13 into 9 best min fragment found: 3
  Cut up 13 sticks of length 9 like this:
    6 x (4 + 5)
    7 x (3 + 3 + 3)
  Reassemble as 9 sticks of length 13 like this:
    3 x (3 + 5 + 5)
    6 x (3 + 3 + 3 + 4)