New Tops and Time

[glass_oni0n]

How much time is required between top efforts for a lower figure to be considered a new top?

I\'ve been going through the archived Breeders\' Cup races in an attempt to build a very basic par chart for winning speed figures in BC races, previous tops as well as whether or not the race was won with a top, pair, off or X.  

An example of what I\'m looking at is Bar of Gold in the 2017 Filly & Mare Sprint.  She won that race with a TG 1, which the Thoro-Pattern lists as a top, yet in October of the previous year she ran a 4.25-.  Should a handicapper take only the most recent 12 months when considering a new top?

[prist]

You\'re on the right track. What you\'re referring to is called the \"effective top.\" Thoro-Pattern works off effective tops rather than lifetime tops. The parameters are outlined in the Thoro-Pattern instruction sheet.

https://www.thorograph.com/assets/files/basics/thoropattern.pdf