There is an exception to the 50-move rule. There are some positions which require more than 50 moves to win, yet have no captures or pawn moves. They are rare, and many players never see such an event in their lifetime. The circumstance is as follows. Suppose a computer study has shown that a particular position can be won in 58 moves (without pawn moves or captures), but not fewer. This is proved because a computer can try out every alternative. Then the case is published (so FIDE can list it for arbitrators). The cases listed by FIDE in 1988 were: