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A ‘rope’ formed of 2 strands which the leader is tied into but, unlike twin ropes, two seconds may each be tied into just one of the strands. The leader clips only one strand into each runner so as to reduce drag. Half rope is recommended for mountaineering and long ascents where abseil descent is necessary. It is equally preferable whenever belays are less than perfect, notably when ice climbing, because with just one strand clipped, you reduce the shock load in case of a fall. In addition they offer better protection against stonefall or falling on an arete; to limit the drag, and thus the fall factor, you can clip the the strands separately.
