Author: Uri Blass
Date: 00:51:38 01/16/06
Go up one level in this thread
On January 16, 2006 at 02:20:29, Tony Werten wrote: >On January 15, 2006 at 08:32:20, Marc Bourzutschky wrote: > >>On January 15, 2006 at 05:30:18, Tony Werten wrote: >> >>>On January 14, 2006 at 14:25:38, Marc Bourzutschky wrote: >>> >>>>On January 14, 2006 at 13:15:20, Mark Rawlings wrote: >>>> >>>>>On January 14, 2006 at 08:59:29, Marc Bourzutschky wrote: >>>>> >>>>>>kqnnkqn, while generally a draw, contains positions that require up to 282 moves >>>>>>to capture or mate. This brings it very close to the current record holder >>>>>>krrnkrr which requires up to 290 moves. kqnnkqb looks to be in third place now >>>>>>with 272 moves, but that database has not yet been verified. kqnnkqn took about >>>>>>8.5 days to generate on a 3.8 GHZ Pentium machine, using Yakov Konoval's >>>>>>program. >>>>>> >>>>>>Note that play after the capture on move 282 will not be the same as would be >>>>>>obtained from a Nalimov database, because the latter maximizes distance to mate >>>>>>rather than distance to mate or capture. >>>>> >>>>>So, in other words, if the Nalimov database was computed for this, it may be a >>>>>mate in greater than 288, however there would be a capture in < 282, if I >>>>>understand correctly? >>>> >>>>All we know is that for a Nalimov database the mate would be in >= 282 moves. >>>>If the mate is in > 282 moves, than there must be a capture in <= 282 moves. >>> >>>I think you are wrong here. >>> >>>There are basicly 2 possibilities. The Nalimov egtb says <=282 or it says <282 >>>:) >>> >> >>No, the Nalimov result is _guaranteed_ to be >= 282 moves. > >I don't understand, DTC is non optimal. DTM is optimal, but not always correct. >So DTM should be <= DTC 1)DTC is non optimal to mate but 282 moves is distance to capture and not to mate. 2)DTC is non optimal for mate for both sides so even if you look at the distance to mate based on the suggested line you cannot know if it is more or less moves than the shortest mate. > >>Note also that the >>50 move rule is ignored in both this and and the Nalimov database. > >? > >Why don't you set the result to draw when DTC>50 ? > >Tony probably because he is not interested in the result of best play in chess but in the result of best play in a game that is similiar to chess that does not include the 50 move rule. Uri
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