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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: Tüzül Efekare systemScore 0/0
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On the table, the ringed ball is your ball (1). 2 = the ball your cue ball hits first, 3 = the last ball to hit for the point.
Tüzül Efekare system
Aim = 2 × Table value − Arrival − Start
Your ball:White(cue ball · 1)
Ball 2RedBall 3Yellow
Expected shot:Tüzül Efekare systemRenverséCushion orderLong → Short → Long

The cue ball hits ball 2; on the cushions the spin turns it back and it goes to ball 3.

Given:
SpinSpin 4Arrival7Start12Table value15
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.