Author: Uri Blass
Date: 09:03:18 02/17/02
Go up one level in this thread
On February 17, 2002 at 11:43:09, Christophe Theron wrote: >On February 17, 2002 at 11:34:40, Christophe Theron wrote: > >>On February 17, 2002 at 05:43:22, Uri Blass wrote: >> >>>On February 17, 2002 at 05:21:47, Ed Schröder wrote: >>> >>>>On February 17, 2002 at 04:55:13, Steffen Jakob wrote: >>>> >>>>>Here is another position which is easy to solve for humans. In a blitz game >>>>>between Hossa and Arasan the following position was on the board: >>>>> >>>>>[D]8/8/4B2p/2K5/r5P1/p5k1/Rb6/8 b - - 7 116 >>>>> >>>>>For humans it's rather easy to see that 117... Rxg4 wins without any problems >>>>>because the white rook is totally paralyzed. Unfortunately Hossa wasn't able to >>>>>see this in the blitz game. So the game continued until the 50 moves rule forced >>>>>Hossa to take the bishop and finally to win the game. >>>>>Which engines find 117... Rxg4 in which time? >>>> >>>>Easy for comps too :) >>>> >>>>2 secs for RC4 >>>> >>>>Ed >>>> >>>>============================================================== >>>> >>>>00:00:02.1 1,88 9 449751 Re4 Kd6 Re3 Bf5 Kf4 Be6 Re5 Bd7 >>>>00:00:02.1 1,88 9 817955 Rxg4 >>>>00:00:02.1 2,09 9 835992 Rxg4 Bxg4 Kxg4 Kd5 h5 Kd6 h4 Kd5 >>>>00:00:03.3 2,17 10 1122788 Rxg4 Bxg4 Kxg4 Kd5 h5 Ke4 h4 Ke3 >>>>00:00:04.5 2,01 11 2027319 Rxg4 Bxg4 Kxg4 Kc4 h5 Kd3 Kf3 Kc4 >>>>00:00:34.6 3,62 12 31107270 Rxg4 Bd7 h5 Bc6 Rf4 Kb5 h4 Ka5 >>>>00:00:44.1 3,82 13 41624594 Rxg4 Bd7 h5 Bc6 Rf4 Bb5 >>> >>> >>>Trivial for Deep Fritz >>> >>>It knows that opposite color bishops with one pawn advantage gives good chances >>>for a draw so it's only choice is to sacrifice the rook by evaluation. >> >> >>Where do you see an opposite bishops ending after Rxg4 Bxg4 Kxg4 ? >> >> >> >> Christophe > > > >Oops... Sorry. > >OK, I've got it now. It's opposite colored bishops BEFORE the above capture >sequence. > >I did not get it at first because Tiger does not consider opposite bishop >endings as drawish when there are other pieces on the board (like rooks). > >Looks like I really should have a second look at this rule... :) > > > > Christophe with rooks on the board there are better chances for a win for the stronger side but I believe that the chances for a draw are still better than the chances for a draw in case that there are no opposite bishops. Note that even with only bishops on the board it is not always a draw and I won my last game in the israeli league thanks for the fact that I did not accept a draw offer when the material was equal Here is the relevant position [D]6k1/6pp/p1b5/5p2/5P2/3p2P1/PP5P/4B1K1 w - - 0 31 the last move of my opponent was Bb5-c6 and he offered me a draw I said no after some minutes of thinking because I found chances for a win and the game continued Kf2 Kf7 Ke3 Be4 Kd4 and only at this point my opponent understood that he has some trouble and started to think more than few seconds for a move. He wasted most of his half hour only to play Ke6 and later could not find the best moves and lost the game. Uri
This page took 0.01 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.