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Ideal Values and Practical Values (part 3). More on the value of Chess pieces.[All Comments] [Add Comment or Rating]
Michael Nelson wrote on Fri, Jul 18, 2003 08:47 PM UTC:
Peter brings up an interseting observation about Rook values approximating
empty board mobility.  Yet the short rooks seem a little weak by this
standard, just as the usual crowded board mobility makes long Rooks too
weak.  

The Rook's special advantages over the Bishop and Knight (interdiction,
can-mate) are endgame advantages--so empty board mobility or at least a
higher than normal magic number might be the way to quantify the value of
different length Rooks among themselves. An R7 is much superior to an R3 
in both can-mate and interdiction. And Rook disadvantages (lack of
forwardness, hard to develop) apply regardless of length so they would
cancel out in this comparison.