Use the horse pace abbreviation filter to restrict your system to horses who led, were prominent, held up or a combination of any.
By unticking one or more pace abbreviations, you can ignore runners that ran in that style.
If all pace abbreviations are ticked, then all races will pass the pace abbreviations filter.
You can quickly select or de-select all pace abbreviations by right clicking on the list of pace abbreviations and making your choice from the resulting popup menu.
Here are the pace abbreviation full descriptions:-
L = Led
P = Prominent
H = Held Up
Warning: The pace abbreviation is after the event so can only be used for research not for building a system that would provide qualifiers