Quoted from nhm:Nudging is for amateurs. Sliding is where it's at. Much harder to master the slide without tilting. When I play in local tournaments, I always take note of the floor surface. Smooth tile and any polished surface are ideal for sliding. You just have to make sure that you don't slide into the game next to you.
Sometimes at CA tournaments, the legs of the games are taped down to the floor. It was either painters tape or duct tape, and it was on there pretty thick. So the game literally could not be slid around at all. I remember this happening at California Extreme and It Never Drains tournaments.
Nudging was still possible of course, it's just that sliding was largely impossible.