Another option is the algorithm KGW (Kimoto Gravity Well)
http://bitcoin.stackexchange.com/questions/21730/how-does-the-kimoto-gravity-well-regulate-difficulty
This regulates difficulty.
If the difficulty goes up and left there, this algorithm regulates the difficulty after some time and lowers it.
For example if the difficulty is 20 and prohashing leaves, the network will lower the diff e.g. after 10 minutes to 15, then in next 10 minutes to 10, then after 10 minutes to 5 etc.
I am not sure how it works, but I found some coins who work this way.
In the above link someone wrote:
The goal is to have a more adaptive way of adjusting the difficulty instead of just averaging the last 2016 blocks like bitcoin. This is needed because of multipools which might switch the coin they are mining, and a sudden change in hashrate can occur (both increasing or decreasing). Especially when a multipool switches away you get stuck too long with a too high difficulty.
Hi bitkokos2
Thanks for your assistance
I've opened an account with www.miningrigrentals.com. We can put any amount of power in straight away now.
I tested it this morning and it works fine. We won't allow another 24 hour jam to happen again.
We have a healthy budget now for GCN since we sold the old name. There will be a lot going into www.gfile.us
and various other projects. We have already been approached by investors interested in Gfile.
We're expecting to build a 120TB server very soon.
Lots going on
best
Greg