Author: Rafael Andrist
Date: 08:38:51 01/11/03
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On January 11, 2003 at 10:45:14, GuyHaworth wrote: >I haven't studied the Nalimov code but if the 'subgame reverse-inheritance' >phase is changed as follows: > >a) side mated ==> DTC = DTM = 0 >b) stm converts to win ==> DTC = 1 rather than DTM = dm+1 >c) stm forced to convert to loss ==> DTC = 0 rather than DTM = dm > >then Eugene's code generates DTC EGTs rather than DTM EGTs. > >Maybe the EN-program-cognoscenti know where this coding is? Changing the code would not be a problem, but it would be necessary to _generate_ the EGTB again with DTC metric and this means re-generating already existing information. A direct conversion would be much faster. >This seems a safer route to creating the DTC EGTs. If you do not trust the Thompson data, several cross-checks are possible after conversion: 1) win(DTC) = win(DTM) etc. comparing illegal positions is not possible because Thompson metric does not make a difference between draw/illegal. 2) DTM >= DTC 3) running the self-consistency check for EGTB All this together would still be faster than re-generating the database. regards Rafael B. Andrist
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