# Tom Harold (Degnr8) WT
  # Modified by Zawy to be a weighted-Weighted Harmonic Mean (WWHM)
  # No limits in rise or fall rate should be employed.
  # MTP should not be used.
  # adjust=0.99 # 0.98 for N=30, 0.99 for N=60
  k = (N+1)/2  * T * adjust

  # original algorithm
  d=0, t=0, j=0
  for i = height - N+1 to height  # (N most recent blocks)
      # TS = timestamp
      solvetime = TS[i] - TS[i-1]
      solvetime = 10*T if solvetime > 10*T
      solvetime = -9*T if solvetime < -9*T
      j++
      t +=  solvetime * j
      d +=D[i] # sum the difficulties
  next i
  t=T*N/2 if t < T*N/2  # in case of startup weirdness, keep t reasonable
  next_D = d * k / t