The present invention relates to a slot machine, and more particularly to a slot machine in which winning is so controlled as to occur with a predetermined probability and in which the number of wins to occur is averaged for any given number of games.
In a slot machine, generally a plurality of juxtaposed reels rotating at high speed are sequentially and automatically stopped, or alternatively each of the reels is independently stopped by manipulation of a stop button for each reel. At the time the reels stop, a win decision is made in accordance with the combination of symbols stopped and positioned on a winning line, and coins (including tokens) are paid out in the number that the kind of win indicates.
In such a slot machine, the number of all of the possible combinations of symbols is determined by the number and kind of symbols disposed on respective ones of the reels. Among all of the possible combinations, the number of winning symbol combinations determines the probability of getting a win.
Although the overall win probability is so established, it is natural that the probability of getting a win during a given game is governed by temporal chance while repetitively playing game. Thus, despite the overall win probability, the actual win is generated utterly by chance. This means that there is a substantial possibility for the probability of getting a win in any particular game to vary with time. Therefore, if a large number of wins occur during a certain limited number of games, it is known statistically that the probability of getting a win is decreased during the subsequent interval. As a result, a player playing the game during such a subsequent interval may lose interest in the game because of the reduced chance to get a win.