I would like to know validity of conditional divorce. Like like for example if a man playing sport like cricket if he condition that if he hits six his wife will be divorced and if he indeed hit six will it come to effect. Second if there are no two witnesses who heard his statement does it also count. If if a person says that I didn't intend to utter this will his words be taken back

No this would not be permissible. He would need two witnesses for divorce to be effective.