This rule plays tit for tat for 50 moves, defects on move 51, and then plays 5 more moves of tit for tat. A check is then made to see if the player seems to be RANDOM, in which case it defects from then on. A check is also made to see if the other is TIT FOR TAT, ANALOGY (a program from the preliminary tournament), and its own twin, in which case it plays tit for tat. Otherwise it randomly defects every 5 to 15 moves, hoping that enough trust has been built up so that the other player will not notice these defections.