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I agree with above that any two is sufficient. But I would argue that the bullet speed is better than the bullet power. Knowledge of the bullet speed and the lateral velocity alone, gives you analog of the linear targeting. Which one can understand without any nonlinear math. It probably also give strong diagonal/linear zone in the segmentation matrix outcome. So maybe lateralSpeed/bulletSpeed is sufficient.

I am using only BFT out of 3 choices in Cb's list. Now I see why I am at the bottom of the ranking :) From other hand, many bots would change something in their motion within fixed number of tics, so BFT lets you gauge if it is going to happen or not within the flight time.