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The RNN/RB endgame
Posted: Thu Jul 05, 2007 8:32 am
by Arpad Rusz
Does anybody knows what is the general outcome of this endgame?
Re: The RNN/RB endgame
Posted: Sat Jul 07, 2007 2:54 am
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
Posted: Sat Jul 07, 2007 9:15 am
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
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?
Posted: Sat Jul 28, 2007 5:43 pm
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
Posted: Sun Jul 29, 2007 1:51 pm
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...