This rule was supposedly brought in to protect the rider at number 2 in a team because the tactical substitue was nearly always used in heat 8, but the real reason the promoters brought this rule in was to save money. When this magic double points rule was brought in teams were allowed to change riders riding at number 2, 3 and 4. The tactical rule does not make a meeting closer when compared to the old tactical substitue.
Double points rule gains a maximum of 3 pts
Heat 8 tactical substitute ( should be a 4 - 2 to the home side) Home No 2 beating away No 2 and home No 7 beating away No 7, Away team uses a Tac sub (away teams No 1 or best rider on the night) and turns this heat into a 4 - 2 for the away side (home side - 2 away side + 2), a difference of 4 points.
Big problem with this the away teams No 1 has to be paid for scoring an extra 3 points.