But one peculiarity of sumo is that wrestlers need a majority of wins at the 15-match tournaments in order to retain their rank and income. This sometimes leads to asymmetries of interests, when a wrestler with a 7–7 record faces an opponent with 8–6 or better. The outcome means a great deal to the first wrestler and next to nothing to the second. In such cases, the number-crunching uncovered, the wrestler who needs the victory is very likely to win.