Author: Uri Blass
Date: 12:46:07 10/27/02
Go up one level in this thread
On October 27, 2002 at 15:20:51, Roy Eassa wrote: >On October 27, 2002 at 14:54:02, Uri Blass wrote: > >>On October 27, 2002 at 13:57:46, Roy Eassa wrote: >> >>>On October 27, 2002 at 11:46:12, Sune Fischer wrote: >>> >>>>On October 27, 2002 at 00:52:27, Uri Blass wrote: >>>> >>>>>On October 26, 2002 at 18:35:30, Yatheen Manicka wrote: >>>>> >>>>>>It seems to that the recently completed match in Bahrain has made things much >>>>>>more difficult for Kasparov in his match v Deep Junior in December. >>>>>>Deep Fritz demonstrated through trial and error how to play "anti-human" chess >>>>>>vs a GM, eg.,keep queens on the board and avoid positional maneuvering. >>>>> >>>>>I do not believe that it is possible to >>>>>keep queens on the board and avoid positional maneuvering. >>>>> >>>>>Kramnik demonstrated mistakes that are not typical for him. >>>>> >>>>>In the match against Fritz he did 2 mistakes of one ply. >>>>>losing a piece and sacrificing a piece. >>>> >>>>Why do you call the sacrifice a 1 ply mistake? He thought about that move >>>>for 45 minutes. He took a chance, he had already shown he was superior in the >>>>quiet positions, I think he got bored and wanted to show he could play some >>>>exciting chess, and do it better then fritz too! >>>> >>> >>> >>>I agree, it was not a 1-ply error. >> >>It is dependent on the definition of 1-ply error. >> >>The point is that I understood that based on investigation of kramnik's games at >>120/40 the only case when he did something similiar was against anand. >> >>So one of the following: >>Kramnik did one 1 ply error when in the previous 100-200 games he never did it >>against humans. >> >>Kramnik did two 1 ply errors and in the previous 100-200 games against humans he >>did only one 1 ply error. >> >>Uri > > >In game 5 he made a 3-ply (not counting the move itself) error when he blundered >the piece. In game 6, instead of playing a fairly obvious move that would >probably win, he made a sacrifice that proved to be incorrect but cannot be >considered a 1-ply mistake because the refutation is a LOT deeper than that. I >understand that in the game against Anand he also made an unsound sacrifice with >a refutation much deeper than 1 ply -- but perhaps in that game he was losing >anyway? > >In any case, I guess your definition of a 1-ply mistake eludes me. I would >think it would mean the move leads to irrecoverable loss of significant material >(without compensation) or gets checkmated on the very next move by the opponent. > A 3-ply error would mean the oppenent acquires the large advantage (material or >mate) 3 ply after your error, etc. My definition of 1 ply error is an error that computer can see a big change in the score based on a search of one ply. The mitsake of kramnik in game 5 was 1 ply error because after the mistakes programs can see in 1 ply that kramnik is losing a piece(they search the first move check and extend after the moves because they extend checks and after it they go to qsearch but it is enough for them to see that kramnik is losing a piece. The mistake of kramnik in game 6 is also 1 ply error because programs can see big change in the score based on search of 1 ply. I do not agree that the refutation is more than 1 ply. Programs usually evaluate from the first ply that the sacrifice is wrong. Playing sacrifices for the beauty and not because they are correct is a mistake of weak players and not of players at the level of kramnik. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.