Pattern?

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Pattern?

Postby mytamhuyet » Wed Feb 06, 2019 10:23 am

I have recently started trying "very hard" sudokus. I bypassed the following roadblock by guessing, but is there a pattern to recognize?

A 2 56 1 \
B 8 9 3457 \
C 467 46 3467 \ 34

A2 must be a 5.

tia q
mytamhuyet
 
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Re: Pattern?

Postby creint » Wed Feb 06, 2019 5:24 pm

A naked quad C1234, has also locked candidates 6 and 7 in 1 box, so you can exclude 6 in A2 and 7 in B3.
You can exclude first 3467 in C56789 with the naked quad and afterwards you can exclude 6 in A2 and 7 in B3 with locked candidates.
creint
 
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