When were the laws of the game changed?

[the other bob wilson]

Is the defender just supposed to get out of the way though and allow the attacking player the ball? The same could be said of the old traditional no 9 shielging the ball, holding the ball up while pinning the central defender, jut waiting for an option, a runner etc. That's obstruction as well, although i'd call it good play, strong, intelligent.

The defender is trying to stop the game - unless the attacker is trying to buy a free kick, they’re trying to keep the ball in play.