All that follows is based on my experience playing blitz, in particular G3 d0. I rarely play anything else because either I don't have the time or I don't have the patience for slow chess anymore.Nitro how comparable are chess24 ratings to USCF?
I think it depends on the level. Different sites are different misrepresentation of real chess ratings.
In my experience, Chess24.com ratings are probably slightly inflated compared to USCF at the 2000 - 2400 level. Say around 50 ELO too high.
Next is lichess.org. This one is probably 100 ELO under rated at the 2000 - 2400 level.
Finally, I think playchess.com is hugely under represented all the way from 1500-2000, probably 200 - 300 rating points.
It is hard to tell exactly why, but I suspect either bots or bot help on playchess. lichess tries hard to spot engines so they can't sneak in, but the whole thing is silly since a human being can get past the captcha, and then let the engine loose on the site against humans. Chess24 is probably the most accurate, imo.
Another possibility is that strong players are using the sites to coach their students. I do this too. My own (blitz) rating are similar on lichess and chess24 and USCF, but is dramatically lower on playchess. I play blitz at around 2250 - 2300. OccassionallyI beat GMs, and I often beat IMs.
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