in go-moku, there are no captures, so running out of room might be more of a problem. I wouldn't know because I do not play the game, because I find it to be a poitnless and tedious game. In pente, with 5 captures ending the game, running of room is very unlikely. Is it more likely if the starting piece is not in the center? Sure, but it would be a concern for both sides, so I don't think it is a factor even then.