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Harm, let me then focus on your method to have one engine play itself other using different armies: I am convinced - so please correct me if need be - that your engine has implemented just that value scheme, you are talking about. Suppose, that true values probably are somehow different from the built in figures. Then your engine will throw away underestimated pieces too cheap and keep overestimated too dear. Thus it will start and avoid a lot of trades in unjustified manner. And the bad payload for this is, that you are not able to detect it, because equal engines are blind to penalize each other for such mistakes. And in the end therefore such tests tend to become a self fulfilling prophecy.