Productive vs Stretch

I can’t swear these exact values are correct, but this sheds some like on the dividing lines between TR’s Difficulty Level assignments:

  • Achievable = 1.0 to current PL
  • Productive = 0.1 to 1.0 higher than current PL
  • Stretch = 1.1 to 2.5 higher than current PL
  • Breakthrough = 2.6 to 4.5 higher than current PL
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