Author: GuyHaworth
Date: 09:54:42 01/16/06
Go up one level in this thread
DTM == Depth to Mate:
an SM-/SM+ line by definition minimaxes DTM
DTC == Depth to Conversion, i.e., to force-change and/or mate
DTC =< DTM
an SC-/SC+ line by definition minimaxes DTC
in such a line, 'moves to mate' may be <> DTM ... it all depends
DTZ == Depth to (Move-count) Zeroing (move),
i.e. to P-push and/or force-change and/or mate
DTZ =< DTC =< DTM
an SZ-/SZ+ line by definition minimaxes DTZ
DTZ50 = DTZ except when the defender can invoke a draw under the 50-move rule
it is assumed the defender will invoke a draw if the chance occurs
DTZ50 >= DTZ if the game remains decisive
an SZ50-/SZ50+ line by definition minimaxes DTZ50
In a recent paper by MB, JTamplin and self, we show that there are positions
where no SC-, SM- or SZ-optimal move can retain the win in the presence of a
50-move rule. We also showed the impact of the 50-move rule on 6-man P-less
endgames with respect to the number of delayed wins (SZ50 > SZ) and the number
of denied wins (SZ50 = draw when the position is otherwise decisive).
g
g
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