PokerTracker 4 includes a comprehensive Tournament Structure editor, these tournament structures are required to facilitate accurate Independent Chip Modeling (ICM) calculation and simulation of tournament result expectation. PokerTracker contains numerous default tournament structure models which are automatically used when ICM calculations are required, but you may find times where tournaments that you have played do not match one of the commonly used structure formats. When this situation occurs, you can use the Tournament Structure editor to assure accurate ICM calculation occurs within PokerTracker 4.