Author: Richard Pijl
Date: 15:59:54 04/22/03
Go up one level in this thread
On April 22, 2003 at 04:49:08, Richard Pijl wrote: >On April 21, 2003 at 18:24:45, Drexel,Michael wrote: > >>On April 21, 2003 at 18:09:03, Uri Blass wrote: >> >>>On April 21, 2003 at 17:18:46, Robin Smith wrote: >>> >>>>On April 20, 2003 at 17:20:11, Uri Blass wrote: >>>> >>>>>It may be possible to use it in a productive way to avoid problems >>>>>that I mentioned(the program prefers loss by KR vs KPPP and not drawn KR vs KPP) >>>>>by having rules to trust tablebases scores only in part of the cases but I do >>>>>not like it. >>>> >>>>Uri, >>>> >>>>I know such things are possible in theory. Can you give an example of it >>>>actually happening? >>>> >>>>Robin >>> >>>No >>>If I remember correctly I saw a case when it happened but >>>I did not care to save the position and I do not plan >>>to look for it now. >>> >>>Uri >> >>[D] 8/8/8/7P/4K1P1/r6P/k7/8 b - - 0 1 >> >> >>Anaconda 1.0 lost this position with tablebases. >>It would take the pawn without. >> >>Michael > >The Baron 0.99.6 b7a (the newest I have on this computer :-( ) solves it with >3,4 men EGTB, giving a draw score soon: > > ply time nodes score pv > > 5(10). 0 11535 135 a3h3 e4e5 a2b3 e5d4 h3c3 > 6(10)& 0 15996 101 a3h3 e4f5 a2b3 f5g6 b3c4 g4g5 > 6(12). 0 46457 101 a3h3 e4f5 a2b3 f5g6 b3c4 g4g5 > 7(11)& 0 53795 108 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 b3c4 > 7(14). 0 142688 108 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 b3c4 > 8(12)& 1 164252 77 a3h3 e4f5 h3h4 f5g5 h4h2 g5g6 h2d2 g4g5 d2d6 >g6f7 d6d7 f7f6 d7d6 f6f5 d6d5 f5g6 d5d6 <rep> > 8(15). 2 426745 77 a3h3 e4f5 h3h4 f5g5 h4h2 g5g6 h2d2 g4g5 d2d6 >g6f7 d6d7 f7f6 d7d6 f6f5 d6d5 f5g6 d5d6 <rep> > 9(14)& 2 482290 59 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 c3c6 g6f5 c6c5 >f5f6 b3c4 > 9(18). 6 1083704 59 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 c3c6 g6f5 c6c5 >f5f6 b3c4 > 10(17)& 7 1213655 41 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 c3c7 h5h6 b3c3 >g6f6 c7h7 > 10(19). 14 2478991 41 a3h3 e4f5 a2b3 f5g6 h3c3 g4g5 c3c7 h5h6 b3c3 >g6f6 c7h7 > 11(19)& 16 2823787 35 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 h3c3 >g6f6 c3c6 f6f5 c6c5 f5f6 c5c6 <rep> > 11(20). 30 5396645 35 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 h3c3 >g6f6 c3c6 f6f5 c6c5 f5f6 c5c6 <rep> > 12(22)- 72 12790151 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 h3c3 >h6h7 c3c8 g6g7 c8c7 g7g8 c7c8 g8g7 <rep> > 12(22)& 72 12829997 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 h3c3 >g6h5 c3h3 h5g6 <rep> > 12(22). 72 12830012 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 h3c3 >g6h5 c3h3 h5g6 <rep> > 13(23)& 80 14197935 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 d4e5 >g6g7 e5f5 h6h7 f5g5 > 13(23). 124 21396295 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 d4e5 >g6g7 e5f5 h6h7 f5g5 > 14(24)& 171 29094631 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 d4e5 >g6g7 e5f5 h6h7 f5g5 > 14(25). 260 43359685 0 a3h3 e4f5 a2b3 f5g6 b3c4 h5h6 c4d4 g4g5 d4e5 >g6g7 e5f5 h6h7 f5g5 > > >Richard. Now I'm home I rerun it with the latest version and 5 men EGTB. Baron 0.99.6 b8 immediately selects Kb2 with a draw score (and after 1..h6 2.Rxh3). Run without EGTB's Baron selects Rxh4 immediately and a draw score after 16 seconds (which is comparable to the results with the 4 men EGTB as that was run on a much slower computer). Baron knows that rooks are quite bad at stopping connected passers, so I guess this result is knowledge based. Richard.
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