Author: Miguel A. Ballicora
Date: 21:33:56 02/17/02
Go up one level in this thread
On February 17, 2002 at 12:03:18, Uri Blass wrote: >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. This position looks pretty drawish. I think that Be4 is a waste of time. The right plan is to get the king to the center and be prepared to blockade a possible passed pawn (Q side) and defend the K side with the bishop. Regards, Miguel > >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 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.