RTS games like Starcraft only hide information from opponents in a grey shroud while revealing knowledge of the map setup to all players. Areas of conflict are always inside of overlapping Line of Sight.
Thus every player has their own field of Line of Sight which in general differs from that of other players while such fields are allowed to overlap each other. While traditional board games provide perfect information to all participants, Real-time strategy (RTS) games use the fog of war and Line of Sight to keep one players movements and decisions secret from the others unless scouted.
