## How could this rectangle be correct?

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

### How could this rectangle be correct?

I solved an "annoying" puzzle today and am surprised that the rectangle marked in red is there.
This sudoku puzzle has two solutions which should not be possible. Or?
Where am I thinking wrong?
/Annette
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Sudoku with two solutions?
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Hobbelobban

Posts: 2
Joined: 15 June 2018

### Re: How could this rectangle be correct?

R34C12 meets most of the criteri for being a deadly rectangle, however R4C12 are both clues, which prevents this from forming a deadly pattern. As you are not allowed to change clues, the digits can not be swapped.

Posts: 85
Joined: 17 April 2010
Location: Silver Spring, MD, USA

### Re: How could this rectangle be correct?

Of course!
Thank you!!!
I realize that now since you pointed it out.
I am fairly new to sudoku and love your app where I learn so much. And I am even happier now when I found this forum.
Once again Thank you so much!
Hobbelobban

Posts: 2
Joined: 15 June 2018