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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon May 17, 2010 6:41 pm Post subject: Puzzle 10/05/17: VH+ |
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Long story short ... my retirement has been redefined as an interrum sabatical. 
The first puzzle can be solved with a few VH+ steps.
| Code: | +-----------------------+
| 2 6 . | . . 9 | . . . |
| 1 8 9 | 2 6 . | . . . |
| . 5 . | . . 1 | . 9 . |
|-------+-------+-------|
| . 7 . | 5 . . | . . . |
| . 1 . | . . . | 5 7 . |
| 5 . 6 | . . 4 | . . 9 |
|-------+-------+-------|
| . . . | . 4 . | . . . |
| . . 2 | . 3 . | . . 5 |
| . . . | . . 2 | . 1 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
Remove a few clues using gsf's solver, and it becomes more difficult ... with something for everyone.
| Code: | +-----------------------+
| 2 6 . | . . 9 | . . . |
| 1 8 . | 2 6 . | . . . |
| . 5 . | . . 1 | . 9 . |
|-------+-------+-------|
| . 7 . | 5 . . | . . . |
| . 1 . | . . . | 5 7 . |
| . . 6 | . . 4 | . . 9 |
|-------+-------+-------|
| . . . | . 4 . | . . . |
| . . 2 | . 3 . | . . 5 |
| . . . | . . . | . 1 6 |
+-----------------------+ # harder
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon May 17, 2010 10:07 pm Post subject: |
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I am happy to be the first to "WELCOME YOU BACK" 
Ted     |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon May 17, 2010 11:09 pm Post subject: |
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A two stepper for the first puzzle.
| Quote: | ER7 with hinge in box9 and SL r2c69; r8c6<>7,
ER8 with hinge in box8 and SL r68c7; r6c4<>8.
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Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue May 18, 2010 12:23 am Post subject: |
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| Quote: | | Long story short ... my retirement has been redefined as an interrum sabatical. |
Good news. I like Jones better than Vanhegan and Menneske anyways. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue May 18, 2010 3:39 am Post subject: |
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For the second version of the puzzle, I had a small BBDB event involving six moves.
| Quote: |
xy-wing 37-8 with vertex 37 in r2c6; r456c5<>8,
xy-wing 37-8 with vertex 27 in r2c9' r1c9<>8,
ER7 with hinge in box9 and SL r2c69; r8c6<>7,
w-wing 78 in r3c5 & r9c1 with SL7 in r29c6; r9c5<>8
w-wing 78 in r7c9 & r9c1 with SL7 in r8c17; r7c1<>8
(8)r7c4 - r7c9 = r45c9 - r6c78 = (8)r6c4; r7c4<>8 |
A fun VH+ type puzzle.
Ted |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue May 18, 2010 3:59 am Post subject: Re: Puzzle 10/05/17: VH+ |
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| daj95376 wrote: | Long story short ... my retirement has been redefined as an interrum sabatical.
The first puzzle can be solved with a few VH+ steps.
| Code: | +-----------------------+
| 2 6 . | . . 9 | . . . |
| 1 8 9 | 2 6 . | . . . |
| . 5 . | . . 1 | . 9 . |
|-------+-------+-------|
| . 7 . | 5 . . | . . . |
| . 1 . | . . . | 5 7 . |
| 5 . 6 | . . 4 | . . 9 |
|-------+-------+-------|
| . . . | . 4 . | . . . |
| . . 2 | . 3 . | . . 5 |
| . . . | . . 2 | . 1 6 |
+-----------------------+
|
Play this puzzle online at the Daily Sudoku site
Remove a few clues using gsf's solver, and it becomes more difficult ... with something for everyone.
| Code: | +-----------------------+
| 2 6 . | . . 9 | . . . |
| 1 8 . | 2 6 . | . . . |
| . 5 . | . . 1 | . 9 . |
|-------+-------+-------|
| . 7 . | 5 . . | . . . |
| . 1 . | . . . | 5 7 . |
| . . 6 | . . 4 | . . 9 |
|-------+-------+-------|
| . . . | . 4 . | . . . |
| . . 2 | . 3 . | . . 5 |
| . . . | . . . | . 1 6 |
+-----------------------+ # harder
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Play this puzzle online at the Daily Sudoku site |
Danny,
Can you please (again) explain the symmetry in your puzzles? Am I correct, that the gsf version is not symmetric?
Keith
Seinfeld: "Not that there's anything wrong with that." |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue May 18, 2010 6:01 am Post subject: Re: Puzzle 10/05/17: VH+ |
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| keith wrote: | Can you please (again) explain the symmetry in your puzzles? Am I correct, that the gsf version is not symmetric?
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I can generate puzzles with either 180-degree rotational symmetry or with reflective symmetry across the \-diagonal. For a long time, I've stayed with the reflective symmetry.
I infrequently generate minimal puzzles; i.e., no more clues can be removed and the puzzle still has one solution. This is often because removing another pair of givens (to maintain symmetry) would make the puzzle more difficult than I desire. At other times, only non-symmetric givens can be further removed from my puzzle.
Recently, ronk informed me that gsf's solver will remove givens w/o concern for symmetry while searching for a minimal puzzle that's still solveable. (It probably handles symmetry as well, but I wasn't interested.) With this new ability, I can post-process my easy/moderate symmetric puzzles and often find a reasonably difficult puzzle by using gsf's solver to remove non-symmetric givens. This gives me flexibility that I didn't have previously.
Often, I just post my symmetric puzzle. Sometimes, as I now encounter them, I will post a non-symmetric versions of my puzzles after running gsf's solver. Other times, I will post two versions of a puzzle with overlapping clues/givens and the same solution.
Bottom Line: a puzzle's solution drives what I post.
Regards, Danny
[Edit: corrected all of the incorrect variations of symmetry.]
Last edited by daj95376 on Tue May 18, 2010 2:39 pm; edited 1 time in total |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Tue May 18, 2010 9:33 am Post subject: |
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Dajtastic!
That is marvellous news Danny. I think you got caught between two stools with "interrum" which sounds like a "fin" of interim and interregnum!
I now need to go back to your post and really digest that information about symmetry
Don't know if you ever were on Havard's board but he had a poster there (claudiarabia??) whose puzzles were like topiary and "shaped" eg like a heart etc. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue May 18, 2010 11:14 am Post subject: |
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Great to have you posting puzzles again!
Nice fish opened this one up for me.
| Quote: | Sashimi Swordfish(8) r168c678; r6c45<>8
xy-wing(378) r2c9; r1c9<>8 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue May 18, 2010 11:55 am Post subject: |
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| peterj wrote: |
Nice fish opened this one up for me.
| Quote: | Sashimi Swordfish( r168c678; r6c45<>8
xy-wing(378) r2c9; r1c9<>8 |
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That fish was a great find
To bad the move is not available in the alternate version.
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue May 18, 2010 12:10 pm Post subject: |
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For the harder one...
Ted, yes, sadly the swordfish had gone... but a nice grouped kite instead (same as your AIC move I think?)
| Quote: | kite(7) (7)r8c7=r1c7-r2c9=r2c6; r8c6<>7
xy-wing(378) r2c9; r1c9<>8
grouped kite(8) (8)r6c4=r6c78-r45c9=r7c9; r7c4<>8
xy-wing(678) r8c6; r7c9<>7
xy-chain (7=3)r2c6-(3=8)r4c6-(8=6)r8c6-(6=7)r7c4; r13c4<>7, r9c6<>7 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue May 18, 2010 1:11 pm Post subject: |
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| peterj wrote: | For the harder one...
Ted, yes, sadly the swordfish had gone... but a nice grouped kite instead (same as your AIC move I think?)
| Quote: | kite(7) (7)r8c7=r1c7-r2c9=r2c6; r8c6<>7
xy-wing(378) r2c9; r1c9<>8
grouped kite( (8)r6c4=r6c78-r45c9=r7c9; r7c4<>8
xy-wing(678) r8c6; r7c9<>7
xy-chain (7=3)r2c6-(3=8)r4c6-(8=6)r8c6-(6=7)r7c4; r13c4<>7, r9c6<>7 |
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Peter, how did you remove (8)r6c5 to allow the grouped kite?
I used another xy-wing 37-8.
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Tue May 18, 2010 2:34 pm Post subject: |
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| Mogulmeister wrote: | ... interim ...
I now need to go back to your post and really digest that information about symmetry
Don't know if you ever were on Havard's board but he had a poster there (claudiarabia??) whose puzzles were like topiary and "shaped" eg like a heart etc. |
Yes, I knew that I'd misspelled interim; but, after being sick with some nasty bug for a week, I forgot to check for the correct spelling. Thanks for keeping me honest. (I also corrected the misspellings of symmetry. I know better but must have been tired.)
Yes, I went overboard in my response about symmetry. I tend to add too much information. The best answer is that most of my puzzles are \-diagonal symmetric ... but recent endeavours with gsf's solver have allowed me to post more interesting, non-symmetric versions of puzzles that I might otherwise have passed on posting.
Yes, I know of Havard's board, but never took the time to review it closely. I know of Claudiarabia from the Players' Forums. She posted many artistic puzzles there. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue May 18, 2010 3:12 pm Post subject: |
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I used:
Kite (7)
XYZ-Wing (789)
Coloring (8) |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Tue May 18, 2010 3:43 pm Post subject: |
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| daj95376 wrote: |
Yes, I went overboard in my response about symmetry. I tend to add too much information. |
Not for me you didn't - I need all the help I can get. Glad to hear you are recovering! |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue May 18, 2010 7:55 pm Post subject: |
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[quote="tlanglet
Peter, how did you remove (8)r6c5 to allow the grouped kite?
I used another xy-wing 37-8.
Ted[/quote]
Ted, quite right, I used that xy-wing - too much backtracking and I forgot about it!  |
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