Author: Uri Blass
Date: 03:25:19 11/05/02
Go up one level in this thread
On November 05, 2002 at 06:00:47, Sune Fischer wrote: >On November 05, 2002 at 05:12:25, Uri Blass wrote: > >>On November 05, 2002 at 04:28:59, Sune Fischer wrote: >> >>>On November 05, 2002 at 00:39:31, Will Singleton wrote: >>> >>>>White to play, bm is d7. How long until your engine shows a positive score? >>>>(amd 1.6ghz). >>>> >>>>Amateur ply 15 score 33 secs 212 >>>>Yace ply 15 score 9 secs 103 >>>>Crafty ply 16 score 40 secs 69 >>>>Ruffian ply 12 score 51 secs 5 (just amazing) >>>> >>>>[D]5kb1/6pp/p2P1p2/1p6/2r5/P1r2N1P/6P1/2R2RK1 w - - 0 36 >>>> >>>>(remember, d7 must show a positive score) >>>> >>>>-------------------- >>>> >>> >>>Yeah man, Frenzee: d7 in 0.00 secs with a positive score :) >>> >>>2 -614 0 66 1.g3 Rxc1 2.Rxc1 Rxc1+ >>>2 -416 0 152 1.d7 Rxc1 2.Rxc1 Rxc1+ >> >>no the score is negative. > >Yeah, at ply 2, but it reaches ply three and four in 0.00 secs also with >positive score :) >Ply 2 is the first iteration, so it will have a lot of fail highs at ply 2 >typically, almost random move ordering of course. My first iteration is ply 1. Why do you use ply 2 as the first iteration? > >>It seems that Frenzee does not do pawn promotion in the qsearch. > >Right, not if they aren't captures, but I'm change this as we speak actually :) > >>My qsearch detects 1.d7 Rxc1 2.d8Q so I have not this stupid line. >> >>Movei's buggy version can show positive score for d7 after search only at depth >>13. > >Well I get it at ply 3, _three_! :) > >>depth=13 +0.37 d6d7 f8e7 c1d1 e7d8 f1e1 g8f7 f3d4 c3c1 d1c1 c4d4 c1c6 f7c4 g1f2 >>d4d2 f2g3 d8d7 c6a6 >>Nodes: 19739458 NPS: 160353 >>Time: 00:02:03.10 >> >>depth=14 +0.27 d6d7 f8e7 c1d1 e7d8 f1e1 g8f7 f3d4 c3c1 d1c1 c4d4 c1c6 d8d7 c6a6 >>d4a4 e1d1 d7e7 a6b6 a4a3 d1e1 e7d7 b6b5 >>Nodes: 34345849 NPS: 161993 >>Time: 00:03:32.02 >> >> >>>2 -386 0 256 1.Nd2 Rxc1 2.Nxc4 Rxf1+ 3.Kxf1 Bxc4+ >>>2 -60 0 365 1.Ra1 Re4 2.axb4 >>>2 -49 0 430 1.Rxc3 Rxc3 >>>3 25 0 600 1.Rxc3 Rxc3 2.d7 Rxa3 >>>3 144 0 1342 1.d7 Rd3 2.Rxc4 bxc4 >>>4 145 0 2889 1.d7 Ke7 2.Rxc3 Rxc3 >> >>White is a pawn down after d7 Ke7 Rxc3 Rxc3. >> >>I think that it is a mistake to give more than a pawn bonus for a pawn in the >>7th. > >May be, maybe not, depends on the position :) >Guess it is a little lucky here, but according to my observations pawns >promoting is quite often the deciding factor in practical games, so no I don't >consider a pawn too much, in particular when backed up by rooks like here. > >-S. I can also see cases when pawns are trapped in the 7th rank. I agree that pawns in the 7th should evaluated as more than regular pawn but I think that bonus of more than one pawn is more than enough. There are cases when it helps but the average result is negative. Uri
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