For example, if one cuts and the other picks, but only if the crooks are about even in size and strength and reputation and so on, so that neither has an unfair advantage, and able to put pressure on the cutter or picker. But if there is an unfair advantage then the whole system goes to hell without a crooked intermediary who is average in strength or bigger than both. An alternative method is also the equal cuts and picks method, described in Orson Scott Card's Ender's Game which involves one person cutting and then the other person cutting and picking. Read Ender's Game for more details.