Originally Posted by Brainiac
I always love it when non-bowlers try to argue about bowling. If you actually knew anything about the sport of bowling you would know that the analogy is spot on. When you bowl in a league you are bowling on a pair of lanes instead of a single lane, and you've got 9 other bowlers throwing their balls in roughly the same area on the lanes.
Just the fact that you are bowling on two lanes instead of one makes it a lot more difficult because you almost always have to play slightly different angles to the pocket on each lane because the lanes aren't identical. Plus, the 9 other bowlers cause the oil on the lanes to move and break down, so you have to anticipate the changes and make slight adjustments (usually by moving your feet a board or two on the approach and/or a moving your target on the lane a board or two to either the left or the right). When the oil breaks down, the ball hooks more.
So to answer your question, No, the pins don't move. But the oil moves A LOT in league play, and it doesn't really move at all in open play.
I have bowled in leagues, and yes there is a difference both physically and mentally. I also played baseball through college and hardball leagues into my late 30's. The comparison between batting practice and bowling practice as it relates to what you face in a game is quite a stretch of the imagination.