At any time there must be a minimum of two wrestlers ranked as "komusubi". If circumstances require this can rise to three or four, for example if both "komusubi" have winning records and an upper "maegashira" produces such a good score that he cannot reasonably be denied a promotion. However, this is relatively rare. The minimum of two requirement means that a certain amount of luck can lead to wrestlers achieving this rank on occasion, if the performance of other wrestlers leaves no obvious candidates to fill the rank.