Some PBAs use this scoring system to make it "more understandable".
A strike is automatically 30, and a spare is automatically 10 + the number of your initial throw. So if it's 9 and spare it's 19, an 8 and spare it's 18 and so on.
And to keep a prefect game 300, the 3rd throw on the 10th frame is removed.
全く面白くないんだけどー😮😮😮😮