No problem for your two part question.
You need to think about each row separately and not think what happens when each check box is checked. So turn your thinking backwards from what it is now. I will refer to "Row x" but we know that really means the fields in Row x
Rule 1
When multiple conditions are true
when any
checkbox 1 is checked
checkbox 2 is checked
checkbox 3 is checked
Show Row 1.
Rule 2
When multiple conditions are true
when any
checkbox 2 is checked
checkbox 3 is checked
Show Row 2.
Rule 3.
When multiple conditions are true
when any
checkbox 3 is checked
Show Row 3.
Then part 2 of your question.
Three Rules,
Rule A
When checkbox 1 is checked
Action
Change Checkbox 2 to unchecked.
Change Checkbox 3 to unchecked.
(and remember to uncheck the box that says to only fire when the condition becomes true)
Rule B
When checkbox 2 is checked
Action
Change Checkbox 1 to unchecked.
Change Checkbox 3 to unchecked.
(and remember to uncheck the box that says to only fire when the condition becomes true)
Rule C
When checkbox 3 is checked
Action
Change Checkbox 1 to unchecked.
Change Checkbox 3 to unchecked.
(and remember to uncheck the box that says to only fire when the condition becomes true)