Triumviratus 8.1 20261102 - new version strong chess engine

-

Triumviratus is a strong, UCI-compliant chess engine written in C++. 
Author: Francesco (fraTorsello)   Rating Chess Engines Diary CEDR=3949

Triumviratus what's new?

Changes since the pre-release of 29 October

Search

  • Aspiration windows and optimism tuned (5 levers, SPSA run in the style of fishtest): +1.83 ± 2.78 Elo over
    15,006 games at 8+0.08.
  • Pruning of single moves tuned (22 levers: quiet and capture futility, move count, history pruning) and the history
    divisor per depth is now a parabola of our own instead of a 16-entry table: +1.71 ± 3.78 Elo over 7,734 games.
  • Correction weights rebalanced around a third pair of moves, our move six plies back with the opponent's last
    move, with the other correction weights scaled down so that the total correction keeps its size: +1.13 ± 2.67 Elo over
    16,586 games at 10+0.1.

Time management

  • The extra thinking time after a surprising move is now spent only when we are ahead on the clock, so that a side
    already short of time does not lose more of it (neutral in self-play, +0.94 ± 5.30 over 2,578 games at 25+0.25).

Speed

  • Fewer lookups of the sliding-piece attacks inside the network update (same search tree, same bench).

Other

  • Linux: engines started at the same time on one machine share one copy of the network (about 250 MB) instead of one
    copy each.
  • New search options, all off by default (razoring only in ALL nodes, a lower null-move threshold after null-move cuts
    among the siblings, a gradual return of the depth after a fail high at the root): they will be measured and tuned in
    the next runs.

Strength

  • Against the pre-release of 29 October: +8.99 ± 4.96 Elo over 4,522 games at 8+0.08, UHO openings (Xeon test
    machine, 1 thread each, no hyper-threading; +8.7 and +9.1 on the two sockets). Frozen PGO AVX-512 build of this
    source against the published universal executable of 29 October.

Thanks

  • Maurizio Platino (MortalSin), the project's main tester, who also shares the cost of training the networks.
  • A Tin Man and Bastiii, for their code contributions and reviews.
  • CCRL and the computer chess community.



Comments

Post a Comment

Popular posts from this blog

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

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

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

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