From the FAQ on tantrix.com: So, since triple intersections only have half the chance of being "forced", they easily clog up players hands as the game progresses. The negative consequences of this caused the removal of the triple intersection tiles from the game in 1993.
van-ness.com
Van Ness, Kurt N. "Tantrix Tiles". van-ness.com. Retrieved 8 October 2017.
