docs: def get_95_percentile_bleak(games_nr, n_back=500):
      """Gets the 95th percentile of bleakest_eval from bigtable"""
      end_game = int(games_nr.latest_game_number)
      start_game = end_game - n_back if end_game >= n_back else 0
      moves = games_nr.bleakest_moves(start_game, end_game)
      evals = np.array([m[2] for m in moves])
      return np.percentile(evals, 5)