Battenburg
Place the digits from 1 to 9 in every row, column and 3x3-block. Wherever 2 odd and 2 even digits form a 2x2 checkerboard pattern, a Battenburg marking is given. If there is no marking, the above pattern is not allowed.
Author:罗思远(Siyuan Luo)
Click to PenpaThanks Dandelo.
Solution code: Row1,Column9
on 23. March 2022, 18:15 by cdwg2000
Added penpa+ short link,Thanks Dandelo.
on 23. March 2022, 18:06 by Dandelo
Very nice.
https://tinyurl.com/ydevhc7g
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