This planning has a horizon of typically 1-3 months. The idea is that there are two players, User and Programmer. The tokens are the user stories, written on file cards. There are various moves the players can make, depending on the phase. Understand what the system is to do, well enough that it can be estimated.
User writes and manages stories.
Continue until all stories wanted for the planning phase are estimated. Working set of estimated stories. Write a Story Usually on their own, but perhaps because the Programmer suggested one. If the programmers don't understand it or can't estimate it. Toss a Story Because it's no longer wanted or because a split story covers it.