 The technical grade attempts to assess only the technical climbing difficulty of the hardest move or short sequence of moves on the route, without regard to the danger of the move or the stamina required if there are several such moves in a row.Technical grades are open-ended, starting at 1 and subdivided into "a", "b" and "c", but are rarely used below 3c.The technical grade was originally a bouldering grade introduced from Fontainebleau by French climbers.