If lions are -42.5 @ $1.90 and -47.5 @ $2.10
that is an average of 4c per point
but if you go the other way it doesnt work as easily because $1.90-$1.08(opening price)
= 72c which equals 18 pts which means that formula must change because $1.08 would mean
-24.5 start.
Do you have an idea how it changes as the start decreases.
Cheers
P.s. Your time is your own but I know you love to rack your brain with these things.