The similarity is defined as 1% of the pot EV difference (where the 1% is a setting that can be changed from the viewer). However if more hands have similar EV loss we will add mixing of both of them. Of a given action we are first reducing strategy for those actions and those hands for which the EV's loss is the smallest. In node locking 2.0 changing frequency of one action results in changing frequency for all other actions (except if they've been explicitely disabled).
