Author: guy haworth
Date: 06:51:11 01/09/02
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http://chess.jaet.org/endings/ has info on file re the DTM(ate) and DTC(onversion). DTM > 50 does not of course imply DTC > 50, and DTC > 50 does not always imply that some phase is > 50 moves, e.g. in KNNKP or KQPKQ. DTR EGTs, to "Depth By the (k-move) Rule", are eminently computable for up to 5-man EGs ... as I have explained in ICGA v24.3 (Sept 2001), correcting a bug or two in my first note on this subject (ICGA v23.1, March 2000). Sadly, DTR EGTs are not as easy to compute as DTC, DTM or DTZ (Depth to move-count zeroing move) EGTs, which are all equally easy to compute by the Wu/Beal algorithm, so 6-man DTR EGTs are some way off. If you have a position with DTZ > 50, it is highly likely that two infallible players, armed with DTC or DTM rather than DTZ EGTs, will create a game-phase longer than 50 moves ... but remember that it is up to one of the engines to _claim_ that this is a draw. It is not a draw just by virtue of occurring. For those interested in extreme positions, there are obviously positions with DTZ = 50 where the attacker will not minimise DTZ by minimising DTC or DTM. Less obviously, there are positions where the attacker will incur a needless 50-move draw-claim in the 2nd phase by minimising DTZ. G
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