For example, consider two hypotheses that we'd like to score against the reference translation witness for the past. Here are the hypotheses along with chrF values computed using parameters k = β = 2 (in real examples, k would be a higher number like 6): REF: witness for the past, HYP1: witness of the past, chrF2,2 = .86 HYP2: past witness chrF2,2 = .62