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H Treer vs Hans Fahrni
corr (1927), ?
Zukertort Opening: Queen's Gambit Invitation (A04)  ·  1-0


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Kibitzer's Corner
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  GrahamClayton: Amazing position after 66.♘xd7+:

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N+B+B v R is a rare endgame.

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  kevin86: It looks like B+B+N vs Rook can win,while N+N+B vs R is hopelessly drawn-any opinions?
May-14-11  kellmano: Presumably in N+N+B v R it is probably very difficult to avoid the B being exchanged for the R. PErhaps not impossible though.
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  FSR: <kevin86: It looks like B+B+N vs Rook can win,while N+N+B vs R is hopelessly drawn-any opinions?>

Essentially that is correct. Staunton recognized in <The Chess-Player's Handbook (1847)> that BNN v. R is drawn, while BBN v. R is a win for the pieces. (Curiously, Fine in <Basic Chess Endings>, almost a century later, got it wrong - claiming that both endings are drawn - as did Benko in the revised algebraic addition!) Computers confirmed both assessments about 150 years later - prior to the revised, and erroneous, <BCE>. My only quibble with your statement is that I wouldn't say that BNN v. R is <hopelessly> drawn - but it is drawn. Karpov vs Kasparov, 1991

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  FSR: <kellmano: Presumably in N+N+B v R it is probably very difficult to avoid the B being exchanged for the R. PErhaps not impossible though.>

I agree on both scores. If you examine Karpov vs Kasparov, 1991, you'll see that the defensive technique involves keeping the rook far away from the pieces, checking, pinning, and harassing the bishop whenever possible.

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  kevin86: There are,of course,two other possibilities:Three knights look like an elementary draw,while three bishops is probably too bizarre to even think about.
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  louispaulsen88888888: B+B+N vs. R is generally won, but if the bishops are on the same color, the general result is a draw!
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  louispaulsen88888888: The revised BCE by Benko is quite disappointing. Many of Fine's errors could have been noticed and corrected simply by using a computer to check the analysis.
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  perfidious: There was a fellow, name of John Speights, from North Carolina, who corrected a great many of Fine's errors and submitted them to Larry Evans' column for publication back in the 1970s.
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