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Revolution 5.90 140626 - UCI chess engine (based on Stockfish)

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Revolution - Revolution is a free, open-source UCI chess engine derived from Stockfish. Jorge Ruiz Centelles, with credit to ChatGPT, modifies and extends the code to explore new concepts. The engine implements cutting-edge search algorithms combined with neural network evaluation. Derived from fundamental chess programming principles, Revolution analyzes positions through parallelized alpha-beta search enhanced with null-move pruning and late move reductions.

As a UCI-compliant engine, Revolution operates through standard chess interfaces without an integrated graphical interface. Users must employ compatible chess GUIs (Arena, Scid vs PC, etc.) for board visualization and move input. Consult your GUI documentation for implementation details.

Rating Chess Engines Diary CEDR=3744

What changed in Revolution 5.990-140626 

Code: Select all
* Release identity updated to `Revolution-5.90-140626`.
* Active NNUE remains `nn-71d6d32cb962.nnue`.
* Strict single-net status preserved.
* `EvalFileSmall`, `NetworkSmall`, `nn-83a0d6daf7e5.nnue`, MCTS and MonteCarlo surfaces remain absent.
* Book, Experience, Zobrist and Syzygy behaviour preserved.
Stockfish-dev topology covered in this update includes the June 6–10 block:
Code: Select all

* modern attacks topology imported and adapted;
* search formula simplifications;
* TT underflow guard work;
* consistent integer aliases/types;
* RelaxedAtomic / wasm-related topology where applicable;
* `previousPV` / MultiPV mate-PV correction;
* NNUE active bridge work;
* HalfKA / Threats accumulator merge;
* `Position::do_move` reorder;
* `materialKey` correction;
* stop-search condition when no better move is possible;
* FEN pawn-rank validation

Revolution 4.90 210226 vs other engines:

Raid 6.013/26+026 games
Hlamnick 20022612.5/26-126 games
Artemis 27TR PrO12.5/26-126 games
Stockfish 18 JA11/22+022 games
DON dev-2026022210.5/20+120 games
Leptir Testpilot10.5/20+120 games
DarkSeid 10.3 SE9.5/18+118 games
SF-PRO2 29.01.20269.5/18+118 games
Stockfish dev-202602189/18+018 games
ShashChess 409/18+018 games
Brainlearn 318.5/18-118 games
StockfishMZ 1212258.5/18-118 games
CorChess 202602128.5/18-118 games
Kookaburra 3.117/14+014 games
Halogen 16.0.07/10+410 games
SF-POLY 1602264.5/8+18 games
HypnoS EN 2.04.5/8+18 games
JigSaw 8.04/8+08 games
Stockfish 184/8+08 games
DarkSeid 10.2 SE4/8+08 games
Sky Mini MPV3.5/8-18 games

Revolution 5.90-140626 - download 

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