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Normal Topic R+BB vs R+B ? (Read 6693 times)
Smyslov_Fan
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Re: R+BB vs R+B ?
Reply #8 - 05/09/13 at 00:34:46
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Vass
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Re: R+BB vs R+B ?
Reply #7 - 05/07/13 at 12:06:44
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Girkassa wrote on 05/07/13 at 00:23:15:
... Even RBN-RB is generally a win, but that is a difficult one and will sometimes take more than 200 moves with perfect play.


Let's see what Lomonosov says about it:





Wink

Edit: The first case was with the same coloured bishops, while the second one - with different coloured bishops.
  
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Re: R+BB vs R+B ?
Reply #6 - 05/07/13 at 00:23:15
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You can add any pair of minor pieces to the RB-R endgame and get a general win if you don't count the 50-move rule. Even RBN-RB is generally a win, but that is a difficult one and will sometimes take more than 200 moves with perfect play.
  
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Re: R+BB vs R+B ?
Reply #5 - 05/06/13 at 20:22:23
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TalJechin wrote on 05/06/13 at 19:38:09:
Ah, nice! So, it's normally an easy win I presume (unless the weaker side can force an exchange of rooks or bishops) - that may explain why the books didn't mention it.


It's always useful to know more than the big books explain.  Wink
  
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Re: R+BB vs R+B ?
Reply #4 - 05/06/13 at 19:38:09
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Ah, nice! So, it's normally an easy win I presume (unless the weaker side can force an exchange of rooks or bishops) - that may explain why the books didn't mention it.
  
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Re: R+BB vs R+B ?
Reply #3 - 05/06/13 at 15:29:39
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Sad but true!  Roll Eyes
Anyway, as for this specific position:

* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
* * * * * * * *
*

FEN: 3r4/4b1k1/8/8/8/3B4/3B4/2R1K3 w - - 0 1

...look at what Lomonosov says!  Grin

  
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TalJechin
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Re: R+BB vs R+B ?
Reply #2 - 05/06/13 at 12:19:07
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Vass wrote on 05/06/13 at 08:05:50:
TalJechin wrote on 05/06/13 at 07:41:42:
Wondering about the verdict on the ending R+BB vs R+B, I would assume that the extra 2 bishops would increase winning chances compared to R+B vs R, but I don't see it mentioned in my few endgame books. Are there any 7 men tablebases available somewhere - or is that still some years away?

There are the so-called Lomonosov 7-men endgame tablebases available for those who bought the ChessOK Aquarium software. These are made in the famous Lomonosov Institute in Moscow.
I'm not a big fan of this Aquarium program, but it seems to me I have to buy it after all.  Embarrassed


But later you may need to pay for a subscription too: "Until December 31, 2013, the tablebases will be available online and for free to all owners of Aquarium"

Hopefully, the 7-men TBs will eventually end up on a server with free access...  Undecided
  
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Re: R+BB vs R+B ?
Reply #1 - 05/06/13 at 08:05:50
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TalJechin wrote on 05/06/13 at 07:41:42:
Wondering about the verdict on the ending R+BB vs R+B, I would assume that the extra 2 bishops would increase winning chances compared to R+B vs R, but I don't see it mentioned in my few endgame books. Are there any 7 men tablebases available somewhere - or is that still some years away?

There are the so-called Lomonosov 7-men endgame tablebases available for those who bought the ChessOK Aquarium software. These are made in the famous Lomonosov Institute in Moscow.
I'm not a big fan of this Aquarium program, but it seems to me I have to buy it after all.  Embarrassed
  
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TalJechin
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R+BB vs R+B ?
05/06/13 at 07:41:42
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Wondering about the verdict on the ending R+BB vs R+B, I would assume that the extra 2 bishops would increase winning chances compared to R+B vs R, but I don't see it mentioned in my few endgame books. Are there any 7 men tablebases available somewhere - or is that still some years away?
  
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