Again coming back to this trigger, consider the following:
Favourite at Home (odds <1.80)
if 1-0 to the favourite in first halve, then green up with small profit.
If 0-0 at HT then green up 0-0 and distribute the loss on the draw (only possible with high 0-0 back odds to low lay the draw odds). Small profit again.
if 0-1 to the underdog, then apply the following:
lay the underdog for 75% of the lay the initial draw amount, and
back the draw for 50% of the lay the draw amount.
If 1-1 results, then green up (unless this happens after 70')
If the underdog wins, then liability on the draw is a lot less than what it was initially.
I am working on the trigger and will post it tomorrow, but any feedback welcome.
Also thought about using this trigger for lay the draw with back 1-1 for games where a goal is likely.