Jon Peterson is an expert on the history of wargames, and the tabletop role-playing games that they spawned. His books include Playing at the World, on simulated combat from chess to Dungeons & Dragons, The Elusive Shift, on the evolution of role-playing, and Game Wizards, on the legal feuds that shaped the early history of D&D. One of us (Clara) has spent more time than she’d like to ...