Hypersion 3.0 - new version chess engine

-

Hypersion a free, open-source UCI chess engine.
Hypersion uses an NNUE network for evaluation (Stockfish 18 SFNNv10 architecture: HalfKAv2_hm features + FullThreats, big network 1024-d FT, small network 128-d FT) on top of an alpha-beta search with PVS, transposition table, aspiration windows, late-move reductions, singular extensions, ProbCut, futility/razoring/SEE pruning, and lazy-SMP infrastructure (single-threaded by default — multi-thread is currently unstable).
Author: RenCopp

Hypersion 3.0 what's new?

Patch notes (binaries updated 2026-05-11, second round)

Four additional commits land on top of the original v3.0:

  • Endgame mate-conversion fix (eb35855) — user-reported lichess
    game H05vgtVr where the engine drew K+R vs K by 50-move rule. In
    clearlyWinningEndgame positions (≤10 pieces and ≥rook material
    lead) the strength-limit caps now lift entirely so the engine can
    actually find a 16-ply mating plan. Validated: 245/252 = 97%
    conversion     across 21 cells (7 UCI_Elo levels × 3 movetimes).

  • Real UCI_AnalyseMode pruning relaxation (26fa62d) — when GUI
    sets UCI_AnalyseMode=true, the search now disables NMP, skips
    LMP/futility/SEE-margin pruning, and halves LMR aggression for
    thoroughness. Tactical-suite uplift at standard analysis conditions:

    SuiteBeforeAfterDelta
    WAC93.9%96.5%+2.6%
    mate-in-394.5%97.5%+3.0%
    mate-in-585.4%88.9%+3.5%
    mate-in-865.0%66.0%+1.0%

    Default play (UCI_AnalyseMode=false) is bit-for-bit unchanged —
    bench 13 @ Threads=1 produces exactly 1,107,765 nodes on both
    old and new binary.

  • NNUE EvalUseSmallOnly experiment (635e2ce) — tombstoned at
    -47 ELO; infra retained for future re-experimentation.

  • A4/A6 LTC SPSA retry (d192f25) — tombstoned at 0.0 ± 53 ELO;
    the 8 search/TM tunables are at a local optimum at all TCs.

Downloads

Pick the build that matches your CPU:

  • Hypersion-x86-64-avx2.exe — broadly compatible (Intel Haswell+ / AMD Zen+)
  • Hypersion-x86-64-bmi2.exe — uses PEXT for sliders (Intel Ice Lake+ / AMD Zen 3+)
  • Hypersion-x86-64-avxvnni.exe — uses 256-bit VNNI for NNUE inference (Alder Lake+ / Zen 4+), +29.6 ± 35.6 ELO over avx2 in this codebase

Three NNUE network files are required at the same directory as the
binary: nn-c288c895ea92.nnue (big), nn-37f18f62d772.nnue (small),
Perfect2023.bin (opening book). They're listed in the repo root.
The convenience .zip bundles include everything pre-packaged.

Status

Hypersion has reached a strong local optimum on its current SF18 NNUE
network. The most realistic remaining ELO ceiling is an NNUE
retrain (architecture + training data both available; project
author lacks GPU resources). Active development resumes when a
contributor steps up — open an issue if interested.



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