Author: Uri Blass
Date: 12:39:21 10/11/02
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On October 11, 2002 at 14:43:30, Vincent Diepeveen wrote: >On October 11, 2002 at 13:52:04, Uri Blass wrote: > >Not really. I just do singular extensions and checks in qsearch >when we talk about this position. It would amaze me >if deep blue didn't use singular extensions, because even >chiptest back in the 80s or something already used it :) > >>On October 11, 2002 at 13:14:55, Vincent Diepeveen wrote: >> >>>On October 11, 2002 at 11:03:19, Uri Blass wrote: >>> >>>DIEP needs 9 ply to see the KRP KRP endgame (so winning >>>the pawn on e5). >> >>You must have a lot of extensions to see it only at 9 plies. >> >>1...h3 2.Rh6 a3 3.Rh8+ Ke7 4.Rh7+ Ke8 5.Rxh3 Ra4 6.Rh8+ Ke7 7.Rh7+ Ke8 >>8.Rh1 a2 9.Ra1 Ke7 10.Ke5 Ra5+ 11.Kd4 >> >>If I count only no check moves I get 14 plies even with checks in the qsearch. >> >>1...h3(1 ply) >>2.Rh6(second ply) >>2...a3(third ply) >>3...Ke7(4th ply) >>4...Ke8(5th ply) >>5.Rxh3(6th ply) >>5...Ra4(7th ply) >>6...Ke7(8th ply) >>7...Ke8(9th ply) >>8.Rh1(10th ply) >>8...a2(11th ply) >>9.Ra1(12th ply) >>9...Ke7(13th ply) >>10.Ke5(14th ply) > >>rest qsearch. > >let me count for you more clear instead of the >above line, of course also extending check escapes: > >h3 1 >rxh6 2 >a3 3 >rxh3 4 >ra4 5 >rh8+ 6 >ke7 7 >rh7+ 7 >kf8 8 >rh1 8 >a2 9 >ra1 10 >ke7 11 >NULLMOVE 12 >qsearch: >ra5+ >something >kxe5 In my line I do not have 1...h3 2.Rh6 a3 3.Rxh3 but 1...h3 2.Rh6 a3 3.Rh8+ Ke7 4.Rh7+ Ke8 5.Rxh3 so it is more plies. > >You see it is trivial that it is 12 ply here without extensions >if you do checks in qsearch. It seems to me 14 plies because Rh8+ Ke7 Rh7+ Ke8 is 2 plies. With using hash tables to prune the tree it may be 12 plies without special extensions Uri
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