static bool CanBeWhite(Cell c) => !c.IsBlack;
static bool CanBeBlack(Cell c) => !c.IsWhite;
public CellGroup(Cell cell1, Cell cell2, Cell cell3, Cell cell4, Cell cell5, Cell cell6, Cell cell7, Cell cell8, Cell cell9)
{
_cells[0] = cell1;
_cells[1] = cell2;
_cells[2] = cell3;
_cells[3] = cell4;
_cells[4] = cell5;
_cells[5] = cell6;
_cells[6] = cell7;
_cells[7] = cell8;
_cells[8] = cell9;
}