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Puzzle 10/10/31: A14 Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Oct 30, 2010 5:31 pm    Post subject: Puzzle 10/10/31: A14 Advanced Reply with quote

I'm hanging up my hat on posting puzzles. Today's puzzles are the last.

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Tue Nov 02, 2010 5:23 pm    Post subject: Reply with quote

Two turbot moves...
Quote:
kite(8) r5, c4 ; r7c1<>8 with transport - (8)r7c9=r8c9 ; r8c1<>8
skyscraper(5) c4, c8 ; r9c5<>5, r7c9<>5
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Nov 03, 2010 3:33 am    Post subject: Reply with quote

Five moves, including what I think was a Sashimi X-Wing. If it was, it's my first.
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lorne



Joined: 22 Nov 2010
Posts: 5

PostPosted: Tue Dec 07, 2010 3:43 am    Post subject: Name of Technique Reply with quote

Hi all,

In solving this puzzle, I used a coloring technique where 2 values of 8 of the same color could see the only 2 remaining candidates for 8 in a square (r7c9, r8c9). If this color were true, it would negate all 8's from the square. Because the square must contain at least one value of 8, this enabled me to eliminate all values of 8 with this color. I was wondering if there was a formal name for this technique?

Regards, and thnx in advance for any info. you can provide,

Lorne
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Dec 07, 2010 5:48 am    Post subject: Reply with quote

Started at this point ...

Code:
 +-----------------------------------------------------------------------+
 |  4      2569   569    |  3      5689   5689   |  259    7      1      |
 |  12569  8      1569   |  245    4569   7      |  2459   459    3      |
 |  259    7      3      |  245    1      459    |  8      459    6      |
 |-----------------------+-----------------------+-----------------------|
 |  7      59     589    |  58     2      1      |  3      6      4      |
 |  68     46     2      |  7      3      48     |  59     1      59     |
 |  135    1345   145    |  6      459    459    |  7      8      2      |
 |-----------------------+-----------------------+-----------------------|
 |  5689   569    7      |  458    4568   2      |  1      3      589    |
 |  158    145    1458   |  9      7      3      |  6      2      58     |
 |  23     23     5689   |  1      568    568    |  459    459    7      |
 +-----------------------------------------------------------------------+
 # 91 eliminations remain

... there is a 2-String Kite in r5+c4 that performs r7c1<>8.

Code:
 +-----------------------------------+
 |  .  .  .  |  .  8  8  |  .  .  .  |
 |  .  8  .  |  .  .  .  |  .  .  .  |
 |  .  .  .  |  .  .  .  |  8  .  .  |
 |-----------+-----------+-----------|
 |  .  .  8  |  8# .  .  |  .  .  .  |
 |  8* .  .  |  .  .  8* |  .  .  .  |
 |  .  .  .  |  .  .  .  |  .  8  .  |
 |-----------+-----------+-----------|
 | -8  .  .  |  8# 8  .  |  .  .  8  |
 |  8  .  8  |  .  .  .  |  .  .  8  |
 |  .  .  8  |  .  8  8  |  .  .  .  |
 +-----------------------------------+

This exposes a Multiple Colors move where the Blue cells are eliminated because they see the Pink & Amber cells.

Code:
 +-----------------------------------+
 |  .  .  .  |  .  8  8  |  .  .  .  |
 |  .  8  .  |  .  .  .  |  .  .  .  |
 |  .  .  .  |  .  .  .  |  8  .  .  |
 |-----------+-----------+-----------|
 |  .  .  8B |  8G .  .  |  .  .  .  |
 |  8G .  .  |  .  .  8B |  .  .  .  |
 |  .  .  .  |  .  .  .  |  .  8  .  |
 |-----------+-----------+-----------|
 |  .  .  .  |  8B 8  .  |  .  .  8P |
 |  8B .  8  |  .  .  .  |  .  .  8A |
 |  .  .  8  |  .  8  8  |  .  .  .  |
 +-----------------------------------+
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Tue Dec 07, 2010 11:23 am    Post subject: Re: Name of Technique Reply with quote

lorne wrote:
I was wondering if there was a formal name for this technique?

I always thought it was called a "multi-colour wrap".

I played effectively the same elimination as a "kite with transport" (through block 9) in the original puzzle.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Dec 07, 2010 5:05 pm    Post subject: Reply with quote

Quote:
I played effectively the same elimination as a "kite with transport"

Which, of course, might be described as basic "Multi-coloring", although your phrase is very descriptive and not subject to misinterpretation.
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