Wont they all have at least these 10 equivalent clues ?

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`+---+---+---+`

|1..|...|...|

|...|2..|...|

|...|...|3..|

+---+---+---+

|.4.|.1.|...|

|...|.5.|...|

|...|...|.6.|

+---+---+---+

|..7|...|...|

|...|..8|...|

|...|...|..9|

+---+---+---+

i.e. are there always 2 similar clues in diagonal boxes - probably.?

I suppose untill I find any of these 17s I cant proceed, and im kind of thinking that because of the symmetry there wont be a 17 clue puzzle.

Perhaps the 8/9 template can be subdivided easily into 4 groups.

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`no 9th clue, 1 empty box`

9th clue present, 1 empty box.

no 9th clue no empty boxes

9th clue present no empty boxes

3 clues in a box options, or perhaps single clue boxes would also classify furthur.

Not sure how to go with this. Havard is confident he can do a 4-on search on a 13 template to get 17puzzles !

C