Difficult endgame, but winning

bagaturchess / Bagatur

Java Chess Engine (UCI compatible)

http://bagaturchess.github.io/Bagatur/

Eclipse Public License 2.0

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Difficult endgame, but winning #14

Closed tissatussa closed 10 months ago

tissatussa commented 2 years ago

This position might be interesting for endgame testing : 8/7p/8/5n1K/4n1P1/k7/5P2/8 b - - 0 1 I checked the online TBs at https://syzygy-tables.info :

Nf6+ is draw

Black is able to win this endgame, but it's difficult (for a human). In the actual game Black played Nf6+ and made a draw.

meade88 commented 2 years ago

Hi,

I'd also include this endgame that came up recently in TCEC where Bagatur 2.2e was unfortunately not able to find the winning continuation against Vajolet. 8/5k2/4R3/5P1K/7P/5P2/8/6r1 b - - 0 96

Also I noticed a dramatic decrease of the NPS in those endgame positions for Bagatur in TCEC? Is that due to TBs?

bagaturchess commented 2 years ago

Hi All,

Thanks for these positions!

I will have a look as soon as possible.

Yes, TBs create dramatic decrease, sometimes even around 10 times, but I have never observed an issue with this during play (I mean ELO decrease).

Best regards, Krasimir

bagaturchess commented 10 months ago

Syzygy EGTBs are implemented and there is an UCI option to point to the files.