Perhaps something got lost in translation. The only words I know for "I yield" in Japanese are "maitta" and it's politer equivalent "mairimashita".
I've been thinking this comes from "makeru," which is "to be beaten (in a sporting event)" or "to lose (in a sporting event)".
I understood "maeta" to be s shortened form of "maketa", meaning "I lost" (or "you won").
In fact, I think I remember one of the guys telling me that once, a long, long time ago...