Bread Engine 1.4.0 - new version chess engine

 

Bread Engine is a chess engine written in c++. I started working on it in 2021, and only just finished. There is still a lot of room for improvement, but the engine is quite strong (for humans, at least). 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

Improved UCI commands, neural network is now always embedded in the executable. Bread engine is now a single executable, that you can download and run directly.

v.1.4.0:

Bread Engine 1.4.0 is around 64 elo stronger than version 1.3.0 in STC and around 44 elo stronger in LTC.

Additions/Improvements:

improved null move pruning condition

removed second search on root node

avoid pruning recaptures or promotions in quiescence search

prune late moves in quiescence search

improve history bonuses.

bug fixes:

fix the fifty move rule draw detection

avoid generating legal moves when there is a transposition table move

fix transposition evaluations in quiescence search

In addition, version 1.4.0 has many code refactors and cleanups compared to version 1.3.0.

STC: 10 + 0.1 s

Results of bread_engine_1.4.0 vs bread_engine_1.3.0 (10+0.1, 1t, MB, UHO_2024_8mvs_big_+115_+134.pgn):

Elo: 64.19 +/- 13.60, nElo: 84.91 +/- 17.58

LOS: 100.00 %, DrawRatio: 36.93 %, PairsRatio: 2.28

Games: 1500, Wins: 654, Losses: 380, Draws: 466, Points: 887.0 (59.13 %)

Ptnml(0-2): [33, 111, 277, 207, 122]

LTC: 40 + 0.4 s

Results of bread_engine_1.4.0 vs bread_engine_1.3.0 (40+0.4, 1t, MB, UHO_2024_8mvs_big_+115_+134.pgn):

Elo: 43.78 +/- 18.29, nElo: 60.20 +/- 24.87

LOS: 100.00 %, DrawRatio: 41.07 %, PairsRatio: 1.80

Games: 750, Wins: 308, Losses: 214, Draws: 228, Points: 422.0 (56.27 %)

Ptnml(0-2): [17, 62, 154, 94, 48]

Bread Engine 1.4.0 download