The “kr/s” figure is showing thousands of complete rollouts (random games) per second.
Interestingly when pitted against a true random mover version of itself (called rollerRandom), Roller wins all of the games other than sometimes accidentally falling into 3-fold repetition.
Roller can be used in Arena etc like Lozza.
Roller source is here:-
If rollouts last longer than 450 ply, a draw is assumed, as some crazy games can last longer than 1000 ply. This does kinda of compromise the no-knowledge (or “zero”) element, but I can live with it.
It does not terminate at known draws like KK for example, because that is definitely feeding in knowledge; however tempting it is to do so in the name of kr/s.