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I think his point was that the game would be using a predictable RNG, which made his whole endeavor possible.

It was sort of an interesting aside from an another aside. There are loads of different ways to write a Tetris Bot, and I've got a few different implementations varying from brute forcing the game tree to using genetic algorithms. But I figured it'd be interesting to see what could be done with perfect prediction of all the future tetrominos.

Randomness is also useful for the integrity of online gambling - knowing what cards are coming next in a high stakes game might not be considered a waste of time.