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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Apr 05, 2010 5:29 pm Post subject: Puzzle 10/04/05 (C) |
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| Code: | +-----------------------+
| . . 3 | 7 . 5 | 6 8 4 |
| . . . | . . . | . . . |
| 6 . 4 | . . 3 | 5 . . |
|-------+-------+-------|
| 3 . . | . . 1 | . . . |
| . . . | . 6 . | . 4 . |
| 9 . 5 | 4 . 7 | 1 . 3 |
|-------+-------+-------|
| 2 . 1 | . . 6 | 4 . . |
| 5 . . | . 7 . | . . 6 |
| 4 . . | . . 2 | . 1 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Tue Apr 06, 2010 6:39 am Post subject: |
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| Quote: | | A <289> xy wing in blocks 2 and 5. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Apr 06, 2010 12:37 pm Post subject: |
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Ditto.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Apr 07, 2010 4:48 pm Post subject: |
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| Another ditto. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Apr 07, 2010 5:13 pm Post subject: |
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| Hmmm! I almost always have X-Wing before XY-Wing in my testing of a puzzle for solutions. Thus, I expected everyone to encounter several X-Wings before the XY-Wing. As it turns out, my final "static" pass did find the XY-Wing occurring at the same place as the first X-Wing, but I didn't note the significance. Sorry! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Apr 07, 2010 5:21 pm Post subject: |
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No need. Always good to have a crack at your puzzles.
So does it go in as another tweak into your solver/generator Danny ? |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Apr 07, 2010 10:10 pm Post subject: |
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| Mogulmeister wrote: | No need. Always good to have a crack at your puzzles.
So does it go in as another tweak into your solver/generator Danny ? |
My puzzle generator is a klunky thing that's part of my original solver. That solver was very limited in the number of techniques it recognized and, thus, could be incorporated into the puzzle generator.
I did what I could to "tweak" the puzzle generator to generate puzzles with a high probability of being suitable for posting. Then, I run the puzzles through my latest solver to get a "ballpark" idea of which puzzles might be worthwhile based on one ordering of techniques. After using this pass to sift through the puzzles, I run the remaining puzzles four more times through my current solver using different technique ordering to try and eliminate puzzles that only need a single technique to crack them. Finally, I make a fifth pass to see which techniques are present after basics.
Ironically, most of the puzzles produced by my generator are too easy or too hard. The problem lies in the way it takes a solved grid and then works backwards to construct a puzzle that doesn't need more than a specified set of techniques to solve it. I continue to "tweak" the logic, but seem to be missing something fundamental. 
Unfortunately, my eyes sometimes cross during this whole process (because I'm tired of manually sifting through solutions) and a puzzle slips through that can be cracked with one step. Also, I sometimes don't realize that a combination of steps are critical and rely upon each other. The screams of "Foul" from those working these puzzles let me know. 
Regards, Danny
BTW: All of Friday's puzzles will be missing <8> in the givens because my grand-niece stole them for her birthday cake.  |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Apr 07, 2010 11:12 pm Post subject: |
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