Fully symmetrical invalid patterns

Everything about Sudoku that doesn't fit in one of the other sections

Re: Fully symmetrical invalid patterns

Postby denis_berthier » Mon Apr 11, 2022 10:14 am

Serg wrote:
denis_berthier wrote:... I now see in the post you mentioned that this pattern has only 7 minimal puzzles (modulo iso).

These 7 "fractal" puzzles are not minimal. If I am not mistaken, each of them has 2 extra clues.

Right, the definition doesn't imply minimal.

BTW, the list of max-invalid and min-valid patterns are redundant. If a pattern isn't invalid, then it's valid by your definition. Or am I missing anything?
denis_berthier
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Re: Fully symmetrical invalid patterns

Postby Serg » Mon Apr 11, 2022 10:44 am

Hi, Denis!
denis_berthier wrote:
Serg wrote:BTW, the list of max-invalid and min-valid patterns are redundant. If a pattern isn't invalid, then it's valid by your definition. Or am I missing anything?

You are right. It's sufficient to use one of these lists (max-invalid or min-valid). Both list are present for the sake of generality.

Serg
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