Alright let’s get right to business:
I suggest that instead of fuzzy suggested rankings, we do something useful with the tsumego and use the Elo system to properly judge how hard it’s going to be for someone with a certain rating.
Assign an Elo score to every problem, treat it as a player. If someone fails to solve it, it gains Elo just like a player would; if it’s solved, it loses points.
Whether it’s better to initialize a player’s “tsumego elo” to the overall/overall elo or otherwise, I don’t know. But I do know that the estimated difficulty of lots of problems is completely off the mark.
The obvious benefit? When I tell people to do “x% easy problems, y% medium and z% hard problems for their level”, they will actually be able to use a reliable metric.
Let me know what you think!