Clockwork dev-20260806 - new version chess engine

-

Clockwork - UCI chess Engine
Author: The Clockwork team  Rating Chess Engines Diary CEDR=3447

This is the latest version of the Clockwork engine. It is currently competing in the qualifying rounds of the TOP-64 Chess Engine League, where it scored 5.5/11 in the February 2026 edition. Although subsequent versions are getting stronger, the next edition in March 2026 is expected to be more successful.

Clockwork dev-20260806 what's new?

Introduce TB support (#422)
Implemented syzygy tablebase support via Pyrrhic.

Implementation is essentially ported (as with #418) from stormphrax, complete with correct multipv handling and handling for repetition edge cases.

Bitboard attacks with sliders based on jw's implementation in [akimbo](https://github.com/jw1912/akimbo) are also included. This will need to be adressed to reclaim some speed.
The need of inclusion of pyrrhic wholly in the vendor folder (rather than a lazy download when building) is due to the problem with importing the bb attacks headers (which we purposefully left in the main repository, so that we might use them in eval in the future).

Also identified a TODO in uci.cpp, as SyzygyPath currently does not accept values with spaces

Passed STC with 6-Man:
```
Test  | tb
Elo   | 16.62 +- 5.82 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.97 (-2.94, 2.94) [0.00, 3.00]
Games | N: 4226 W: 1217 L: 1015 D: 1994
Penta | [32, 404, 1063, 558, 56]
```
https://ob.cwchess.org/test/1551/

Passed LTC with 6-Man:
```
Test  | tb
Elo   | 18.18 +- 5.70 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 2.96 (-2.94, 2.94) [0.00, 3.00]
Games | N: 3366 W: 896 L: 720 D: 1750
Penta | [12, 263, 961, 431, 16]

Bench: 13841007


Clockwork dev-20260806 download

To deliver high-precision engine comparisons, my hardware runs 24/7. This project relies on the support of the chess community to stay sustainable. If you appreciate the "under the hood" work I do here, a small PayPal donation goes a long way in keeping the servers humming and the data flowing.

Comments

Post a Comment

Popular posts from this blog

Reckless 0.9.0 - new version super strong chess engine

-
Image
  Reckless , a Rust-based UCI chess engine. Author: Arseniy Surkov    Rating Chess Engines Diary CEDR=3743 Reckless is the new star among chess engines. On the new Chess Engines Diary CEDR ranking list, Reckless is ranked 2th with a rating of 3743 . Testing of the new engine version is coming soon. Reckless 0.9.0 what's new? Reckless 0.9.0 is ready! You can download pre-built binaries for Windows, Linux, and macOS from the GitHub Releases page. Thanks to everyone who contributed through code, testing, hardware support, or any other effort. This release came together because of your help. Update highlights NNUE The neuron network has been updated to a modern threat-based architecture. It models the interactions between pieces, where one piece attacks or defends another, and extends the existing king-bucketed piece-square-based inputs with additional features. Multithreading and NUMA support NUMA (Non-Uniform Memory Access) support has been added to Reckless. Work...
Read more

Reckless 0.10.0 - new version super strong chess engine

-
Image
  Reckless , a Rust-based UCI chess engine. Author: Arseniy Surkov    Rating Chess Engines Diary CEDR=3743 Reckless is the new star among chess engines. On the new Chess Engines Diary CEDR ranking list, Reckless is ranked 2th with a rating of 3743 . Testing of the new engine version is coming soon. Reckless 0.9.0 what's new? Reckless 0.9.0 is ready! You can download pre-built binaries for Windows, Linux, and macOS from the GitHub Releases page. Thanks to everyone who contributed through code, testing, hardware support, or any other effort. This release came together because of your help. Update highlights NNUE The neuron network has been updated to a modern threat-based architecture. It models the interactions between pieces, where one piece attacks or defends another, and extends the existing king-bucketed piece-square-based inputs with additional features. Multithreading and NUMA support NUMA (Non-Uniform Memory Access) support has been added to Reckless. Work...
Read more

Torch-4 UCI v 1.01 - new version chess engine

-
Image
Torch-4 UCI v 1.01 what's new? Bugfix regarding relative node.exe and engine path. If torch.exe previously did not work in some GUIs, it now should. Download the source code as a zip file, extract it and use either torch.exe or torch.bat as the engine. github:https://github.com/Felixk45/Torch-4-UCI-chess-engine/releases Torch-4 UCI v 1.01 download from page
Read more

We already have the new Fritz 20 program - what does it look like and how does it work?

-
Image
The purchase process for the download version on the ChessBase website took only 5 minutes. Downloading the files from the cloud was even quicker. The installation itself, which involved five large files, took maybe 7 minutes, including restarting the system and entering the serial number I received upon purchase. The start image for Fritz 20 has a strange mosaic of colors; perhaps I'll get used to it. As you can see in the second screenshot, the program interface hasn't changed much; only the icons are different (we've been using Fritz 17 until now). It looks nice, but it's no major revolution. The next two screenshots show engine management and the installation of the UCI chess engine (here, Cataphract 1.1). As you can see, there are no changes. Screenshot no. 5 shows the analysis of some position by Fritz 20 engines. The changes are minimal - it is still very legible. Finally, on screen 6 we have the engine tournament table generated by Fritz 20 . I think it is sti...
Read more