Control :  Experiment 0                   (click on picture below to see simulation)

This experiment has no competition between populations, in order to see the effects of natural mutation as a control.
The Blue, who is Kasparov (the objective maximum by our loose standards), drifts down because any mutation will make Kasparov worse.
The Red, who is me (the objective minimum by personal deprecation), drifts up since mutation is bound to make me better (hence the optimistic, "it can't get worse than this"). 
Mutation Bias is simple the tendancy of mutation to improve the worse and corrupt the best.

Now we consider the loss of gradient, when populations are too far apart to provide good competition.

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