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Vanhegan Extreme 06/29/10

 
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tlanglet



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

PostPosted: Wed Jun 30, 2010 3:54 am    Post subject: Vanhegan Extreme 06/29/10 Reply with quote

I worked on this for some time before finding the key.......

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

Play this puzzle online at the Daily Sudoku site

Quote:
ANP(68=4)r46c3 - (4=3)r6c9 - r79c9 = r7c7 - (3=47)r78c2 - (47=8)r3c2; r23c3<>8

Ted
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keith



Joined: 19 Sep 2005
Posts: 3175
Location: near Detroit, Michigan, USA

PostPosted: Wed Jun 30, 2010 5:02 am    Post subject: Reply with quote

Wow. Shocked

But, I sort of don't buy it.

Keith
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Thu Jul 01, 2010 12:10 am    Post subject: Reply with quote

Ted: a nice solution to an uncooperative puzzle.

Note: you can also add r5c2 to your list of elimination cells -- even though it's extraneous in the final analysis.
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Mogulmeister



Joined: 03 May 2007
Posts: 695

PostPosted: Thu Jul 01, 2010 11:12 pm    Post subject: Reply with quote

Sweet. Exclamation
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Luke451



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

PostPosted: Thu Jul 01, 2010 11:46 pm    Post subject: Reply with quote

keith wrote:
Wow. Shocked

But, I sort of don't buy it.

Keith


Works for me. Maybe the last two nodes could be joined, though:
Code:
 *--------------------------------------------------------------------*
 | 49     5      3      | 2      89     1      | 489    7      6      |
 | 6      1      289    | 7      389    4      | 2389   238    5      |
 | 249    478    24789  | 358    6      59     | 23489  2348   1      |
 |----------------------+----------------------+----------------------|
 | 35     9      68     | 358    4      567    | 3578   1      2      |
 | 345    348    1      | 9      3578   2      | 6      348    347    |
 | 7      2      468    | 358    1      56     | 3458   9      34     |
 |----------------------+----------------------+----------------------|
 | 8      347    4579   | 1      2      579    | 347    6      3479   |
 | 1      47     59     | 6      59     3      | 247    24     8      |
 | 239    6      279    | 4      79     8      | 1      5      379    |
 *--------------------------------------------------------------------*

(68=4)als:r46c3 - (4=3)r6c9 - r79c9 = r7c7 - (3=478)als:r378c2
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Jul 02, 2010 4:20 pm    Post subject: Reply with quote

Luke451 wrote:
Works for me. Maybe the last two nodes could be joined,

(68=4)als:r46c3 - (4=3)r6c9 - r79c9 = r7c7 - (3=478)als:r378c2

The als notation often leaves me searching for which values are "active" and which values are "passive". (Similar to which cells are true and which cells are false as you read left-to-right and right-to-left in an AIC containing an Empty Rectangle with an ERI cell.)

I would be tempted to cut out the passive values in this chain and compact it to:

(8=4)r46c3 - (4=3)r6c9 - r79c9 = r7c7 - (3=8)r378c2

But then I'd get into trouble from all directions. _ Laughing

An alternate chain with compact passive values:

(4=3)r45c1 - r9c1 = r9c9 - (3=4)r6c9 => r6c3<>4
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Luke451



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

PostPosted: Fri Jul 02, 2010 6:32 pm    Post subject: Reply with quote

I like it, Danny. storm norm and others have made the same suggestion.

ALS notation seems to fall into two categories. It seems to me each asks something of the reader.

The way I used presents all components of the ALS and leaves it to the reader to discern the operative values.

The way you suggest presents the operative values and leaves it to the reader to discern the ALS components.
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