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Is it possible to have concurrent collision detection where every entity acts at exactly the same time?

There are many algorithms that can be used for collision detection. In many cases we check for an overlap in coordinates of an entity.

If we make a triangle a,b and c. We have 2 entities at a and b heading for a collision at c but each of them are moving at exactly the same time, what kind of algorithm could work?

It seems more like a chess game where you would have to predict every move that the other entity would have to make, if they swerve to the left to avoid a collision will they also run the chance to collide. Is it possible or is it too complex? Would it work for thousands and millions of entities in the same search space?