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VH: Set A Puzzle 29

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Nov 10, 2008 8:03 am    Post subject: VH: Set A Puzzle 29 Reply with quote

Code:
 +-----------------------+
 | 7 . . | 4 . . | . . 9 |
 | . . . | . . . | 6 . . |
 | . . . | 8 . 5 | . . . |
 |-------+-------+-------|
 | 6 . 2 | . . . | . 4 3 |
 | . . . | . 2 . | 8 . . |
 | . . 8 | . . 4 | 9 . 6 |
 |-------+-------+-------|
 | . 3 . | . 4 1 | . 6 . |
 | . . . | 3 . . | 1 . . |
 | 8 . . | 7 . 9 | . . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1687
Location: Northwest Arkansas USA

PostPosted: Mon Nov 10, 2008 3:46 pm    Post subject: Reply with quote

after an early x-wing I got to here
Code:
 *-----------------------------------------------------------*
 | 7     258   35    | 4     1     6     | 23    58    9     |
 | 1459  4589  3459  | 29    379   27    | 6     58    147   |
 | 1249  49    6     | 8     379   5     | 34    17    1247  |
 |-------------------+-------------------+-------------------|
 | 6     17    2     | 19    789   78    | 5     4     3     |
 | 459   459   459   | 6     2     3     | 8     17    17    |
 | 3     17    8     | 15    57    4     | 9     2     6     |
 |-------------------+-------------------+-------------------|
 | 259   3     59    | 25    4     1     | 7     6     8     |
 | 245   6     7     | 3     58    28    | 1     9     24    |
 | 8     24    1     | 7     6     9     | 24    3     5     |
 *-----------------------------------------------------------*
Play this puzzle online
Quote:
Find the 578 xy-wing
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Nov 10, 2008 3:59 pm    Post subject: Reply with quote

x-wing on 2
Er on 3
ER on 2
Type 4 UR (58)
x wing on 9

then I gave up and used the Off F method (off the forum)
finished after the 578 xy-wing hint

For me, xy-wings are harder to spot than all the other "pattern" methods
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Nov 10, 2008 5:35 pm    Post subject: Reply with quote

When an XY-Wing is needed early in a solution, then it's often easier to find because there are fewer bivalue cells to sift through. When an XY-Wing is needed late in a solution, then it's often a nightmare to sift through all of the possible combinations.

Unfortunately for you, my puzzle generator skews its output to where Singles occur first and other techniques occur near the end. Once I get around to writing a new puzzle generator, this (hopefully) won't be the case.
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Tue Nov 11, 2008 1:28 am    Post subject: Reply with quote

This one drove me nuts. I used a half-dozen different techniques before I had to use my Medusa crutch.
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