Archaeologist Walter Crist uncovered an unexpected clue to Roman leisure while visiting Het Romeins Museum in Heerlen, Netherlands. A small limestone slab in the collection, marked with a geometric pattern, stood out because it did not resemble any known Roman game board.
That discovery led to a detailed study combining microscopic wear analysis with artificial intelligence. Published in Antiquity, the research suggests the stone belonged to a previously unidentified Roman blocking game rather than a race or alignment game.
A board that did not fit the pattern
The artifact, cataloged as object 04433, was made from Norroy limestone and appears to have been repurposed from building material. Its surface shows deliberate carving, along with wear marks consistent with repeated movement of game pieces across the stone.
Researchers found that the scratches were concentrated along specific routes, especially a diagonal line. Those traces became the key to reconstructing how the game may have worked.
AI helps rebuild ancient play
To test possible rule sets, Crist and his team used the Digital Ludeme Project's Ludii platform. The system simulated hundreds of game variations on a digital version of the board, including different piece counts and movement styles. After 1,000 rounds for each setup, the results pointed to one clear match: a game in which one side tries to trap the other.
The reconstructed game, named Ludus Coriovalli, appears to have been asymmetric. One player controlled four pieces, while the other used two. The goal was not to capture in the modern sense, but to block an opponent's movement and outlast them on the board.
The finding pushes the history of blocking games in Europe back by several centuries and suggests that Roman entertainment was more varied than previously documented. It also shows how AI can support archaeology by simulating behavior and comparing it with physical evidence.
Beyond one limestone slab, the study opens a wider window into ancient daily life. It hints that games once played on wood, dirt, or other perishable surfaces may have been far more common than the surviving record suggests. In the future, this approach could help uncover many more lost traditions of play.