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.1.3.0:
Bread Engine 1.3.0 is around 58 elo stronger than version 1.2.0 in STC and around 45 elo stronger in LTC.
NNUE improvements:
Until now, Bread Engine had a neural network trained on lichess pgns featuring stockfish evaluations.
Bread Engine 1.3.0 has a new neural network, that was trained from scratch using games of self-play from version 1.2.0.
The new network has a slightly modified architecture, and a bug that produced integer overflows due to bad weight clipping has been fixed.
other improvements:
better transposition tables
code refactors
STC: 10 + 0.1 s
Results of bread_engine_1.3.0 vs bread_engine_1.2.0 (10+0.1, 1t, MB, UHO_2024_8mvs_big_+115_+134.pgn):
Elo: 57.97 +/- 13.68, nElo: 75.95 +/- 17.58
LOS: 100.00 %, DrawRatio: 39.47 %, PairsRatio: 2.09
Games: 1500, Wins: 692, Losses: 444, Draws: 364, Points: 874.0 (58.27 %)
Ptnml(0-2): [37, 110, 296, 182, 125]
LTC: 40 + 0.5 s
Results of bread_engine_1.3.0 vs bread_engine_1.2.0 (40+0.4, 1t, MB, UHO_2024_8mvs_big_+115_+134.pgn):
Elo: 45.19 +/- 19.21, nElo: 59.21 +/- 24.87
LOS: 100.00 %, DrawRatio: 39.73 %, PairsRatio: 1.72
Games: 750, Wins: 318, Losses: 221, Draws: 211, Points: 423.5 (56.47 %)
Ptnml(0-2): [20, 63, 149, 86, 57]
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