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Hmm. What I do is pre-calculate a whole bunch of points by precise predicting until a few ticks after the second wave has hit. Then I use these points as 'destinations' for my goto algorithm. Each point holds its own danger value, and this danger is the one used if the point is 'reachable', otherwise I calculate a new danger for whatever location the wave hits me at. That way I never run into problems with duplicate points, association etc.