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Puzzle 10/02/12 (A)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Feb 12, 2010 6:54 pm    Post subject: Puzzle 10/02/12 (A) Reply with quote
Code:
 +-----------------------+
 | 2 8 . | . . . | 7 . . |
 | 4 3 . | . . . | . . 8 |
 | . . 7 | . 5 . | 4 2 . |
 |-------+-------+-------|
 | . . . | 4 . . | . . . |
 | . . 3 | . 7 . | . 5 9 |
 | . . . | . . 3 | . . 4 |
 |-------+-------+-------|
 | 3 . 1 | . . . | 9 . . |
 | . . 4 | . 9 . | . 1 6 |
 | . 7 . | . 1 5 | . 4 . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 13, 2010 5:26 am    Post subject: Reply with quote
Four and one-half steps.

Quote:
1. ER (8)
2. X (8)
3. XY (586)
3.5 Pincer transport on above
4. XY (175)
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Feb 13, 2010 8:41 am    Post subject: Reply with quote
One step but a loooong AIC.
Code:
 *--------------------------------------------------------------------*
 | 2      8      569    | 169    3      4      | 7      69     15     |
 | 4      3      569    | 12679  26     1267   | 15     69     8      |
 | 169    169    7      | 689    5      68     | 4      2      3      |
 |----------------------+----------------------+----------------------|
 | 15678  156    268    | 4      268    9      | 1268   3      17     |
 | 68     4      3      | 126    7      126    | 268    5      9      |
 | 16789  169    2689   | 5      268    3      | 1268   78     4      |
 |----------------------+----------------------+----------------------|
 | 3      256    1      | 268    4      268    | 9      78     57     |
 | 58     25     4      | 2378   9      278    | 358    1      6      |
 | 689    7      689    | 368    1      5      | 38     4      2      |
 *--------------------------------------------------------------------*
(7)r6c1 = (7)r6c8 - (7)r7c8 = (7-5)r7c9 = (5)r7c2 - (5)r4c2 = (5-7)r4c1 =
(7)r6c1; r6c1=7
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Feb 13, 2010 9:31 am    Post subject: Reply with quote
Hello Dan,

This is only a comment that you may find useful. Your chain is perfectly fine.

I recently wrote a new chain() module for my solver, and I implemented Eureka notation in the output. However, I recalled RonK's criticism of redundancy in Eureka notation making for longer looking chains. So, I implemented a truncated version of Eureka notation. Here's how your chain would look using the truncated notation.

(7)r6c1 = (7)r6c8 - (7)r7c8 = (7-5)r7c9 = (5)r7c2 - (5)r4c2 = (5-7)r4c1 = (7)r6c1; r6c1=7

(7)r6c1 = r6c8 - r7c8 = (7-5)r7c9 = r7c2 - r4c2 = (5-7)r4c1 = (7)r6c1; r6c1=7

Note: I still keep the final parentheses information.

Regards, Danny
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Feb 13, 2010 1:49 pm    Post subject: Reply with quote
daj95376 wrote:
Hello Dan,

This is only a comment that you may find useful. Your chain is perfectly fine.

I recently wrote a new chain() module for my solver, and I implemented Eureka notation in the output. However, I recalled RonK's criticism of redundancy in Eureka notation making for longer looking chains. So, I implemented a truncated version of Eureka notation. Here's how your chain would look using the truncated notation.

(7)r6c1 = (7)r6c8 - (7)r7c8 = (7-5)r7c9 = (5)r7c2 - (5)r4c2 = (5-7)r4c1 = (7)r6c1; r6c1=7

(7)r6c1 = r6c8 - r7c8 = (7-5)r7c9 = r7c2 - r4c2 = (5-7)r4c1 = (7)r6c1; r6c1=7

Note: I still keep the final parentheses information.

Regards, Danny

Thanks Danny I like it.!
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Feb 13, 2010 3:53 pm    Post subject: Reply with quote
arkietech wrote:
Thanks Danny I like it.!

Great! I was hoping to get a grass-roots movement going on using the truncated Eureka notation, and your chain seemed like the perfect place to start because it used just two values across eight cells.

Regards, Danny
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
PostPosted: Sun Feb 14, 2010 12:01 am    Post subject: Reply with quote
daj95376 wrote:
arkietech wrote:
Thanks Danny I like it.!

Great! I was hoping to get a grass-roots movement going on using the truncated Eureka notation, and your chain seemed like the perfect place to start because it used just two values across eight cells.

I'm on that train with you, all aboard! "Short form" Eureka is already in common use.

If you'll forgive a reference from the "Other Forum," DonM recently acknowledged as much:
Quote:
I might also add that, one can still use the 'short form' of Eureka notation whereby after the first placement of a digit in parentheses, subsequently, it doesn't have to be notated at all until a different digit is used.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Feb 14, 2010 5:12 pm    Post subject: Reply with quote
Code:
 r5c3    2-String Kite                   <> 8    r9c7

 r58     X-Wing                          <> 8    r469c1,r46c7

 <58+6>  XY-Wing  r8c1/r5c1+r7c2         <> 6    r9c1,r46c2

 <17+5>  XY-Wing  r4c9/r4c2+r7c9         <> 5    r7c2
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