2024 marks the 50th anniversary of the publication of Dungeons & Dragons. Nailing down the exact release date of a product as informally produced as D&D is difficult: I've written about that before (and amended it a bit further). Personally, I still choose to celebrate it on the last Sunday of January, which this year is the 28th. A lot of things will be happening in 2024 to mark D&D's birthday: among them, a re-issue of my first book, Playing at the World. But 2024 also marks another momentous occasion, one that we should honor along with D&D's release: the 200th anniversary of the 1824 publication of Reiswitz's Kriegsspiel, the game that pioneered many fundamental system concepts that would later underpin role-playing games.