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Nonsense. That is strange, incorrect comment off the mark in entirety. The demonstration shows under 50 moves White wins with 6 Rotating Spearmen
against Black's best play. That is the whole point or the main point. A Computer or longer trials
can more emphatically confirm it now. This Spearman example should complete way under 50 moves with Black best effort. It may well not even be a 20-mover. Mentioning no Pawn Promotion and over 50 moves for other p-ts as interesting studies is conservative adherence to principle. They do not apply here to Spearman anyway. Cannot Jeremy L. follow the unflawed demonstration? It is not final proof but strong evidence that Mate# is '6' or possibly only '5'. Or is he perceiving an error, which would be welcome input to address? Put it into words regarding Moves 1 through 7 below. The continuation to Moves 8,9, 10 is somewhat obvious by the position of the other Spearmen. The object is to keep Spearman in the piece-type camp with no special favours like given OrthoPawn.

 Also, I will be happy to subject 'For the Crown' to similar scrutiny. I have not really looked at it yet beyond noticing the rules seem well-written. Are there any variant chess pieces there for calculation of these Sovereign Values, the subject of this new thread? Or are they all Orthodox in 'For the Crown'?
Repetition in the Rotating Spearman example is illegal for Black because Black has the two other Moves by common CV rules as well as early history/regional Chess rules. Black cannot absurdly claim a Draw, she must proceed with one of the two legal moves at her disposal Move 7 below. The prospective 3-fold repetition is not forced and play proceeds by equally standard practice to current f.i.d.e dogma. It happens to redound to White's advantage and toward completion of inevitable Mate, establishing Rotating Spearman as Sovereign. That interpretation of 3-fold is century-long problemist strict compliance, as otherwise interpreted inelegant. 
Thanks for the opportunity to extend this summary of the analysis respecting the 12-year-old Centennial Chess p-t, now legitimately Sovereign Rotating Spearman(2.0, 6).