games are calculated in advance, then the gameviewer shows the game. This means that a player who is sold 15 minutes before the game starts will not play in the game, and when he is sold during the game, he will play the entire game.
I'm unsure what happens if he is sold during the 15 minutes before the game, but I'd guess he still plays, I think the calculator will take all info he needs at about 15 minutes before game-start, and then uses that info for everything he needs to calculate for the game...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.