Author: Robert Hyatt
Date: 19:45:58 10/10/01
Go up one level in this thread
On October 10, 2001 at 20:13:27, Dann Corbit wrote: >On October 10, 2001 at 08:30:26, James T. Walker wrote: > >>On October 10, 2001 at 05:51:07, Uri Blass wrote: >> >>>On October 10, 2001 at 04:36:47, Jouni Uski wrote: >>> >>>>[D]5r1k/4R2P/8/5BK1/8/8/8/8 w - - 0 96 >>>> >>>>Crafty evaluates +8, but plays draw after 50 move rule! I have here only 4 piece >>>>TBs. >>>> >>>>Jounu >>> >>>I believe that crafty has not the relevant knowledge(I do not know if there are >>>programs that have it). >>> >>>I have an experience from a tournament game when I drew a game in a similiar >>>position when my opponent had bishop and pawn adavntage. >>> >>>I think that the relevant knowledge should say that KRBP vs KR usually win when >>>the only exception is when the bishop is the wrong bishop(does not control the >>>corner promotion square) and the pawn is on the 7th rank. >>> >>>In this case the evaluation should be closer to draw because I believe that at >>>least in big part of these cases it is a draw. >>> >> >> >>While playing Gambit Tiger 2.0 vs Junior 7.0 I had the same type position show >>up. >>[D]4r2k/1R5P/6BK/8/8/8/8/8 w >> >>It ended with the 50 move rule with the black rook chasing the white rook around >>the board trying to make white capture the rook. > >It seems to me (for both positions) we ought to be able to end up with a >position like this: >[D]2r3Rk/7P/7K/8/8/1B6/8/8 w - - >which is a clear win. > >What prevents it? This is an easy and obvious one. The second you play Kh6, I start directly attacking your rook with mine. If you take, I am stalemated. If you don't, you lose the rook. Otherwise, I always hold a r-anywhere check in reserve to drive your king off of h6 if you try to double protect g8 and go for the check there, then I can take on h7 if the rook checks at g8, and any other rook check meets with the same response to reach a drawn KRB vs KR ending. I have seen these types of positions many times. And they are a real problem, because it takes a very deep search to find the perpetual with the "great kamikazie rook" theme...
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.