what is the difference between primecoin and riecoin?
There is of course the different PoW (Cunningham Chains vs Prime Constellations for Riecoin), the most obvious change in practice is that Primecoin is GPU mineable while Riecoin is mined with CPUs. Then there are several parameter changes, like 1 minute average block time for Primecoin and 2.5 minutes for Riecoin, different block reward system, etc. The communities are also pretty distinct with their own visions and goals.
Is there discord?
As far as I can see all pools on 16. Fork is to rev 20. Is 20 only solo right now? Please give some more information of fork?
Discord invite:
https://discord.gg/2sJEayCUpdated pool information can be found here.
https://riecoin.dev/en/PoolsPrimaPool is the first 0.20 ready pool.
XpoolX is also 0.20 ready, though it still has the old version too.
You can get some info in the news about the fork.
https://riecoin.dev/en/News/Riecoin_Core_0.20.0_RC_and_rieMiner_0.92_releasedIt was from almost 2 months ago and the hard fork is unfortunately delayed due to several actors being unable to upgrade quickly.
Currently the fork is mainly on the pools' hands. 0.20 stable with a Mainnet hard fork block cannot be released until most pools and their miners have upgraded (most of the solo miners already upgraded to 0.20RC).