In this blog post, Cory Foy explains how he recreated Scrum using Kanban coupled with a set of Explicit Policies. Kanban has less initial rules than Scrum, but the team decides with explicit policies how he wants to manage things like the frequency of the meetings with the backlog owner. The blog post describes the right set of explicit policies needed in Kanban to recreate Scrum. As Cory Foy says, this is a little bit a silly exercise, but it allows also to think about the implicit set of policies that Scrum proposes.