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Thanks a lot for those valuable explanations.
It definitively seems very interesting and I will give a look to this.

Is there an easy mean to go for periodic grids (by encoding some kind of special constraint on the borders) ? It would avoid to surround the grid with 0 to deal with its expansion ...

GoL can't be reversed. There are too many options that converge to the same patterns.

That's maybe a good general summary, but there are a lot of exceptions that should be mentioned.

In early 2018, Tom Rokicki put together an experimental patch for Golly that allowed it to call a SAT solver ...

Hello there,

I'm a bit new on this forum but, as it seems full of competent people on the GoL subject, it may be a good place for my topic.
I know that discussions are more related to interesting evolving patterns but, in my case, I'm more about working on an algorithm to run the game in reverse ...