Using ISBLANK formula to create tickbox

Hi,

I'm looking to create a new column which determines whether or not an opportunity we had included a pitch. The results would be based on there being a date in the 'Pitch date' column (True/Yes) or whether it's blank (False/No). Please can someone help me with the formula I need to do this? Example data below, table is called 'Opportunities'

So in this instance A and D would be Yes, B and C would be no. 

Thank you!