top of page

Inanis-1.1.1 released

Strength of about 2800 Elo. A growing chess engine, author Mr. Pawel Osikowski.

Inanis is a free and open source UCI chess engine written in Rust. Licensed under GPL 3. It is the successor of Proxima b, Proxima b 2.0 and Cosette.

Here are a few words from the author about the Inanis chess engine:


The project is written after hours, with the goal to reach a strength of 3000 Elo.

Perfect as a sparring partner for other chess engines, since it was heavily tested using very fast games. Supports Syzygy tablebases, MultiPV, pondering and multithreading.

Inanis 1.1.1 changelog:

Added support for FEN property in PGN parser and "tunerset" command

  • Replaced crossbeam package with native scoped threads

  • Fixed invalid handling of "isready" UCI command during a search

  • Fixed engine crash when trying to search invalid position

  • Fixed incorrect version of toolchain used in GitHub Actions


Inanis is a superbly documented chess engine; details posted on this page and this page.

I am sure that soon Inanis will reach a strength of 3000 Elo and I hope that Mr. Pawel Osikowski will continue the further development of this interesting chess engine.

I invite you to download Inanis.

Android – Compiled by Archimedes

Download ZIP • 4.01MB

Linux – Compiled by Pawel Osikowski

Download ZIP • 3.69MB

Mac Apple Silicon & Intel – Compiled by Darius

Download ZIP • 1.09MB

Windows – Compiled by Pawel Osikowski

Download ZIP • 2.33MB



Oh, another engine made by Poland (taking into account successors from other countries). And probably the only one actively developed?

Nov 12, 2022
Replying to

Yes, the author of this chess engine is from Poland.

If I remember correctly, another chess engine that is also actively developed by a Polish author is the Caissa engine:

bottom of page