The long-awaited ninth version of one of the most powerful chess engines just had a premiere. Koivisto is a free open source engine.
January 15, 20202. Here's what Koivisto Chess Engine Developers wrote:
Today, we are excited to announce the release of Koivisto 9. After a six-month break, we are back and eager to continue development. The majority of the strength increase since Koivisto 8 comes from improvements in training data, but we also made some small search adjustments.
ELO | 89.70 +- 3.53 (95%) CONF | 8.0+0.08s Threads=1 Hash=8MB GAMES | N: 20000 W: 7876 L: 2824 D: 9300
We had the pleasure of working with Jay (author of Berserk) which resulted in both of our engines merging and sharing a neural network training framework as well as training data. This collaboration led to a significant increase in strength:
ELO | 19.41 +- 6.65 (95%) SPRT | 40.0+0.40s Threads=1 Hash=64MB LLR | 2.95 (-2.94, 2.94) [0.00, 2.50] GAMES | N: 5072 W: 1369 L: 1086 D: 2617 ELO | 20.02 +- 6.80 (95%) SPRT | 8.0+0.08s Threads=1 Hash=8MB LLR | 2.96 (-2.94, 2.94) [0.00, 2.50] GAMES | N: 4968 W: 1373 L: 1087 D: 2508
The addition of more training data also contributed to nice gains:
ELO | 29.79 +- 2.91 (95%) CONF | 8.0+0.08s Threads=1 Hash=8MB GAMES | N: 16848 W: 3334 L: 1893 D: 11621
Although we don't have regression tests to show for the search improvements and speed-ups, they are where the rest of the gains come from. Attached you can find executables for AVX2 and SSE systems. Executables for PEXT and/or AVX512 systems are available via Ipman. With love and appreciation, Finny and Kimmy.
I am very happy to see the cooperation of Koivisto Creators together with Jay Honnold Creator of Berserk. Koivisto and Berserk are some of the most powerful open source chess engines on planet earth!
I'm very curious to see how the latest Koivisto will do in MCERL; results coming in the next few days :)
Download Koivisto 9.0
As of the publication date of this post, you can download the Koivisto 9.0 chess engine in x64 versions for Linux and Windows from the project's website.
Feel free to directly download Koivisto 9.0 from here:
Android – Compiled by Archimedes
Linux arm64 & x64 – Compiled by Darius
Mac Apple Silicon & Intel – Compiled by Darius
Windows x86_64 – Compiled by Darius
For your convenience in the Files area you will find all chess engines for download, which I post in the News section.