Bread Engine 3.1.0 - new version chess engine

 

A new version of the chess engine has just been released – Bread Engine 2.1.1. Previous versions didn't break into the CEDR Top 64 chess engines and were ranked among amateurs. We'll see how this engine fares; the first tests will be held soon.

Bread Engine is a chess engine written in c++. It uses NNUE (efficiently updatable neural network) to evaluate positions, as well as minimax search. Bread engine does not have a GUI built in, however it supports the uci protocol, you can therefore run it on any chess GUI.

Author: Nonlinear2

What's new and key changes in the new version of the Bread Engine 3.1.0?

This is a smaller Bread release, with bug fixes, multithreading support and some search improvements. You can find the progression tests results in the table below:

Short time control (8 + 0.08 s)	+55 Elo
Long time control (40 + 0.4 s)	+62 Elo

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What's new:

Multithreading

• added lazy SMP:

Thread odds 2 vs 1 (8 + 0.08 s)	+86 Elo
Thread odds 2 vs 1 (40 + 0.4 s)	+68 Elo

Main search:

• rfp corrplexity adjustments (~3 elo)
• small probcut (~6 elo)
• ttPv reductions (~6 elo)
• re-search depth adjustments (~2 elo)
• non-pawn correction history (~6 elo)
• minor piece correction history (~6 elo)
• major piece correction history (~2 elo)

NNUE:

• new training data and training schedule (~40 elo)

Simplifications / Bug fixes:

• fixed occasional blunders

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Progression tests results

LTC: 40 + 0.4 s

Elo   | 62.04 +- 3.56 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=128MB
Games | N: 10000 W: 2429 L: 662 D: 6909
Penta | [17, 392, 2661, 1667, 263]
https://nonlinear.eu.pythonanywhere.com/test/1212/

STC: 8 + 0.08 s

Elo   | 54.96 +- 4.15 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=32MB
Games | N: 10014 W: 2791 L: 1220 D: 6003
Penta | [61, 698, 2202, 1701, 345]
https://nonlinear.eu.pythonanywhere.com/test/1211/

Bread Engine 3.0.0 vs other chess engines:

Alexander 8.1	8/22	-6	22 games
PZChessBot 6.0 JA	8/20	-4	20 games
Pawnocchio 1.9.2	7/20	-6	20 games
Tarnished 5.0	6.5/20	-7	20 games
Caissa 1.24 JA	5/20	-10	20 games
Quanticade 3.0	4/20	-12	20 games
Clover 9.1 JA	3.5/20	-13	20 games
Halogen 16.4.0	2.5/18	-13	18 games
Viridithas 19.0.1	3.5/16	-9	16 games
Jackal 2.0.0	8.5/14	+3	14 games
Tcheran 11.0	3.5/10	-3	10 games
RubiChess 20260308	3.5/10	-3	10 games
Motor 0.9.0	2.5/10	-5	10 games
Horsie 1.1.0 JA	2/10	-6	10 games
Alexandria 9.0.0 JA	1/10	-8	10 games
Catalyst 1.0	7/8	+6	8 games
Integral 7.0.0 JA	1.5/8	-5	8 games
Leaf dev-5382 JA	4/6	+2	6 games
Raphael 3.2.0	3/6	+0	6 games
Dragon 3.3	2.5/6	-1	6 games
Petrel 3.4 JA	3.5/4	+3	4 games

Bread Engine 3.1.0 download