Author: Uri Blass
Date: 22:32:48 01/15/06
Go up one level in this thread
On January 16, 2006 at 01:18:14, Keith Ian Price wrote: >On January 16, 2006 at 00:57:35, Uri Blass wrote: > >>The reason is simple. >>It is known that many programs simply evaluate repetition as a draw and rybka is >>one of them(many programs are going to see a draw in the same conditions). >> >>It is the simple solution to the problem of avoiding repetitions. >> >>programs of course can evaluate only 3 time repetition as a draw but it may >>cause them to search bigger trees for no good reason so it is not clear if it is >>better for playing strength. >> >>programs that evaluate first repetition not as a draw may waste time by allowing >>repetitions and in some cases it even may cause draw by the 50 move rule because >>in superior position they may not be able to be lucky to find the right plan on >>time when avoiding repetition may force them to find the right plan if they >>evaluate first repetition as a draw. >> >>I choose to evaluate first repetition as a draw because when I have 2 options >>when it is not clear which one is better I prefer the simpler option. >> >>Uri > >Well, I thought that might be the case, but why does the 32-bit version evaluate >it as losing, while the 64-bit version thinks it's a draw. And should the >program evaluate a non-forced repetition as a draw, if it is so far behind? > >kp I do not know Rybka 1.0 beta 32-bit see a draw when it get the game and not losing score for black. Maybe latest 32 bit version is different. Deep Shredder 9.02 x64 - Rybka 1.0 Beta, Blitz:16' 2005 b1r1qn1k/1rb3p1/2p1p2p/2N1P3/1P1P4/R2B1N2/3Q1PPP/2R3K1 b - - 0 1 Analysis by Rybka 1.0 Beta 32-bit: 43...Rbb8 = (0.00) Depth: 3 00:00:00 43...Rbb8 = (0.00) Depth: 4 00:00:00 43...Rbb8 = (0.00) Depth: 5 00:00:00 43...Rbb8 = (0.00) Depth: 6 00:00:00 43...Rbb8 = (0.00) Depth: 7 00:00:00 43...Rbb8 = (0.00) Depth: 8 00:00:00 1kN 43...Rbb8 = (0.00) Depth: 9 00:00:00 1kN 43...Rbb8 = (0.00) Depth: 10 00:00:00 2kN 43...Rbb8 = (0.00) Depth: 11 00:00:00 3kN 43...Rbb8 = (0.00) Depth: 12 00:00:00 7kN 43...Rbb8 = (0.00) Depth: 13 00:00:01 12kN 43...Rbb8 = (0.00) Depth: 14 00:00:01 18kN 43...Rbb8 = (0.00) Depth: 15 00:00:01 28kN 43...Rbb8 = (0.00) Depth: 16 00:00:02 48kN 43...Rbb8 = (0.00) Depth: 17 00:00:03 85kN 43...Rbb8 = (0.00) Depth: 18 00:00:04 148kN 43...Rbb8 = (0.00) Depth: 19 00:00:05 250kN 43...Rbb8 = (0.00) Depth: 20 00:00:06 402kN (, 16.01.2006) Uri
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