The next level of strategic complexity, between "experts" who would both use the double-cross strategy (if they were allowed to), is a battle for "control": An expert player tries to force their opponent "to open the first long chain", because the player who first opens a long chain usually loses. Against a player who does not understand the concept of a sacrifice, the expert simply has to make the correct number of sacrifices to encourage the opponent to hand him the first chain long enough to ensure a win. "If" the other player also sacrifices, the expert has to additionally manipulate the number of available sacrifices through earlier play.