Chain - (6/6) Huzzle Puzzle

The Chain is classed as 'death by puzzle' in terms of difficulty. There are 3 solutions to this, depending on which piece is in the middle at the start. The special thing about this puzzle is that it can be solved in three different ways, depending on which of the three pieces is chosen as the middle piece. Solving this puzzle requires an especially subtle working of the pieces, the kind that often leaves the victim struggling in frustration. 

Difficulty: 6/6