dyitto wrote:It was speeded up by checking if two landcells can be found that are definitely separated by a water line - which was actually quite easy to program.
The second puzzle was solved in 3 hrs. Checking that the solution is unique was at least ready when I looked the next morning.
I'm not very surprised that one takes long because it employs a few observations at the start that i assume are hard to program. As they are all the same number and not connectable with one area of 8 cells, every clue needs at least 2 sections. Then the second observation is that because all numbers are seperated by at least 2 cells, except for one pair so all size 7 islands would have to touch one of those cells.
Those were the 2 ideas I set at the start after placing the first 2 clues in the top left corner. As long as I would make sure all 8s were spread enough and were never 1 or fewer cells apart, I would be sure the logic I used i the beginning would hold.