A family of Microsoft relational database management systems designed for ease of use.
You can set up rules in conditional formatting. In design view you select the control that you want the appearance to change and the select conditional formatting from the Format tab. You then add a new rule that uses the Expression Is and enter your conditional expression. My field to check against was [AntherNumber] ([Checked] in the OP question) and I was checking for the value 4. I set the background and foreground to white to somewhat hide the value. This might not work as well if your section background color is not white.
There is a limit to the number of conditions that can be added to one control through the user interface.