Stockfish 8 is out!

This is the result of the effort of many people along many months: it has been a huge and hard effort and I would like to thank all the testers for their relentless patience, determination and creativity. I would like to thank all the people supporting us with CPU time (we don’t ask nor accept donations so if you want to support us then donating CPU time through fishtest is the way to go and we greatly appreciate that). I would like to thank Kiran Panditrao for the super fast binaries provided in record time and Daylen Yang for the amazingly fast update of the site: you guys are great!

Stockfish 8 is the same version that will go for the TCEC superfinal, it will be exactly the same, so what else should I say? Just fingers crossed for TCEC and have fun you all with this new Stockfish 8.

Differences between SF 7 and SF 8: 168 commits, 1683 additions, 1628 deletions

Download it here.

Stockfish 7 is out!

• This release is around 60 ELO stronger than Stockfish 6 in self play.
• SMP algorithm has been changed from YBW to Lazy SMP.
• Gary Linscott is now officially listed as a co-author.

Download it from https://stockfishchess.org/download/.

Stockfish 6 is now available!

This release adds support for Syzygy endgame tablebases, and is 50 ELO stronger than Stockfish 5 in self play.

We recommend that you download Syzygy bases via torrent from here: http://oics.olympuschess.com/tracker/index.php

Stockfish 6 binaries are available here: http://stockfishchess.org/download/

Stockfish 5 is now available!

This is the version that won TCEC Season 6 but without table-bases.

From SF DD released at end of November of last year a lot of work has been done:

44 files changed, 2272 insertions(+), 2764 deletions(-)

By many contributors both in patches:

• Arjun Temurnikar
• Chris Cain
• Daylen Yang
• Gary Linscott
• Henri Wiechers
• H. Felix Wittmann
• Jean-Francois Romang
• Jerry Donald
• Joerg Oster
• Jonathan Calovski
• Joona Kiiski
• Joseph Hellis
• Leonid Pechenik
• Lucas Braesch
• Marco Costalba
• Matt Sullivan
• Michel Van den Bergh
• mstembera
• Mysseno
• Pablo Vazquez
• Ralph Stoesser
• Reuven Peleg
• Richard Lloyd
• Ronald de Man
• Ron Britvich
• shane31
• Stefan Geschwentner
• Stephane Nicolet
• Thanar2
• Uri Blass

And in CPU time on fishtest.

A special thank goes to our webmaster Daylen Yang and to http://abrok.eu/stockfish/ from which we grab almost all the binaries, including the ones used for TCEC and for this release.

This is a new release of Stockfish after the last TCEC season. It is almost the same version that played the superfinal against Komodo.

DownloadBrowse the source code

For people compiling themselves, please verify signature is correct running ‘stockfish bench’ from a terminal window. At the end of the run, searched nodes shall be 8596156

Diffs from last version is: 32 files changed, 966 insertions(+), 1257 deletions(-)

So 291 lines of code less but should be quite stronger than version 4. For interested people here is the breakdown of lines count.

And here is the list of developers that contributed to this release:

• Chris Caino
• Eelco de Groot
• Gary Linscott
• Gregor Cramer
• Hongzhi Cheng
• Jean-Francois Romang
• Joona Kiiski
• Jörg Oster
• Kelly Wilson
• Kojirion
• Lucas Braesch
• Marco Costalba
• Matthew Sullivan
• Ralph Stößer
• Raminder Singh
• Reuven Peleg
• Uri Blass

A special thank to Daylen Yang, our precious webmaster and builder of the Mac binaries and to http://abrok.eu/stockfish/ from which I have, shameless, took the Windows binaries.

This release is dedicated to Don.