The RNN/RB endgame

Endgame analysis using tablebases, EGTB generation, exchange, sharing, discussions, etc..
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Arpad Rusz
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The RNN/RB endgame

Post by Arpad Rusz »

Does anybody knows what is the general outcome of this endgame?
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YashaK
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Re: The RNN/RB endgame

Post by YashaK »

Arpad Rusz wrote:Does anybody knows what is the general outcome of this endgame?
According to our with Marc Bourzutschky results both krnnkrb and krnnkrn are a common win
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Arpad Rusz
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Post by Arpad Rusz »

Thanks for your answer!
I am a study composer and these are maybe sad news for one of my new studies: there are some RNN/RB positions which must to be only draws...Like the following positions with white to move:

8/2N2k1K/6N1/5rb1/8/8/8/1R6
8/2N2k1K/6N1/5rb1/8/8/8/1R6

1R5K/3k4/6N1/1N4r1/8/8/3b4/8
1R5K/3k4/6N1/1N4r1/8/8/3b4/8

But I am happy that somebody is working on 7-men tablebases. When will be the new tablebases publicly available? Or maybe 7-men bitbases which are much smaller in size?
Last edited by Arpad Rusz on Thu Feb 14, 2008 9:47 pm, edited 2 times in total.
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mbourzut
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Post by mbourzut »

Arpad,

the first position is a win for white, with mate or capture in at most 88 moves after 1.Rd1.

the second position is a draw.

Regards,
Marc
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Arpad Rusz
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Post by Arpad Rusz »

Many thanks for your answer! So the my study is cooked, as I suspected. Somehow I have to find a version which avoids those tricky RNN_RB endgames...
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