champagne wrote:The concept of "J Exocet" is not mine. I can be wrong about the limits of that subset of the exocets family.
So far, I have not seen a clear definition of the spec for downgraded forms, so there is room for interpretation
I'm not quite sure what you mean by "downgraded forms". In English this could be a "degenerate" form where one or more elements of the pattern have already been solved, for example when the digit in a target cell is already known. The rest of the pattern may then have an extra inference that can be used to make eliminations.
As a manual solver, I usually work out these extra inferences as I find different cases in puzzles, but I can imagine the problems that they pose for programmers. If you post the grids for the cases that interest you, I can possibly help.
This raises another problem I have with exchanges I have with you (and others). Recently you asked a series of questions which I replied to in a way I hoped you would understand. When you didn't respond to my answers, I'm left guessing whether you understood them or not. That makes it difficult for me if the same point arises in later posts.
What I would appreciate is a reply like "Thanks, I understand" or "Thanks, I still don’t follow/agree, but let's leave it for now".