by Equinoxe » Fri Jan 06, 2012 8:09 pm
If the new bot is of a much different rank, then the sigma increasing (for example to 16.67, as at the beginning) would, I think, be sufficient to allow the bot's results not to influence too much the other bot's rankings, and to get faster to its true rank.
On the other hand, if the new bot is for example xathis v3, and the system that is used nowadays is used, will perturb every bot it will fight against from the lowest ranks to the highest ones.
So the only change of increasing sigma instead of setting values like at the beginning is that bots will take less time to converge towards their true ranks, and so will less disrupt other rankings.