OBI-Sudoku
(Published on 19. May 2022, 22:37 by olima)
Normal Sudoku Rules apply. The marked cells are OBI-cells, i. e. the digits inside are odd and box-indexing, e. g. a 7 in R4C6 (position 3 in the box) forces a 3 in R6C4 (position 7 of the same box). All OBI-cells are given.
Link to play online
Solution code: rows 2 and 8
Comments
on 9. June 2022, 01:34 by Nell Gwyn
Pretty easy, but the geometry is gorgeous.
--
olima: Thanks for your comment... yes, once you've found a piece of logic in one spot, you can apply it four times around the grid.
on 30. May 2022, 21:18 by Nicholas Roberts
Very interesting breakthrough with the combination of x-wings and negative constraints.
Very much enjoyed it.
--
Thank you for your comment, Nicholas. Seems you've taken the BremSter approach/scenic route on this puzzle. Glad you've enjoyed it. It wasn't so sophisticated, once you realize how powerful the negative constraint is and with use of the symmetry.
on 24. May 2022, 19:11 by olima
Labels hinzugefügt, added labels
on 20. May 2022, 04:11 by kolot
Very nice achievement to get a 90 degrees rotationally symmetric grid with such a simple rule set.
--
olima: Thank you for the pleasant comment. Indexing is indeed a powerful ruleset and fun to play around with.
on 19. May 2022, 22:38 by olima
Nach einem Jahr LMD-Abstinenz, jetzt hoffentlich wieder mit einem spannenden Rätsel.
