Shade cells on the board so each pearl has half of its neighbors shaded.
A pearl between edges counts those two cells; a pearl in an intersection counts those four; a pearl in a cell center counts its four diagonal neighbors.
Edge pearls count everything off the board.
Cells off the board count as unshaded. (unfinished)
A pearl in a cell center sits on an unshaded cell. (unfinished)
Breaks rule 1: Shade cells on the board so each pearl has half of its neighbors shaded.
Breaks rule 2: A pearl between edges counts those two cells; a pearl in an intersection counts those four; a pearl in a cell center counts its four diagonal neighbors.
Breaks rule 3: Edge pearls count everything off the board.
Breaks rule 5: A pearl in a cell center sits on an unshaded cell. (unfinished)