Confused

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Confused

Postby Yogi » Fri Aug 11, 2017 9:17 am

4538...9..2..4.83..7.3...4..4..36.29231..476.96527.4.331...295..94.5.3.2582..367.
This is the position after basics of the August1 posted puzzle. Cells r6c68 & r8c8 are all limited to candidates 1,8.
Does that not mean that r8c8 cannot be 1 or 8 as that would lead to multiple solutions through a Unique Rectangle?
Yogi
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Re: Confused

Postby eleven » Fri Aug 11, 2017 1:11 pm

No, unique rectangle cells must be in 2 boxes (and 2 rows and 2 columns).
If they are, in a solution you could exchange the 2 digits and would get a second solution.
If they are in 4 boxes, an exchange would give you 2 of the same digit in each of the boxes, i.e. no valid solution.
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Re: Confused

Postby Yogi » Sun Aug 13, 2017 7:29 am

Right! Thanx.
- Yogi
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