How to click a specific Cell in a Delphi Grid (TSDBGrid) while looping its row values

I have a TSDBGrid with 4 rows (row1, row2, row3, row4(checkbox) ).

Data loaded in the grid is from database and in my automation script I need to uncheck/check the Row4 cells if a certain value in Row1 and Row2 is met. 

Say for example, "unchecked" if row1 and row2 is equal to 1, otherwise set to "checked".

Currently the grid object supports "CellClick()" which only accepts column as parameter. 

thank you.