Augmented tabletop games support players by sensing the context of game 
figures (i.e., position and/or orientation) and then using this information to 
display additional game information, or to perform game related calculations. 
In our work we try to detect the position and orientation of game figures 
using small, unobtrusive passive RFID tags. In order to localize our 
multi-tagged objects, we use a small movable antenna mounted underneath the 
table to scan the game environment. While this approach is not capable of 
real-time positioning, it achieves a very high accuracy on the order of a few 
millimeters. This article describes our experimental setup, discusses the 
trade-off between speed and accuracy, and contrasts our approach with a 
multi-antenna setup.