Rudim 3.0.3 - 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 3.0.3 what's new?

Features

• v3-gen3 network (9e00896)
• setoption hash (4149e88)
• accumulator on history stack (ef51772)
• fused accumulator updates (e2bd520)

Fixes

• quiescence check handling (8bd1324)
• state corruption on search cancellation (6206079)
• reset search heuristics before search (092a6e0)

Maintenance

• reduce movelist size (ab1e3e5)
• transposition table dead code cleanup (8ee0c3b)
• bump actions/checkout from 6.0.2 to 6.0.3 (854161a)

Statistics

Node Count Reduction (Same-Depth Comparison):

Position	Depth	v3.0.2 (Previous)	v3.0.3 (Current)	Reduction
Starting	13	1332.9k	1320.5k	1.01x
Advanced	16	14172.0k	2329.0k	6.09x
Kiwi Pete	12	1417.9k	914.9k	1.55x
Endgame	17	1012.5k	864.5k	1.17x

Tournament vs v3.0.2

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Results of Current Rudim vs Stable Rudim (8+0.1, NULL, 64MB - NULL, 8moves_v3.pgn):
Elo: 86.15 +/- 15.07, nElo: 128.32 +/- 21.53
LOS: 100.00 %, DrawRatio: 34.20 %, PairsRatio: 3.77
Games: 1000, Wins: 374, Losses: 131, Draws: 495, Points: 621.5 (62.15 %)
Ptnml(0-2): [11, 58, 171, 197, 63], WL/DD Ratio: 0.42
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Rudim 3.0.3 download