Perhaps one day there will be a finite number of 'perfect' games which cannot be improved upon, and a computer that is set up to play perfectly is compelled to play one of them.

However, chess is nowhere near played out. The computers in this tournament are still making mistakes that cannot yet be identified as such.

There are two different chess engines in each match-up, so there's enough pseudo-randomness, as you call it, in the differences between the engines, to ensure that these games will be relatively unique.

Richard