Hi, I am a UCI chess engine. I'm the second chess engine my author has written, thus the really unimaginative name, following the first program chess. You can find my lichess profile. Challenge me to a game if you fancy.
Normally a UCI chess engines requires a GUI. Arena and Banksia are tested with chess-2, but all UCI compatible UIs should work.
You can also run the engine in the console, issuing UCI commands.
On a linux/unix compatible system with the GNU C compiler and GNU make the engine should build without any tweaks required:
% cd chess-2
% make
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I./src main.c -o main.o
make[1]: Entering directory '/home/phaul/chess-2/src'
flex -o uci.yy.c uci.fl
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src uci.yy.c -o uci.yy.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src attacks.c -o attacks.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src board.c -o board.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src evaluate.c -o evaluate.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src killer.c -o killer.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src move.c -o move.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src moveexec.c -o moveexec.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src movegen.c -o movegen.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src movelist.c -o movelist.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src pawns.c -o pawns.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src perft.c -o perft.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src pv.c -o pv.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src search.c -o search.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src see.c -o see.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src uci.c -o uci.o
cc -c -Wall -Werror -pedantic -O2 -g -DNDEBUG -I/src zobrist.c -o zobrist.o
make[1]: Leaving directory '/home/phaul/chess-2/src'
cc -Wall -Werror -pedantic -O2 -g -DNDEBUG -I./src -o chess2 main.o src/*.o
To build the CI tests install the cmocka testing framework.
% cd chess-2/test
% make
make[1]: Entering directory '/home/phaul/chess-2/src'
make[1]: Nothing to be done for 'build'.
make[1]: Leaving directory '/home/phaul/chess-2/src'
touch .engineobjs
cc -o test main.o uci_tests.o zobrist_tests.o .engineobjs ../src/*.o -lcmocka
% ./test
[==========] Running 30 test(s).
[ RUN ] perft_unit_test1
[ OK ] perft_unit_test1
[ OK ] uci_parser_test13
...
[ RUN ] uci_parser_test14
[ OK ] uci_parser_test14
[ RUN ] zobrist_test1
[ OK ] zobrist_test1
[ RUN ] zobrist_test2
[ OK ] zobrist_test2
[==========] 30 test(s) run.
[ PASSED ] 30 test(s).
New features are created on feature branches. Before a merge to main can happen the feature branch has to run against main using cutechess-cli.
cutechess-cli -each tc=5+3 proto=uci -engine cmd=./chess2_new -engine cmd=./chess2_old -games 128 -concurrency 8 -openings file=../OpenBench/Books/Pohl.epd -sprt alpha=0.05 beta=0.05 elo0=100 elo1=200
The branch should not be merged if there is a significant ELO drop.
The scripts/bench.sh can be run against a feature branch which runs the engine with the bench argument. The script provides statistical analysis of performance improvements.