nr. 966 - Coralfinder

I didn't created new puzzles for the blog nowadays. I made this Coralfinder some years ago for the 24 hours puzzle championship. Finally I didn't use it. On the last WPC there were a Black and White round in which the Coralfinder had really high points. So I was almost sure that it would be 12x12. I shared this puzzle with the Hungarian team as practise puzzle. I tried to solve this puzzle again during the bus trip between the WSC and WPC. Somehow, I suffered  but Bram de Laat help me to solve my puzzle :) Now I solved it again, and now it was a bit easier than last time :)

Rules for Coralfinder