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Difficulty: Easy Wednesday, February 11, 2015

Not Completed Play This Puzzle

CHAT LOG for Wednesday, February 11, 2015

12:07 am
digondda

Thanks for the explanation Unike.
12:10 am
WHB

Done
12:18 am
JeffysMom

Done
12:39 am
drwho

Difficulty score 22. No green.
2:58 am
Phil

Unlike, being a visual person, could you show an example of the block pincer or point me in the direction of s website to learn these advanced techniques.
2:58 am
Phil

start
3:06 am
Phil

ding
6:06 am
tincup

done
7:28 am
ypsigirl

done
10:16 am
KnightTime

Phil - drwho's web page has a good write-up on advanced techniques. Plus if you use "advanced sudoku tips" to search google you will get plenty of sites. The biggest problem is the inconsistency in terminology. One person will call it a "pincer" another will call it something else.
10:53 am
digondda

Thanks KnightTime, that's very helpful.
11:53 am
UnikeTheHunter

Phil. Block Pincer is a technique I discovered myself, so I don't know another name for it or where it's pictured. It's difficult to draw here, but I'll try showing the most basic form. There are many variations.
12:08 pm
UnikeTheHunter

The idea is, IF the upper left is a 6, then the lower right must also be a 6. And if so, then all those cells marked with B in the lower left are guarded against being 6. If that blocks 6 from being placed anywhere in the lower left block, then 6 must NOT be in the upper left.

(#,#)(#,6)(#,#) ...................(#,6)(#,#),(#,#)
....
....\n
....
(#,#)(B,B)(#,#)
(B,B)(B,B)(B,B)........\n.............(#,6)(#,#)(#,#)
(#,#)(B,B)(#,#)
12:10 pm
UnikeTheHunter

Wish I could go back and edit. Somehow \n got in there.
1:51 pm
Doll414

go
1:56 pm
zoomzoom

Done.
2:03 pm
Doll414

done, ng
2:11 pm
helenkeller

go
2:18 pm
helenkeller

done
8:41 pm
UnikeTheHunter

DING. Kind of slow going at first. 22.
10:25 pm
Prinise

Done