wjm wrote:

I imagine that Patrick must review it first and assess for a variety of qualities, maybe including a computer program that tests for a single solution (Patrick?). I apologize if this subject has already been covered in the forum.

No problem. Yes, I run it through the solver first, to see if it has a single solution,

and to get an estimate of the difficulty level.

If there's a problem with the puzzle, of course I won't put it online, but you'll get an email from me