Rudim 3.0.1 - new version chess engine

 

Rudim - UCI-compliant chess engine written in Rust

Author: Vishnu Bhagyanath

Previous version: Rudim 2.1.3 participated in the qualifying rounds for the CEDR Chess Engine League, which features 64 of the best engines. The engine did not advance, but earned a spot guaranteeing entry into the qualifying rounds for the 6/2026 edition.

Rudim 3.0.1 what's new?

Features

• increase NNUE HL size to 64 (1f73cc6)
• cumulative datagen (cd80338)

Fixes

• fetch submodules during publish (cc18b8e)
• fix search traversal tests (6dc1336)

Maintenance

• remove old code (convert, pst) (f2bfb5d, 661829f)
• refactor training code (d2e8892)
• datagen implementation fixes (e39b13b)
• docs: README, agent instructions (d263b4e, 560c0f8, c59854c, ad246ff, 94f0327, 1f1e739, 46d4a09)

Statistics

Node Count Reduction (Same-Depth Comparison):

Position	Depth	v3.0.0 (Previous)	v3.0.1 (Current)	Reduction
Starting	13	791.6k	997.5k	0.79x
Advanced	16	6431.7k	2798.5k	2.30x
Kiwi Pete	12	1067.9k	1294.7k	0.82x
Endgame	17	3121.6k	1437.3k	2.17x

Tournament vs v3.0.0

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Results of Rudim 3.0.1 vs Rudim 3.0.0 (8+0.1, NULL, NULL, 8moves_v3.pgn):
Elo: 121.46 +/- 18.03, nElo: 157.38 +/- 21.53
LOS: 100.00 %, DrawRatio: 31.20 %, PairsRatio: 4.64
Games: 1000, Wins: 509, Losses: 173, Draws: 318, Points: 668.0 (66.80 %)
Ptnml(0-2): [15, 46, 156, 154, 129], WL/DD Ratio: 1.64
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Rudim 3.0.1 download