I think this is a good thing to have in your back pocket when you want to do an impromptu, modest
effect with no preparation other than borrowed pen and paper. Not sure about adding it to a full set
of routines yet -- I think it's possible that many people could backtrack the technique and realize
that in Tic Tac Toe you can quickly be forced into a particular set of moves in response to a
threat, and that this is what is happening in this demonstration. At the very least, though, I think
it's a good amusement (rather than a miracle) and a good ice breaker. As part of a larger set of
effects, I think it COULD be followed up by another, more mysterious and powerful prediction and
thereby be a great lead-in for the follow up effect.