Drawing by repetition is not a too frequently used method, but it has produced some remarkable finishes. It implies an equilibrium of forces, in which both players are compelled to draw because they have no better line of play. The position below is a good example.
It is White's turn to move, Black threatens 1...Rxf1+, 2.Kxf1 Rd1 Mate. Because of this variation, White decides to unpin his Rook:
(Notes by Fred Reinfeld)