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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: Ball System (볼 시스템)Score 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.
Ball System (볼 시스템)
Ball fraction + Spin = Reference line + Arrival + Slant
Your ball:White(cue ball · 1)
Ball 2RedBall 3Yellow
Expected shot:Ball System (볼 시스템)Ball firstCushion orderLong → Short → Long

The cue ball hits ball 2 first, then travels the cushions in order to ball 3.

Given:
Reference line3Arrival2
In this position, what is Fraction + Spin?

Task: put the given values into the system's formula and calculate Fraction + Spin. Enter the answer as a number; you can use a comma or a point for decimals.