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Thanks Jorg, Spearman becomes interesting, I knew I had thought through 3-fold repetition but no saved work. Here'e re-creation and rationale by way of partial proof. As of now, I still see a full 6 as necessary Sovereign Spearman(2.0, 6). Realize Spearman is one of projected 2000 p-ts for here course of 2012, and only a possible million p-ts creatable.  Gilman's being self-described ''comprehensive'' is extremely optimistic. So what's important is the process of either p-vs or in this case Mate#, which may or may not need later computer correction, usually downward, in unlikely event interest develops for some specific embodiment having cheap-piece Spearman right on the piece/Pawn interface; or need to refine Centennial value itself.   Computer being necessary for fixed-form cv, Sovereign Piece-type values are for more generality in different piece mixes and boards at once.