Author: martin fierz
Date: 13:45:45 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 then again, maybe you should not :-) opposite colored bishops with queens give great winning chances if you can attack the other king. with rooks on, things are very unclear too - i think you have the rule right. martin
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