void upgradePieces_ButtonClick(control* input)
{
char piece = ResolveLetterFromButtonName(input->name);
chosenMove->new_disc = piece;
if (is_move_in_move_list(chosenMove, curMovesList) == true){
make_move(board, chosenMove);
SwitchButtonHighlight(gameSelectedSquare_control);
gameSelectedSquare_control = NULL;
curSettings->next_turn = get_opposite_color(curSettings->next_turn);
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
free(chosenMove);
chosenMove = NULL;
Game();
}
// DrawTree
if (-1 == FlipTree(&error_global))
{
guiQuit = -1;
return;
}
}
int ComputerTurn(char** error)
{
if (gameOver == false && tie == false){
struct move_list* best_move_list = NULL;
int number_of_boards_evaluated = 0;
int current_move_grade = get_best_moves(curSettings->minimax_depth, board, get_opposite_color(curSettings->user_color), curMovesList, &best_move_list, &number_of_boards_evaluated);
// Check for errors
if (FAILED_ERROR == current_move_grade) {
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(best_move_list);
best_move_list = NULL;
*error = "ERROR: Failed getting best moves.";
return -1;
}
// Make the move
make_move(board, &best_move_list->mov);
curSettings->next_turn = get_opposite_color(curSettings->next_turn);
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
free(chosenMove);
chosenMove = NULL;
free_move_list(best_move_list);
Game();
}
return 0;
}
void GameBoardMainMenu_ButtonClick(control* input)
{
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
free(chosenMove);
chosenMove = NULL;
free(curSettings);
MainMenu();
}
void GameBoardSave_ButtonClick(control* input)
{
isSaveMode = true;
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
free(chosenMove);
chosenMove = NULL;
SaveLoadMenu();
}
static int negamax_algo(struct chessboard *c, int color, int depth, int alpha, int beta)
{
struct move_list *l;
struct raw_move m;
int n;
int val, best_val = INT_MIN;
if (!depth)
return !color ? calculate_board_heuristic(c) : -calculate_board_heuristic(c);
l = allocate_move_list();
for (int i = 0; i < 16; i++) {
n = enumerate_moves(c, (color << 4) | i, l);
expanded_moves += n;
for (int j = 0; j < n; j++) {
get_move(l, j, &m.sx, &m.sy, &m.dx, &m.dy);
execute_raw_move(c, &m);
evaluated_moves++;
val = -negamax_algo(c, !color, depth - 1, -beta, -alpha);
unwind_raw_move(c, &m);
best_val = max(best_val, val);
alpha = max(alpha, val);
if (alpha >= beta)
break;
}
}
free_move_list(l);
return best_val;
}
static void
ParseOptGameList(SourceFileType file_type)
{ Move *move_list = NULL;
while(ParseGame(&move_list) && !finished_processing()) {
if(file_type == NORMALFILE) {
DealWithGame(move_list);
}
else if(file_type == CHECKFILE) {
DealWithGame(move_list);
}
else if(file_type == ECOFILE) {
if(move_list != NULL) {
DealWithEcoLine(move_list);
}
else {
fprintf(GlobalState.logfile,"ECO line with zero moves.\n");
report_details(GlobalState.logfile);
}
}
else {
/* Unknown type. */
free_tags();
free_move_list(move_list);
}
move_list = NULL;
setup_for_new_game();
}
}
/* Break up a single line of moves into a list of moves
* comprising a positional variation.
* In doing so, set GlobalState.depth_of_positional_search
* if this variation is longer than the default.
*/
static Move *
compose_positional_variation(char *line)
{ char *move;
/* Build a linked list of the moves of the variation. */
Move *head = NULL, *tail = NULL;
Boolean Ok = TRUE;
/* Keep track of the depth. */
unsigned depth = 0;
move = strtok(line," ");
while(Ok && (move != NULL) && (*move != '*')){
if((move = strip_move_number(move)) == NULL){
/* Only a move number. */
}
else{
Move *next = decode_move((unsigned char *) move);
if(next == NULL){
fprintf(GlobalState.logfile,"Failed to identify %s\n",move);
Ok = FALSE;
}
else{
/* Chain it on to the list. */
if(tail == NULL){
head = next;
tail = next;
}
else{
tail->next = next;
tail = next;
}
next->next = NULL;
}
depth++;
}
/* Pick up the next likely move. */
move = strtok(NULL," ");
}
if(Ok){
/* Determine whether the depth of this variation exceeds
* the current default.
* Depth is counted in move pairs.
* Add some extras, in order to be surer of catching transpositions.
*/
depth = ((depth+1) / 2) + 4;
if(depth > GlobalState.depth_of_positional_search){
GlobalState.depth_of_positional_search = depth;
}
}
else{
if(head != NULL){
free_move_list(head);
}
head = NULL;
}
return head;
}
void
add_positional_variation_from_line(char *line)
{
if(non_blank_line(line)){
Move *next_variation = compose_positional_variation(line);
if(next_variation != NULL){
/* We need a NULL fen string, because this is from
* the initial position.
*/
store_hash_value(next_variation,(const char *)NULL);
free_move_list(next_variation);
/* We need to know globally that positional variations
* are of interest.
*/
GlobalState.positional_variations = TRUE;
}
}
}
/* Returns sx|sy|dx|dy in an integer byte-by-byte from least to most
* significant, indicating which move should be made next.
*
* We seperate the initial iteration of negamax out like this to track the
* actual move associated with the best score. Doing so during the
* deeper iterations is a waste of time. */
unsigned int calculate_move(struct chessboard *c, int color, int depth)
{
struct move_list *l;
int n, fbsx = -1, fbsy = -1, fbdx = -1, fbdy = -1;
int val, best_val = INT_MIN, alpha = INT_MIN, beta = INT_MAX;
struct raw_move m;
struct timespec *t;
expanded_moves = 0;
evaluated_moves = 0;
t = start_timer();
l = allocate_move_list();
for (int i = 0; i < 16; i++) {
n = enumerate_moves(c, (color << 4) | i, l);
expanded_moves += n;
for (int j = 0; j < n; j++) {
get_move(l, j, &m.sx, &m.sy, &m.dx, &m.dy);
execute_raw_move(c, &m);
evaluated_moves++;
val = -negamax_algo(c, !color, depth - 1, -beta, -alpha);
alpha = max(alpha, val);
if (val > best_val) {
best_val = val;
fbsx = m.sx;
fbsy = m.sy;
fbdx = m.dx;
fbdy = m.dy;
}
debug("Move %d/%d for piece %d (%d,%d) => (%d,%d) has heuristic value %d\n", j + 1, n, (color << 4) | i, m.sx, m.sy, m.dx, m.dy, val);
unwind_raw_move(c, &m);
}
}
free_move_list(l);
expanded_moves += n;
debug("Evaluated %luM/%luM expanded moves in %lu seconds\n", evaluated_moves / 1000000, expanded_moves / 1000000, get_timer_and_free(t) / 1000);
return (fbsx) | (fbsy << 8) | (fbdx << 16) | (fbdy << 24);
}
void GameBoardSquare_ButtonClick(control* input)
{
if ((curSettings->next_turn == curSettings->user_color || curSettings->game_mode == TWO_PLAYERS_GAME_MODE || isUpgrade) && gameOver == false){
if (input == gameSelectedSquare_control)
{
switchOffAllButtons();
gameSelectedSquare_control = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
}
else if (gameSelectedSquare_control == NULL)
{
position chosenPos = GetPosOfSquare(input);
if (is_piece_of_color(get_piece(board, chosenPos), curSettings->next_turn) == true){
SwitchButtonHighlight(input);
gameSelectedSquare_control = input;
get_moves_from_pos(curMovesList, chosenPos, &posMovesFromCurPos);
HightlightPosMoves(posMovesFromCurPos);
}
}
else if (gameSelectedSquare_control != NULL)
{
position startPos = GetPosOfSquare(gameSelectedSquare_control);
position endPos = GetPosOfSquare(input);
chosenMove = (move*)(calloc(1, sizeof(move)));
if (chosenMove == NULL)
{
guiQuit = -1;
return;
}
chosenMove->start_pos = startPos;
chosenMove->end_pos = endPos;
chosenMove->new_disc = EMPTY;
if (is_move_in_move_list(chosenMove, curMovesList) == true){
if (isPawnUpgradePossible(chosenMove, board[(int)startPos.col][(int)startPos.row]) == true){
if (-1 == DrawPiecesOnSidePanelFilterColor(tree->children[0], &upgradePieces_ButtonClick, curSettings->next_turn, &error_global))
{
free(chosenMove);
chosenMove = NULL;
guiQuit = -1;
}
isUpgrade = true;
}
else
{
make_move(board, chosenMove);
SwitchButtonHighlight(gameSelectedSquare_control);
gameSelectedSquare_control = NULL;
curSettings->next_turn = get_opposite_color(curSettings->next_turn);
free_move_list(curMovesList);
curMovesList = NULL;
free_move_list(posMovesFromCurPos);
posMovesFromCurPos = NULL;
free(chosenMove);
chosenMove = NULL;
Game();
return;
}
}
}
// DrawTree
if (-1 == FlipTree(&error_global))
{
guiQuit = -1;
return;
}
}
}
int HighlightBestMove(int blinknum, char** error)
{
struct move_list* best_move_list = NULL;
int number_of_boards_evaluated = 0;
// Get the best next move
int current_move_grade = get_best_moves(curSettings->minimax_depth, board, curSettings->next_turn, curMovesList, &best_move_list, &number_of_boards_evaluated);
// Check for errors
if (FAILED_ERROR == current_move_grade) {
free_move_list(best_move_list);
return -1;
}
move bestMove = best_move_list->mov;
position startPos = bestMove.start_pos;
position endPos = bestMove.end_pos;
control* startSquare = buttonsBoard[(int)startPos.col][7 - (int)startPos.row];
control* endSquare = buttonsBoard[(int)endPos.col][7 - (int)endPos.row];
bool startHiglighted = startSquare->ishighlighted;
bool endHiglighted = endSquare->ishighlighted;
startSquare->ishighlighted = 1;
endSquare->ishighlighted = 1;
for (int i = 0; i < blinknum; i++){
SwitchButtonHighlight(startSquare);
SwitchButtonHighlight(endSquare);
if (isPawnUpgradePossible(&bestMove, get_piece(board, startPos)))
{
char* fileName = ResolveFileNameFromLetter(bestMove.new_disc);
char* name = ResolveNameFromLetter(bestMove.new_disc);
if (fileName != NULL){
control* chessPiece_control;
if (-1 == Create_panel_from_bmp(
fileName,
name,
(Sint16)(GAMEBOARDBACKGROUND_W - BUTTON_W - MARGIN),
(Sint16)(0.5*BOARD_H - SQUARE_H - 0.5),
(Uint16)SQUARE_W,
(Uint16)SQUARE_H,
&chessPiece_control, error))
{
return -1;
}
UINode* chessPiece_node;
if (-1 == CreateAndAddNodeToTree(chessPiece_control, tree->children[0], &chessPiece_node, error))
{
FreeControl(chessPiece_control);
return -1;
}
}
}
// DrawTree
if (-1 == FlipTree(error))
{
return -1;
}
SDL_Delay(250);
}
startSquare->ishighlighted = startHiglighted;
endSquare->ishighlighted = endHiglighted;
free_move_list(best_move_list);
return 0;
}
int calculate_score_for_board_alpha(Disc board [BOARD_SIZE][BOARD_SIZE],int depth, int current_player, int alpha, int beta) {
int is_max=0, temp = 0, current_depth = depth;
Disc copy [BOARD_SIZE][BOARD_SIZE];
int temp_score =0;
Move* curr_suggested_move =NULL;
MoveList* moves_for_all_discs_this_turn = NULL, *curr =NULL;
is_max = (current_player == global_current_player) ? 1 :-1;
if (depth >=curret_max_depth || (global_max_depth ==5 && count > max_board_count))
{
temp = get_discs_board_score_for_player(board, global_current_player);
return temp;
}
update_all_legal_moves_for_player(board, current_player);
moves_for_all_discs_this_turn = collect_all_moves_for_player(board, current_player);
if (moves_for_all_discs_this_turn==NULL || moves_for_all_discs_this_turn->m ==NULL)
{
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return (-600)*(is_max);
}
if (is_max ==1)
{
curr = moves_for_all_discs_this_turn;
while (curr !=NULL)
{
if (global_max_depth ==5 && count > max_board_count)
{
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return alpha;
}
count++;
copy_board_from_copy(board, copy);
curr_suggested_move = curr->m;
make_turn_for_player(copy,curr_suggested_move,current_player);
temp_score = calculate_score_for_board_alpha(copy, current_depth+1, (current_player)*(-1), alpha, beta);
if (temp_score >= beta)
{
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return beta;
}
if (temp_score > alpha)
{
alpha = temp_score;
}
curr = curr->next;
}
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return alpha;
}
else
{
curr = moves_for_all_discs_this_turn;
while (curr !=NULL)
{
if (global_max_depth ==5 && count > max_board_count)
{
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return beta;
}
count++;
copy_board_from_copy(board, copy);
curr_suggested_move = curr->m;
make_turn_for_player(copy,curr_suggested_move,current_player);
temp_score = calculate_score_for_board_alpha(copy, current_depth+1, (current_player)*(-1), alpha, beta);
if (temp_score <= alpha)
{
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return alpha;
}
if (temp_score< beta)
{
beta = temp_score;
}
curr = curr->next;
}
free_all_optional_moves_for_player(board, current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
return beta;
}
return 5000;
}
Move* MaxMove (Disc board [BOARD_SIZE][BOARD_SIZE],int current_player) {
Disc copy [BOARD_SIZE][BOARD_SIZE];
int temp_score =0, alpha =-1000;
Move* best_move =NULL;
Move* curr_suggested_move =NULL;
MoveList* moves_for_all_discs_this_turn = NULL, *curr =NULL;
count =0;
update_all_legal_moves_for_player(board, current_player);
moves_for_all_discs_this_turn = collect_all_moves_for_player(board, current_player);
if (global_max_depth == 5)
{
curret_max_depth = calculate_current_best_max_depth(board);
}
else
{
curret_max_depth = global_max_depth;
}
curr = moves_for_all_discs_this_turn;
while (curr !=NULL && curr->m !=NULL)
{
copy_board_from_copy(board, copy);
curr_suggested_move = curr->m;
make_turn_for_player(copy,curr_suggested_move,current_player);
if (global_max_depth ==5 && count > max_board_count)
{
free_all_optional_moves_for_player(copy,current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
printf ("%lu\n",count);
return best_move;
}
count++;
temp_score = calculate_score_for_board_alpha(copy, 0, current_player*-1, -1000, 1000);
if (temp_score >= alpha)
{
if (best_move !=NULL)
{
free_move(&best_move);
best_move = NULL;
}
best_move= init_move_from_int_arrs(curr_suggested_move->from, curr_suggested_move->to);
alpha =temp_score;
}
curr = curr->next;
}
free_all_optional_moves_for_player(copy,current_player);
free_move_list(moves_for_all_discs_this_turn);
moves_for_all_discs_this_turn = NULL;
curr= NULL;
printf ("%lu\n",count);
return best_move;
}
int get_move_score_using_minimax( int max_depth,
char board[BOARD_SIZE][BOARD_SIZE],
COLOR current_color,
COLOR run_for_color,
int current_depth,
struct move_list* move_list,
int alpha, int
beta,
int* number_of_boards_evaluated) {
bool maximizingPlayer = current_depth % 2 == 0 ? true : false;
int grade = 4000;
if (maximizingPlayer) {
grade *= -1;
}
struct move_list* current_move_node = move_list;
do {
// Temp board for current move
char minimax_board[BOARD_SIZE][BOARD_SIZE];
(*number_of_boards_evaluated)++;
// Copies the board to a temp board
copy_boards(board, minimax_board);
// Make the move we want to check
make_move(minimax_board, ¤t_move_node->mov);
int score = get_board_score_for_color(minimax_board, run_for_color);
int current_move_grade = FAILED_ERROR;
// Stop condition - if we got to the max depth or there is a winner
if (max_depth == current_depth + 1 || WIN_SCORE == score || LOSE_SCORE == score) {
current_move_grade = score;
}
else {
// Get the color of the next turn
COLOR next_color = get_opposite_color(current_color);
// Get the move list for the next turn
struct move_list* minimax_move_list = NULL;
if (-1 == get_moves_for_color(minimax_board, next_color, &minimax_move_list)) {
// get_moves_for_color failed
return FAILED_ERROR;
}
// Checks if there is no moves for the next turn
if (NULL == minimax_move_list) {
current_move_grade = score;
}
else {
// Run minimax again with the new board and position
current_move_grade = get_move_score_using_minimax(max_depth, minimax_board, next_color, run_for_color, current_depth + 1, minimax_move_list, alpha, beta, number_of_boards_evaluated);
free_move_list(minimax_move_list);
// If return value is FAILED_ERROR there was an error with a standard function
if (FAILED_ERROR == current_move_grade) {
return FAILED_ERROR;
}
}
}
if (maximizingPlayer) {
grade = grade > current_move_grade ? grade : current_move_grade;
alpha = alpha > grade ? alpha : grade;
}
else {
grade = grade < current_move_grade ? grade : current_move_grade;
beta = beta < grade ? beta : grade;
}
if (beta <= alpha) {
break;
}
} while (NULL != (current_move_node = current_move_node->next));
return grade;
}
int get_best_moves( int max_depth,
char board[BOARD_SIZE][BOARD_SIZE],
COLOR run_for_color,
struct move_list* move_list,
struct move_list** best_move_list,
int* number_of_boards_evaluated) {
int grade = -4000;
int current_depth = 0;
struct move_list* current_move_node = move_list;
do {
// Temp board for current move
char minimax_board[BOARD_SIZE][BOARD_SIZE];
(*number_of_boards_evaluated)++;
// Copies the board to a temp board
copy_boards(board, minimax_board);
// Make the move we want to check
make_move(minimax_board, ¤t_move_node->mov);
int score = get_board_score_for_color(minimax_board, run_for_color);
int current_move_grade = FAILED_ERROR;
// Stop condition - if we got to the max depth or there is a winner
if (max_depth == current_depth + 1 || WIN_SCORE == score || LOSE_SCORE == score) {
current_move_grade = score;
}
else {
// Get the color of the next turn
COLOR next_color = get_opposite_color(run_for_color);
// Get the move list for the next turn
struct move_list* minimax_move_list = NULL;
if (-1 == get_moves_for_color(minimax_board, next_color, &minimax_move_list)) {
// get_moves_for_color failed
return FAILED_ERROR;
}
// Checks if there is no moves for the next turn
if (NULL == minimax_move_list) {
current_move_grade = score;
}
else {
// Run minimax again with the new board and position
current_move_grade = get_move_score_using_minimax(max_depth, minimax_board, next_color, run_for_color, current_depth + 1, minimax_move_list, ALPHA_INIT, BETA_INIT, number_of_boards_evaluated);
free_move_list(minimax_move_list);
// If return value is FAILED_ERROR there was an error with a standard function
if (FAILED_ERROR == current_move_grade) {
return FAILED_ERROR;
}
}
}
// Update the grade if it the first move or take the max grade or the min grade according to the depth
if (current_move_grade >= grade) {
if (current_move_grade > grade) {
free_move_list(*best_move_list);
*best_move_list = NULL;
}
struct move_list* temp = add_new_move_node(*best_move_list, current_move_node->mov.start_pos, current_move_node->mov.end_pos, current_move_node->mov.new_disc);
if (NULL == temp) {
return FAILED_ERROR;
}
*best_move_list = temp;
grade = current_move_grade;
}
} while (NULL != (current_move_node = current_move_node->next));
return grade;
}