Odd-even diagonal sudoku

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Odd-even diagonal sudoku

Postby urhegyi » Wed Feb 10, 2021 11:04 am

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rules:
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solution:
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538279146962541738471683259296415873347896521185732964754968312619327485823154697
urhegyi
 
Posts: 361
Joined: 13 April 2020

Re: Odd-even diagonal sudoku

Postby urhegyi » Thu Feb 11, 2021 3:28 pm

I saw this was related to Gurths symmetrical placement!
The only conclusion I can make is that R4C6,R5C5,R6C4 must be odd!
Then it unfolds with a skyscraper and a naked quad!
So these are the only valid placements of Odd and Even candidates on the Diagonal!
Image
So R8C2 =1 and R2C8=3!
Quad 1579 box 3!
Quad 3579 box 7!
urhegyi
 
Posts: 361
Joined: 13 April 2020


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