Queen's Guard Implemented by Karl Scherer, December 2000.
Moves are one step onto any empty adjacent hexagon.
Moves are either sideways in the same ring around the centre or into the next inner ring. There is no capturing. A piece placed at the centre is trapped when two enemy pieces are placed on two opposing sides. If the Queen and a Guard are trapped at the same time, then the Queen must be moved first. A Guard may never enter the centre.