Author: GuyHaworth
Date: 19:07:48 01/07/03
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Always good to hear Marc's EGT news, and KRRPKQ is particularly intriguing. I recall Marc's 'KBBPKR EGDB' of Dec 14, 2002 [and since the reference number of the posting is not including _in_ the posting by the system, I can't quote that and cite the posting more easily]. It doesn't include any line showing a 130-move 'record', so maybe I missed another posting that Marc is referring to. It does show a DTM=150 position where White only restarts the move-count as it clocks up 107/107 on his move 108. I don't know what sort of 'record' this might have been. KRNKNN has the record maxDTC = maxDTZ depth at 243. Among pawnless endgames KQPKQ and KNNKP have maxDTC = 114, and I think KQPKQ's maxDTZ is ~70, recalling Ken Thompson's earliest work. The maxDTZ for KNNKP is not known. As RG has just pointed out, a DTM-minimaxing line does not say anything explicit about the DTZ depth where DTZ == 'Depth to (move-count) Z(eroing) move'. While the minimaxing lines for different metrics (DTM, DTC, DTZ and DTR) often appear to be very similar, I don't think one can make any general inferences that they always are. I guess we can be reasonably confident that the 6-man P-endgames are setting maxDTZ-records, even though we don't know what maxDTZ has been in 3-5-man P-endgames, and don't know exactly what it is in 6-man P-endgames. Maybe this is the record Marc is referring to. [ Incidentally, it is I think easy enough - for a programmer, not me - to change EN's code to the DTC instead of the DTM metric, but I don't think anyone has done it yet. If they have, I'm in the market for KQPKQ DTC. ] What are the '$n' figures after some moves, btw? g
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