static Best<F1<RGBImage, RectAndState>> video_scoreRectAndState_step(Best<F1<RGBImage, RectAndState>> best, L<RGBImageRectAndState> images, F1<RGBImage, RectAndState> recognizer, O... _) {
  double tolerance = first(images).image.getWidth()/2.0;
  new Scorer scorer;
  for (RGBImageRectAndState i : images)
    video_scoreRectAndState(scorer, i.rect, i.state, recognizer.get(i.image), tolerance);
  if (optPar(_, print := true))
    best.putAndPrintIfNewBest(recognizer, scorer!);
  else
    best.put(recognizer, scorer!);
  ret best;
}