I've always wondered how far in advance people take the tetriminos into consideration, when they're playing fast, e.g. in a sprint game. I always have the first 'next piece' in mind as well as the hold-piece. If I'm concentrating I can also take the second tetrimino in line into consideration, but any more than that I start having trouble mantaining focus on the stacking. I was wondering if players more skilled than me take more tetriminos into consideation, and if so, if there's a good way to train it?