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- - By notyetagm (**) Date 2011-01-02 05:53
Can someone please summarize the performance of the Rybka Cluster on this fiendishly difficult data set?

Thanks
Parent - - By George Tsavdaris (****) Date 2011-01-07 21:26
9/10
Just amazing!!
Rybka now started to solve fortress positions also, not because it understands them, but because it applies the method of proof by contradiction. It finds other moves are more crap than the solution(a fortress solution will have a high score of -6.0 for example, but it will not get worse, while the other moves that will not lead to fortress will initially have a much smaller score e.g -3.0 but Rybka cluster searches so deep that it will eventually see that they lose, so it would choose the move that leads to fortress), so it will play the solution move!
Parent - - By Uri Blass (*****) Date 2011-01-08 01:32 Edited 2011-01-08 01:38
I think that you simply did not give the cluster the right fortress to let it fail
2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - 0 1
Petrosian vs. Hazai 

avoid Nxb6 that leads to an easy draw

White need to play to win the pawn a5
I am not sure if it wins the game(did not do enough analysis to know) but it certainly better than allowing a simple fortress.
Parent - - By Jonas (****) Date 2011-01-10 04:04
dont need a fortress:

3k4/2pq3p/1p5R/p3P3/P6P/2PN4/1PN3K1/8 w - - 0 1


bm Nd4 white wins
Parent - - By George Tsavdaris (****) Date 2011-01-10 12:19
It's a fortress for the Queen.
Parent - - By Jonas (****) Date 2011-01-10 14:50
Parent - By Uly (Gold) Date 2011-01-10 17:27
Get out of here!
Up Topic Rybka Support & Discussion / Rybka Discussion / 10 beautiful testpositions! Rybka-Cluster challenge....
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