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Yup, it was the result of a genetic tuning =) I'll try with using both Diamond and Tomcat next, possibly adding a time attribute in to improve the rolling.

I'm curious, are you using WaveSim for the genetic tuning, or full robocode battles? It would be a lot faster to use things like WaveSim, but on the other hand I consider WaveSim bad for testing against surfers.

I hacked up my own version of WaveSim which does just the bare basics. It took about 80 seasons with a population of 30 to converge to a final set of weights. I agree, using a fixed dataset to simulate an adapting target isn't really ideal, but the speedup is just phenomenal and as PEZ said, it seems to work :-)