Mathimagics wrote:Thanks, Tarek!

Sampling 10 million 18C minimal puzzles suggests 1 in ~900 are pearls, BTW. That's pretty close to the 17C case (57, or 1 in 862)

Are there any instances of non-minimal pearls?

Hi Mathimagics,

just considering the definition or a pearl and of a diamond, taking a puzzle and making simplest moves first, you reach the position where the remaining puzzle is a diamond. You are in basically in a pearl position when you have done all moves rated below 2.3 if you take this as start.

Hope this is the right answer to your point