Author: Thomas Blomquist
Date: 08:50:09 08/02/01
Go up one level in this thread
On August 01, 2001 at 04:32:57, Peter Kappler wrote: >On July 31, 2001 at 08:41:17, Robert Hyatt wrote: > >>On July 31, 2001 at 02:19:14, Mark Young wrote: >> >>>On July 31, 2001 at 01:05:53, Bruce Moreland wrote: >>> >>>>[D] 8/4ppbk/p5pp/3pP3/3B4/5P1P/PP3P2/6K1 b - - 0 1 >>>> >>>>My thing got smashed by Ulf Andersson in this position. It wants to play ... g5 >>>>and sticks with it for a long time on a P3/550, like something over a minute, >>>>and it didn't have near enough time to avoid getting creamed. >>>> >>>>I'm pretty sure that ... g5 is dead lost. I'm less sure about ... h5 or ... e6. >>>> >>>>A recent Yace switches away in about 12 seconds on one processor of my quad Xeon >>>>450, and Crafty 18.10 takes 22 seconds to shift away. I'm surprised about >>>>Crafty since I'd thought that it should do better given its knowledge of >>>>majorities. >>>> >>>>Anyone have any other insights? If you would like to tell how fast another >>>>program shifts away from ... g5, please include hardware. >>>> >>>>bruce >>> >>>Fritz 6, ChessTiger 14, GambitTiger 2.0 were the best I tested. All programs >>>changed away from g5 in about 1 sec. Hardware: PIII 1000 Mhz 512K Ram. >> >> >>On my machinek, I get e6 in about 6 seconds. I think the problem here is that >>black ends up with a protected passed pawn and in a piece-less ending, a >>protected passed pawn is generally better than a simple distant majority. >>The opponent can win the isolated passer while the protected passer sticks. >>My evaluation here is -.44 (good for black) after e6. Whether it will win >>that or not is a guess. Ulf is very strong of course... I've played him >>several games as well... > > >Ulf was White in this game. > >I think the outside majority is the real story here, and Black is struggling to >draw, or perhaps just losing. I certainly can't see Black playing for a win. > >Here's a cute line that illustrates the power of that majority: > >1...e6 2 b4 Bf8 3 Bc5 Kg8 4 Bd6! Bxd6 5 exd6 Kf8 6 a4 Ke8 7 b5 axb5 8 a5 +- > >Certainly not a forced line, but amusing. > >-Peter black must stop the majority with 1...Kg8! for example 2 b4 Kf8 3 a4 Ke8 4 f4 e6 5 Bc5 h5... and black is ok. If we took away both bishops then 1...g5 wins. Thomas
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