Response times can be divided with quantiles with a q selected for the desired granularity, and comparable moves should be those that occur in similar semantic contexts, that is, [m j−n ..m j+n ] where m j is the move in question, examined in a window of size 2n + 1.
p(t i |m j−n ..m j ..m j+n ) represents the probability that a response time t falls in an interval i given a move and surrounding context.