Rudim 3.0.5 - new version chess engine

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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 3.0.5 what's new?

Network: v4-gen2

Features

Fixes

  • none

Maintenance

Statistics

Node Count Reduction (Same-Depth Comparison):

PositionDepthv3.0.4 (Previous)v3.0.5 (Current)Reduction
Starting13922.0k1066.4k0.86x
Advanced163754.3k23154.3k0.16x
Kiwi Pete12920.1k1357.2k0.68x
Endgame17777.5k5994.3k0.13x

Tournament vs v3.0.4 @ 8+0.1 - for just this release, ran 2 smaller tournaments

x64 (AVX2 v3.0.5 vs 3.0.4)

Score of Rudim-3.0.5 vs Rudim-3.0.4: 366 - 191 - 443 [0.588]
...      Rudim-3.0.5 playing White: 197 - 92 - 211  [0.605] 500
...      Rudim-3.0.5 playing Black: 169 - 99 - 232  [0.570] 500
...      White vs Black: 296 - 261 - 443  [0.517] 1000
Elo difference: 61.4 +/- 16.1, LOS: 100.0 %, DrawRatio: 44.3 %
SPRT: llr 0 (0.0%), lbound -inf, ubound inf
1000 of 1000 games finished.

arm64 (NEON)

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Results of Rudim 3.0.5 vs Rudim 3.0.4 (8+0.1, NULL, 64MB, 8moves_v3.pgn):
Elo: 33.11 +/- 14.34, nElo: 50.05 +/- 21.53
LOS: 100.00 %, DrawRatio: 40.00 %, PairsRatio: 1.70
Games: 1000, Wins: 287, Losses: 192, Draws: 521, Points: 547.5 (54.75 %)
Ptnml(0-2): [17, 94, 200, 155, 34], WL/DD Ratio: 0.47
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