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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Nov 10, 2008 8:03 am Post subject: VH: Set A Puzzle 29 |
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| 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 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Nov 10, 2008 3:46 pm Post subject: |
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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 |
*-----------------------------------------------------------*
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Play this puzzle online
| Quote: | | Find the 578 xy-wing |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Nov 10, 2008 3:59 pm Post subject: |
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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: 3854
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| Posted: Mon Nov 10, 2008 5:35 pm Post subject: |
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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: 5770
Location: Rochester, NY, USA
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| Posted: Tue Nov 11, 2008 1:28 am Post subject: |
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| This one drove me nuts. I used a half-dozen different techniques before I had to use my Medusa crutch. |
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