Function distance 

pub fn distance(report: &PlaytestReport) -> u64

How far report’s rates lie outside their bands: over every Check::Rate, max(0, min * count - successes * 100, successes * 100 - max * count), summed. 0 exactly when every rate is inside its band. A Check::Median doesn’t count: it is about the bots, not the stage.

Distances of runs with different try counts don’t compare.