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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.

Free practice: Reverse Spin (Contraefecto)Score 0/0
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On the table, the ringed ball is your ball (1).
Reverse Spin (Contraefecto)
Aim = Start + Arrival / 2 (± compensation)
Your ball:White(cue ball · 1)
Other balls:YellowRed
Expected shot:Reverse Spin (Contraefecto)MixedCushion orderLong → Long → Short
Given:
Arrival10Start40
In this position, what is Aim?

Task: put the given values into the system's formula and calculate Aim. Enter the answer as the number read on the table's Aim scale.