NB: If you think he underestimates stockfish Elo, then you should think he underestimate Random Elo, because the algorithm finds Elo gaps not absolute Elo.
Not if the ELO algorithm isn’t run to completion. It takes a long time to make large gaps in ELO, like between stockfish and Random, if you don’t have a lot of intermediate players. It’s hard for ELO to different between +1000 ELO and +2000 ELO—both mean “wins virtually all the time”.
Good point, I should look into this more.
NB: If you think he underestimates stockfish Elo, then you should think he underestimate Random Elo, because the algorithm finds Elo gaps not absolute Elo.
Not if the ELO algorithm isn’t run to completion. It takes a long time to make large gaps in ELO, like between stockfish and Random, if you don’t have a lot of intermediate players. It’s hard for ELO to different between +1000 ELO and +2000 ELO—both mean “wins virtually all the time”.