Matarilevich:
Like I said its not written, in my opinion should be because once in the past was allowed...
You right its a bit confuse, and you are not the only one who missunderstood the rules. I've already asked for a more clarified english checkers rules text, but I lost with my arguements and I'm not going to start all over again.
I've helped the Portuguese translator and at least now I know that portuguese players understand better the checkers rules in Brainking.