PokerTracker

Hello boffins!

On my HUD I use 3bet Vs position and an overall fold to 4bet stat. I'd like to expand this to fold to 4bet when the 3better has raised vs a certain position.

Example:

Hero raises UTG and takes a 3 bet from the BTN. Hero would like to know BTN's fold to 4 bet when 3betting vs UTG. The fact that villain is on the BTN is not important but the the fact he is 3 betting UTG is. The same stat would work exactly the same if it was UTG+1 with the 3 bet.

I guess it would be described as "fold to 4 bet after 3 betting vs position"

Take a look at how stats like "3Bet vs BTN 2Bet" are made (type 'vs' into the search field in Configure > Statistics for example). Stats like these will show you how to get the position of the 2Bettor.
Take a look at this post for more information about using the actors and aggressors fields. If you want the position of the 3bettor instead of (or as well as) the 2bettor then you would use the 3rd character of the aggressors string instead of the second to determine that.

Custom Stats Guide
Tutorial: Custom Reports and Statistics

I guess it's something along the lines of this?

(cnt_f_4bet_def_action_fold / cnt_f_4bet_def_opp) * 100 if 3bet_vs_ep_2bet = true

??

You'll need to build new columns for the situations you're looking for.