stellar

UCI Chess engine written in C++20
git clone git://git.dimitrijedobrota.com/stellar.git
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commit40ec0f1a8e50396cea47115cda5943fcaa6efbf5
parent05d6b505d3935ba4ee5fe030f649aa138b9b8c6b
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateSat, 5 Aug 2023 14:34:55 +0200

Aspiration Window, UCI skip unknown

Diffstat:
MCMakeLists.txt|+-
Msrc/engine/engine.c|++++++++++++++++++++++++----------

2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt

@@ -3,7 +3,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

project(
Stellar
VERSION 0.0.12
VERSION 0.0.13
DESCRIPTION "Chess engine written in C"
HOMEPAGE_URL https://git.dimitrijedobrota.com/stellar.git
LANGUAGES C

diff --git a/src/engine/engine.c b/src/engine/engine.c

@@ -17,6 +17,9 @@

#define FULL_DEPTH 4
#define REDUCTION_LIMIT 3
#define INFINITY 50000
#define WINDOW 50
typedef struct Stats Stats;
struct Stats {
long nodes;

@@ -231,12 +234,19 @@ void move_print_UCI(Move move) {

void search_position(const Board *board, int depth) {
Stats stats = {0};
for (int crnt = 1; crnt <= depth; crnt++) {
int alpha = -INFINITY, beta = INFINITY;
for (int crnt = 1; crnt <= depth;) {
stats.follow_pv = 1;
int score = negamax(&stats, board, -50000, 50000, crnt);
int score = negamax(&stats, board, alpha, beta, crnt);
if (score <= alpha || score >= beta) {
alpha = -INFINITY;
beta = INFINITY;
}
alpha = score - 50;
beta = score + 50;
printf("info score cp %4d depth %2d nodes %10ld pv ", score, crnt,
printf("info score cp %d depth %d nodes %ld pv ", score, crnt,
stats.nodes);
for (int i = 0; i < stats.pv_length[0]; i++) {

@@ -244,6 +254,8 @@ void search_position(const Board *board, int depth) {

printf(" ");
}
printf("\n");
crnt++;
}
printf("bestmove ");

@@ -381,13 +393,16 @@ Board *Instruction_parse(Instruction *self, Board *board) {

}
if (strcmp(token, "go") == 0) {
token = Instruction_token_next(self);
int depth = 6;
if (token && strcmp(token, "depth") == 0) {
token = Instruction_token_next(self);
depth = atoi(token);
} else {
printf("Unknown argument after go\n");
for (token = Instruction_token_next(self); token;
token = Instruction_token_next(self)) {
if (token && strcmp(token, "depth") == 0) {
token = Instruction_token_next(self);
depth = atoi(token);
} else {
printf("Unknown argument %s after go\n", token);
}
}
search_position(board, depth);
continue;

@@ -402,7 +417,6 @@ Board *Instruction_parse(Instruction *self, Board *board) {

print_info();
continue;
}
} while ((token = Instruction_token_next(self)));
return board;