Which techniques were used?

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Which techniques were used?

Postby afortress » Wed Mar 13, 2013 2:24 pm

Hi,

Can you please help.
I want to know which techniques the computer used to go from IMG1 to IMG2.
I've attached the screen shots.

Thanks in advance,
Attachments
IMG2.png
IMG2
IMG2.png (181.85 KiB) Viewed 381 times
IMG1.png
IMG1
IMG1.png (230.09 KiB) Viewed 381 times
afortress
 
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Re: Which techniques were used?

Postby daj95376 » Wed Mar 13, 2013 6:14 pm

afortress wrote:Hi,

Can you please help.
I want to know which techniques the computer used to go from IMG1 to IMG2.
I've attached the screen shots.

Thanks in advance.

Code: Select all
 IMG1 ... plus r4c5 containing <6>
 +--------------------------------------------------------------------------------+
 |  467     8       1       |  467     2       9       | a46      3       5       |
 |  4567    2       4567    |  467     4567    3       |  19      8      b19      |
 |  3456    9       3456    |  468     1       568     | a246     7       246     |
 |--------------------------+--------------------------+--------------------------|
 |  1368    13      9       |  2       367     678     | a346     5       467-3   |
 |  36      7       2       |  5       9       4       |  8       1       6-3     |
 |  3568    4       3568    |  3678    367     1       | a236     9       267-3   |
 |--------------------------+--------------------------+--------------------------|
 |  12347   13      347     |  1347    8       257     |  159-3   6      b139     |
 |  123478  6       3478    |  9       3457    257     |  15-3    24     b138     |
 |  9       5       348     |  1346    346     26      |  7       24     b138     |
 +--------------------------------------------------------------------------------+
 # 109 eliminations remain

   c7    Naked  Quad (a)                 <> 2346 r78c7
   c9    Naked  Quad (b)                 <> 1389 r456c9

         Naked  Single                   =  6    r5c9

It's impossible to tell which of the Naked Quads is performed by the solver, maybe both. If only one Naked Quad was performed, then a Locked Candidate was also performed. Finally, a Naked Single completes the results for IMG2.

What's more important is how r4c5<>6 occurred because it's not justified from what I see.

Regards, Danny
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