This is also a fascinating phenomenon. To some of the moves really didn't look random -- but of course there were.
We imprint our own flawed notions of randomness on everything.
I just saw a promotion to a knight.
Just saw it promote to bishop :)
Two bishops here.
It gets boring when there is a few pieces left.. there is hardly any chance random will actually win - it will keep moving around forever.
In the game I watched, I saw two promotions to queens, a knight, and a rook.