Radiance Engine

C++ chess engine

Search

• Negamax Framework
• Alpha-Beta Pruning
• Aspiration window
• Late move reduction
• Three-fold repetition
• Transposition tables

Evaluation

• Piece-square tables
• AlphaZero average piece values
• Endgame heuristics

Versions tournament

Rank	Name	Elo	+/-	Games	Score	Draw
1	radiance_3.3	370	19	2878	89.4%	5.6%
2	radiance_3.2	349	18	2881	88.2%	5.6%
3	radiance_3.1.1	242	15	2881	80.1%	6.3%
4	radiance_2.4	79	12	2882	61.2%	9.6%
5	radiance_3.0.1	71	12	2881	60.1%	7.7%
6	radiance_2.3	54	12	2880	57.8%	9.7%
7	radiance_2.2	-83	13	2880	38.2%	7.1%
8	radiance_2.1	-115	13	2882	34.1%	6.7%
9	radiance_2.0	-141	13	2884	30.8%	5.4%
10	radiance_1.5	-390	22	2884	9.6%	0.1%
11	radiance_1.4	-846	77	2887	0.8%	0.0%

Getting started

Compilation

export CXX=g++-12
export CC=gcc-12
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make
./radiance

UCI options

Name	Type	Default value	Valid values	Description
Hash	spin	256	[1, 131072]	Memory allocated to the transposition table (in MB).
Threads	spin	1	[1, 1]	Number of threads used to search.
Evaluation	combo	"PSQTuned"	["PSQTuned", "PSQ", "Shannon", "ShannonHeuristics"]	Type of evaluation function.
Search	combo	"abNegamax"	["abNegamax", "Minimax", "Random"]	Type of search function.

I'm radiant!