| 摘要 |
PROBLEM TO BE SOLVED: To correct the wining rate and odds of a bet unit so as to maintain a payback rate for the respective bet units within the fixed range of a target profit rate even in the case that the rounding processing of the odds is performed. SOLUTION: In this operation method of the game machine, a target payback rate and the wining rates and the odds for respective plural bodies to be drawn are set and the plural bodies to be drawn are ranked in the order of the winning rates. The processing of approximating and correcting the odds of the body to be drawn of a first order to the odds of a prescribed digit number, correcting the winning rate of the body to be drawn of the order based on the odds after correction, reflecting the difference of the winning rates before and after the correction of the body to be drawn on the winning rate of the body to be drawn of the next order and re-deciding the odds of the body to be drawn based on the corrected winning rate of the body to be drawn of the next order are repeated for the bodies to be drawn of all the orders. The difference of the winning rates of the body to be drawn of the lowest order is re-reflected on the winning rates of all the bodies to be drawn based on a prescribed ratio.
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