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DG KiMo 7

HATMAN’s Current Obsession: DG Killer (Disjoint Groups)

I have recently started looking at Disjoint Groups (DG) and after trying one out I thought about transposes and came up with the obvious one from Row-Column format to Nonet-Spot format. The next idea of course was to put some cages in one format and some in the other and see what we get.

Being, as usual, lazy I nicked some numbers from Menneske, transposed them to minimise swappable pairs and transformed them to NS format. My target was to do the whole thing in four-square cages with a cross of un-caged cells. However once I removed some duplication from cages it ended up somewhat ugly (i.e. non-symetrical), even then I could not solve it and needed to add some cages on the cross. I submit it above for your delectation. Please comment.

Disjoint groups are have been around a while but I cannot find any DG killers - no doubt there are some on Japanese websites.

For some DG examples (with pretty colours) check http://www.menneske.no/sudoku/dg/3/eng/

Sniqe gives a good description of the transform on website http://www.4dsudoku.com/help.pdf. However he uses the terms Block and Hyper-block, whereas I prefer to follow Shai’s nomenclature and use Nonet. So to match up I use the term Spot as in the same Spot in the Nonet.

HATMAN (Maurice Smith)