Abstract: A system is provided for providing an war game which is configured to dynamically change a range of location information of pieces which is to be transmitted to enemy players, depending on game situation to increase uncertainty of the game about win-or-lose. The system comprises transmitting part for transmitting location information of the opponent player's group of pieces to each of players, wherein said transmitting part comprises changing part for changing dynamically, on receiving move information, to be transmitted to each of players, a range of the location information of the opponent player's group based on the move of said move information and/or said location information of the two or more groups which are updated based upon move information.