## Which techniques were used?

Post the puzzle or solving technique that's causing you trouble and someone will help

### Which techniques were used?

Hi,

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

Attachments
IMG2
IMG2.png (181.85 KiB) Viewed 463 times
IMG1
IMG1.png (230.09 KiB) Viewed 463 times
afortress

Posts: 1
Joined: 13 March 2013

### Re: Which techniques were used?

afortress wrote:Hi,

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

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
daj95376
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