Kachi-koshi
Kachi-koshi ( Japanese 勝 ち 越 し ) is a positive win record of a sumo wrestler in a basho (tournament).
In these tournaments, fights are always fought with an odd number, so that it can always be clearly stated whether a fighter - a sumōtori - has won more fights than lost, or vice versa. The ranking of the sumōtori depends on how they perform in the tournaments.
If a fighter wins more duels than he loses during a tournament, this is called kachi-koshi and leads to promotion to the banzuke . (There are two exceptions, however: the rank of yokozuna is only obtained after two consecutive tournament victories , and for that of Ōzeki you need 32–33 victories in three consecutive tournaments.)
Since in the highest leagues, the Makuuchi and the Jūryō Divisions, every fighter has to fight a fight on each of the 15 days of the basho, he needs at least eight wins to achieve kachi-koshi . In the lower leagues ( Makushita , Sandanme , Jonidan and Jonokuchi ) there is only seven days of fighting, so at least four victories are required.
The level of kachi-koshi decides how far a fighter is promoted, ie a 9–6 is much cheaper than an 8–7, although it means only one victory more.