69:4:36:7:2:8:39:5:9:78:3:458:2:57:145:6:14:6:4:5:1:3:9:7:2:8:78:2:1:458:6:57:459:49:3:4:78:78:9:1:36:36:5:2:23:1:29:7:5:36:3469:8:469:35:59:6:2:4:8:39:1:7:]Play this puzzle online[/url] at the Daily Sudoku site
Having reached this point ( using draw/play sweep and correcting only r1c2) :-
I reckon the W-Wing 56 in Boxes 1 and 2 operating on row 3 solves it! |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Fri Jan 11, 2008 3:58 pm Post subject: |
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| Took me forever to get through the basics - couldn't even see the naked pairs. Is that a sign of old age? Eventually used the same UR (36) and x-wing on 9's that Nataraj mentioned. But still needed an xyz-wing for <169> (C79) for the coup-de-grace. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Jan 11, 2008 6:22 pm Post subject: |
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could someone (George or a moderator) please edit George Woods' post and insert one or two blanks into this line "56:78:356:9:1:2:34..." so that the text will fit on my screen again ?
pleeeze ...
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Sat Jan 12, 2008 12:15 am Post subject: W Wing solution |
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| nataraj wrote: | could someone (George or a moderator) please edit George Woods' post and insert one or two blanks into this line "56:78:356:9:1:2:34..." so that the text will fit on my screen again ?
pleeeze ...
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This text should have been suppressed _ being the code to generate the green matrix - and adds nothing to the substance of the message!
If someone could tell me how to get (as once I used to) a copy from "asci" in draw/play that ends up with an active "play this ...." I would be very grateful |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jan 12, 2008 1:12 am Post subject: |
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| Quote: | If someone could tell me how to get (as once I used to) a copy from "asci" in draw/play that ends up with an active "play this ...." I would be very grateful
_________________
George woods |
1) Click Ascii to the right of the grid
2) Click in the middle part of the new window so it gets highlighted
3) Copy it (Ctrl+C)
4) Paste it (Ctrl+V) into the message box
Hope this helps.
| Code: |
+------------------+------------------+------------------+
| 578 45678 478 | 356 9 1 | 2 34 46 |
| 125 3 129 | 56 8 4 | 169 7 169 |
| 178 46789 14789 | 36 367 2 | 134689 1349 5 |
+------------------+------------------+------------------+
| 9 478 13478 | 13458 1237 3578 | 145 6 124 |
| 6 4 5 | 134 123 39 | 7 1249 8 |
| 178 2 1478 | 14568 167 56789 | 1459 1459 3 |
+------------------+------------------+------------------+
| 4 578 2378 | 9 136 368 | 1356 1235 1267 |
| 23 1 239 | 7 5 36 | 3469 8 2469 |
| 3578 5789 6 | 2 4 38 | 1359 1359 179 |
+------------------+------------------+------------------+
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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: Sat Jan 12, 2008 6:29 am Post subject: |
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put me down for:
the UR on 36, takes out {3,6} in r8c7
then x-wing on 9 takes out a couple nines, most importantly the 9 in r2c7
which opened the xy-wing pincers in r2c7 and r4c9 taking out 1 in r2c9, solves the puzzle.
and I like johan's solution. very nice
the number of {7,8} pairs was ridiculous
happy new year nataraj,
Norm |
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ledzepxx
Joined: 03 Jun 2008
Posts: 3
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| Posted: Tue Jun 03, 2008 12:54 pm Post subject: |
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hey everyone, first time posting here
been going through old VHs, trying to improve
anyway, i'm stuck at this stage
could someone point out where to go from here?
| Code: |
+--------------+-----------+---------------+
| 578 56 478 | 356 9 1 | 2 34 46 |
| 25 3 29 | 56 8 4 | 169 7 169 |
| 1 69 49 | 36 7 2 | 8 349 5 |
+--------------+-----------+---------------+
| 9 78 3 | 48 2 57 | 145 6 14 |
| 6 4 5 | 1 3 9 | 7 2 8 |
| 78 2 1 | 48 6 57 | 459 49 3 |
+--------------+-----------+---------------+
| 4 78 278 | 9 1 368 | 36 5 267 |
| 23 1 29 | 7 5 36 | 3469 8 2469 |
| 3578 59 6 | 2 4 38 | 39 1 79 |
+--------------+-----------+---------------+
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Tue Jun 03, 2008 1:32 pm Post subject: |
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Welcome ledzepxx. You didn't get far enough with basics. Note the pair of 29's in C3 - that will get you to the UR mentioned above.
Good Luck,
Craig |
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ledzepxx
Joined: 03 Jun 2008
Posts: 3
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| Posted: Tue Jun 03, 2008 2:06 pm Post subject: |
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| cgordon wrote: | Welcome ledzepxx. You didn't get far enough with basics. Note the pair of 29's in C3 - that will get you to the UR mentioned above.
Good Luck,
Craig |
thanks
could you explain UR too  |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Tue Jun 03, 2008 3:30 pm Post subject: |
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See the four 36’s in R78 C67 - you can remove the 36 in R8C7. I’m not the guy to explain why – so if you haven’t gotten into URs I would recommend visiting
http://www.sudoku.com/boards/viewtopic.php?p=29105#29105
written by Keith. There are I believe 6 different UR types and their logic is related to unique solutions and “Deadly Patterns” Just remember (cos I often forget) the pattern has to be in two parallel boxes – not four.
| Code: |
+-------+--------+---------+
| . . . | . . 36 | 36 . .|
| . . . | . . 36 | 3649. .|
| . . . | . . . | . . .|
+-------+--------+---------+
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| Code: |
+-------+--------+---------+
| . . . | . . 36 | 36 . .|
| . . . | . . 36 | 49 . .|
| . . . | . . . | . . .|
+-------+--------+---------+
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