Author: Robert Hyatt
Date: 14:34:24 02/12/01
Go up one level in this thread
On February 12, 2001 at 03:39:05, Sune Larsson 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. > > For humans it's a tricky ending. I've seen several players, rated above ELO > 2400, lose this KR vs KRB. And that under serious tournament conditions. > Guess you have to know it thoroughly. I, for sure, don't. > > Sune By the same token, I have seen GM players unable to win KQ vs KR, yet it is actually not hard at all once you know the ending. Had a player (USCF master yet) explain it on rec.games.chess.computer a couple of years ago and I had no problem following his 'plans'. But for a computer to enter a KRPPP vs KRB and think the rook and bishop is going to win is not a good idea. Crafty occasionally draws such endings too easily as it will trade a piece for the opponent's last pawn knowing that it then can't lose, period. It wins many such positions, but it might have been an easier win keeping the piece.
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