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Puzzle 11/07/17: ~ Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Jul 17, 2011 3:56 pm    Post subject: Puzzle 11/07/17: ~ Advanced Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon Jul 18, 2011 2:42 pm    Post subject: Reply with quote

Another opportunity to conjurer up an unusual step totally inconsistent with the rated level of the puzzle, but great fun.

Kraken fin x-wing (5)r23c19 with fin (5)r5c1; r3c235<>5
x-wing (5)r23c19=(5)r5c1[-(5)r23c1*]-(5=4)r5c3-(4=28)r8c34-(8=47)r83*c1-(57=8)r2c1*-(89=5)r2c73-r2c9=r3c9;

A Type 2 UR(28)r89c34; r5c3<>4=5 completes the puzzle.

[Note that my "funny" notation is an attempt at notating memory for later usage.]

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Jul 18, 2011 5:04 pm    Post subject: Reply with quote

Ted, this is strictly a FWIW comment!!!

I'm not aware of any standard for listing chains with memory. However, my preference is to flag the value. First by marking it on the right side when it's to be remembered, and then on the left side when it's reused later. As such:

x-wing(5)r23c19=(5*)r5c1-(5=4)r5c3-(4=28)r8c34-(*58=47)r83c1-(*57=8)r2c1-(89=5)r2c73-r2c9=r3c9;

FYI, your chain without memory:

x-wing(5)r23c19=(5)r5c1-(5=4)r5c3-(4=28)r8c34-(8)r8c1=(8-7)r2c1=(7-5)r2c9=(5)r3c9;

Regards, Danny
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Mon Jul 18, 2011 5:15 pm    Post subject: Reply with quote

tlanglet wrote:
Another opportunity to conjurer up an unusual step totally inconsistent with the rated level of the puzzle, but great fun.

Kraken fin x-wing (5)r23c19 with fin (5)r5c1; r3c235<>5
x-wing (5)r23c19=(5)r5c1[-(5)r23c1*]-(5=4)r5c3-(4=28)r8c34-(8=47)r83*c1-(57=8)r2c1*-(89=5)r2c73-r2c9=r3c9;

A Type 2 UR(28)r89c34; r5c3<>4=5 completes the puzzle.

[Note that my "funny" notation is an attempt at notating memory for later usage.]

Ted

Hi, Ted. With 8s conjugate c1 you can get by without memory usage.
Code:
 *--------------------------------------------------------------------*
 | 1      245    24568  | 7      25     9      | 48     46     3      |
 | 578    3      589    | 1      4      6      | 89     2      579    |
 | 457    2457   24569  | 3      25     8      | 1      4679   4579   |
 |----------------------+----------------------+----------------------|
 | 2      6      7      | 5      8      1      | 3      49     49     |
 | 45     8      45     | 6      9      3      | 7      1      2      |
 | 9      1      3      | 4      7      2      | 5      8      6      |
 |----------------------+----------------------+----------------------|
 | 3      57     1      | 9      6      4      | 2      57     8      |
 | 478    9      248    | 28     1      5      | 6      3      47     |
 | 6      245    2458   | 28     3      7      | 49     459    1      |
 *--------------------------------------------------------------------*

Using your chain, you can forego the the x-wing as well, which leaves the UR to take it home.

(5=89)r2c37-(8)r2c1=r8c1-(8=24)r8c34-(4=5)r5c3 =>r139c3<>5

Signed,
Luke The Fun Killer Smile
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon Jul 18, 2011 9:12 pm    Post subject: Reply with quote

Luke451 wrote:

Hi, Ted. With 8s conjugate c1 you can get by without memory usage.
Code:
 *--------------------------------------------------------------------*
 | 1      245    24568  | 7      25     9      | 48     46     3      |
 | 578    3      589    | 1      4      6      | 89     2      579    |
 | 457    2457   24569  | 3      25     8      | 1      4679   4579   |
 |----------------------+----------------------+----------------------|
 | 2      6      7      | 5      8      1      | 3      49     49     |
 | 45     8      45     | 6      9      3      | 7      1      2      |
 | 9      1      3      | 4      7      2      | 5      8      6      |
 |----------------------+----------------------+----------------------|
 | 3      57     1      | 9      6      4      | 2      57     8      |
 | 478    9      248    | 28     1      5      | 6      3      47     |
 | 6      245    2458   | 28     3      7      | 49     459    1      |
 *--------------------------------------------------------------------*

Using your chain, you can forego the the x-wing as well, which leaves the UR to take it home.

(5=89)r2c37-(8)r2c1=r8c1-(8=24)r8c34-(4=5)r5c3 =>r139c3<>5

Signed,
Luke The Fun Killer Smile

Luke, you will never be a Fun Killer for two reasons:
1) It is not in your happy nature, and
2) I am having too much fun abusing Danny's wonderful puzzles by solving them is strange ways.

Plus, I enjoy and learn from all the feedback I receive; keep it coming.

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon Jul 18, 2011 9:20 pm    Post subject: Reply with quote

daj95376 wrote:
Ted, this is strictly a FWIW comment!!!

I'm not aware of any standard for listing chains with memory. However, my preference is to flag the value. First by marking it on the right side when it's to be remembered, and then on the left side when it's reused later. As such:

x-wing(5)r23c19=(5*)r5c1-(5=4)r5c3-(4=28)r8c34-(*58=47)r83c1-(*57=8)r2c1-(89=5)r2c73-r2c9=r3c9;

Regards, Danny

Danny, thanks for the suggestion about memory notation. I like it, I like it very much! It is simple and non-invasive. It does leave it up to the reviewer to interpret the memory location in some cases but I would not think that is a significant issue. In the rare cases where the chain could have more than one memory concern, multiple * could be used.

Thanks for another notation suggestion.

Ted Very Happy
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Thu Jul 21, 2011 4:37 am    Post subject: Reply with quote

I played a Finned X-Wing; r3c1<>7, but subsequently found out an actual X-Wing was there.

Four-cell XY-Chain; r8c1<>7
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