Author: Tony Werten
Date: 23:23:02 01/15/06
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On January 15, 2006 at 07:14:13, Uri Blass 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 >>:) >> >>Suppose the Nalimov line is correct (wrt 50 move counter). DTC might try to >>capture all oponent pieces missing a shorter mate and needing more moves. It >>will never need less moves. result: Nalimov <=282 > >You miss the fact that based on DTC the line is 288 moves. >The first capture is after 282 moves and this is the reason for the title. I see. I overlooked the 288 and 282 difference. Thanks, Tony > >We do not know if the distance to mate is smaller or bigger than 288 moves >because it is possible that without capture white can mate earlier(less than 288 >moves) and it is possible that by allowing a capture at move 260 black can lose >later and be mated only in 290 moves. > >Uri
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