Author: Christophe Theron
Date: 13:48:10 02/12/01
Go up one level in this thread
On February 12, 2001 at 02:09:28, Uri Blass wrote:
>On February 11, 2001 at 22:13:00, Robert Hyatt wrote:
>
>>On February 11, 2001 at 18:23:01, Uri Blass wrote:
>>
>>>On February 11, 2001 at 18:10:33, Robert Hyatt wrote:
>>>
>>>>On February 11, 2001 at 12:24:21, Vincent Lejeune wrote:
>>>>
>>>>>in this position :
>>>>>
>>>>>[d]k7/p7/1p6/3p4/3K1B2/r7/8/4R3 w - - 0 1
>>>>>
>>>>>Gambit Tiger 1.0 gives +2.14 for white , I think it's a big overevaluation for
>>>>>white !
>>>>>
>>>>>
>>>>
>>>>
>>>>It's a common enough error. In reality if anybody wins, black wins. White
>>>>has no winning chances at all.
>>>
>>>
>>>I disagree.
>>>
>>>In a game between humans white has chances because he has chances to capture all
>>>the black pawns and win the KRB vs KR endgame.
>>>
>>>In a game between computers white has also chances if the defender does not use
>>>the KRB vs KR tablebases.
>>>
>>>It is a draw but I prefer white because white captures one pawn and is not going
>>>to lose with Rook and bishop against Rook and 2 pawns beacause the pawns are at
>>>a7 and b6 and the king is in the middle of the board so it is easy for white to
>>>prevent the pawns to get forward.
>>>
>>>Black practically may lose by the following steps:
>>>1)losing the pawns
>>>2)not finding the right moves in KR vs KRB endgame.
>>>
>>>Uri
>>
>>
>>Black can also drop dead and his flag will fall. :)
>>
>>Otherwise I can't imagine black losing this. Drawing KRB vs KR is _not_
>>a difficult task.
>
>Here is a position that white lost in a comp-comp game when both sides di not
>use tablebases.
>
>[D]7R/8/8/2k5/6Kp/8/7r/5n2 w - - 0 1
>
>White(Gandalf4.32f played Rxh4 but it did not help it to save the game against
>Fritz6)
>
>The game was at tournament time control and it proves that you have practical
>chances even in KRN vs KR if your opponent has not the right knowledge.
>
>KRN vs KR is usually a draw between humans but I know that humans often win KRB
>vs KR endgames.
>One of the examples that I remember is from one of the olympiads more than 10
>years ago when IM ilan manor won a game for Israel in KRB vs KR position.
>
>The opponent was not a weak player otherwise IM manor could beat him more easily
>without KRB vs KR position.
>
>If you know how to play KR vs KRB then a draw is not a difficult task in most of
>the cases but a lot of humans do not know how to play it.
>
>Uri
And I remember that Chess Tiger (was it version 11.2?) has won a KRB vs KR
endgame against Zugzwang in Paderborn 2 or 3 years ago.
The programs were not using tablebases, and as far as I remember Zugzwang was
using a bunch of processors. But it lost.
Christophe
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