Hi
depends which selections you want to bet, I don't think you need to use a remember trigger because actual_sp is available during in-play, try this:
any of your conditions first... and then
and selections sorting order is defined by actual_sp
and selections trigger expression match_3_actual_sp is greater than x
this will filter your selections, sort them by actual_sp, and check the third lowest matching selections actual_sp is greater than x