Coordinates Sudoku
(Published on 28. April 2020, 22:57 by stephane.bura)
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Place a digit from 1 to 9 into each cell of the grid so that every row, column and outlined 3x3 region contains each digit exactly once. Each of the 9 regions is associated with one digit, shown as its background. Inside a region, if two neighboring digits – orthogonally or diagonally – are the coordinates in the grid of the associated digit, a line must join them. In this puzzle, the coordinates (1,1) indicate the top left corner of the grid. Example Since 2 and 6 are joined by a line in the 1 region, one or two of the cells marked by a star must contain a 1. Since 6 and 8 are neighbors in the 1 region but are not joined by a line, the cells marked by a cross cannot contain a 1. |
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Solution code: Column 7, column 9
Comments
on 28. October 2020, 18:34 by stephane.bura
Thanks :)
If you like the concept and one of the tricks used in Richard's puzzle, I recommend this puzzle which I like better than the one on this page:
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=0003EM
on 28. October 2020, 18:20 by Rollo
Auch sehr schön! Danke Richard für den Hinweis in SVS 292.
on 29. April 2020, 00:56 by zhergan
Nice concept. Thanks..
on 28. April 2020, 23:31 by Circleconstant314
@stephane.bura OK, thank you!
on 28. April 2020, 23:19 by stephane.bura
@Circleconstant314 Positions of Z are excluded only if X and Y are neighbors in the region *and* they're not joined by a line. It's not enough that a line doesn't join them.
on 28. April 2020, 23:18 by stephane.bura
@glum_hippo Precision on the coordinates' origin. The stars are in the correct positions. The coordinates don't refer to the regions but to the row and column of the digit.
on 28. April 2020, 23:15 by Circleconstant314
I want to make sure I get the rules here. If two digits X and Y are joined by a line in block Z, then Z must exist in RXCY or RYCX? And if X and Y are not joined by a line in block Z, then Z cannot be in either RXCY or RYCX?
on 28. April 2020, 23:13 by glum_hippo
Should the 2nd star be in R4C8? i.e., the 1 in block 6 is in position 2 OR the 1 in block 2 is in position 6?
