I'll just paste couple of statements from Activisions US20190091577A1 Patent:
You can read full document https://patents.google.com/patent/US20190091577A1/en [0084] In another example, the 'accuracy of enemy attacks' may call for modifications provided to high skill level players that involve 'enemy attacks never missing the player', whereas, modifications provided to low skill level players may involve 'enemy attacks sometimes missing the player'. Accordingly, a table, database, or other dataset includes an “enemies attacks” entry, wherein a different value is separately assigned to each skill level and wherein each of the different values is associated with an accuracy of enemies attack, with higher skill levels having values associated therewith a greater accuracy of enemies attack and with lower skill levels having values associated therewith a lower accuracy of enemies attack