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chess_alpha_beta.c
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//
// Created by wills on 3/12/
// Contains fuctions for running Alpha-Beta on chess moves
//
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "min_max.h"
#include "chess_alpha_beta.h"
#include "chess_board.h"
#include "chess_moves_save.h"
#include "chess_moves_saves_black.h"
#include "chess_moves_saves_white.h"
#include "chess_alpha_beta.h"
#define SIZE 5
#define DEBUG_IGNORE_DEPTH -1
#define REPLACEMENT_PROBABILITY 50
/**
* Internal function for running AlphaBeta treeless for chess
* @param min_or_max
* @param board
* @param top
* @param bottom
* @param depth
* @return
*/
int8_t treeless_Chess_alpha_beta_helper(char min_or_max, chessBoard board,
int8_t top, int8_t bottom, uint8_t depth) {
#ifdef DEBUG
if (depth > DEBUG_IGNORE_DEPTH) {
for (uint8_t i = 5 - depth; i > 0; i--) {
printf("\t");
}
printf("depth %d %c\n", depth, min_or_max);
}
print_board_compressed(board, 5 - depth);
#endif
if (depth > 0) {
chessMoveSave save = make_starting_save();
chessMove *move = malloc(sizeof(chessMove));
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
uint8_t run = 0;
while (save->done != 3) {
run = 1;
#ifdef DEBUG
if (depth > DEBUG_IGNORE_DEPTH) {
for (uint8_t i = 5 - depth; i > 0; i--) {
printf("\t");
}
print_move(*move);
}
#endif
run_chess_move(board, *move);
int8_t out = treeless_Chess_alpha_beta_helper(get_min_or_max(min_or_max), board, top, bottom, depth - 1);
reverse_chess_move(board, *move);
#ifdef DEBUG
if (depth > DEBUG_IGNORE_DEPTH) {
for (uint8_t i = 5 - depth; i > 0; i--) {
printf("\t");
}
printf("Score %d\n", out);
}
#endif
if (min_or_max == MIN) {
if (bottom > out) {
break_down_save(save);
free(move);
return out;
}
if (top > out) {
top = out;
}
} else {
if (top < out) {
break_down_save(save);
free(move);
return out;
}
if (bottom < out) {
bottom = out;
}
}
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
}
break_down_save(save);
free(move);
if (run) {
if (min_or_max == MIN) {
return top;
} else {
return bottom;
}
} else {
if (min_or_max == MIN) {
return KING_SCORE;
} else {
return -KING_SCORE;
}
}
} else {
#ifdef DEBUG
int8_t score = score_board(board);
if (depth > DEBUG_IGNORE_DEPTH) {
for (uint8_t i = 5 - depth; i > 0; i--) {
printf("\t");
}
printf("score %d\n", score);
}
return score;
#else
return score_board(board);
#endif
}
}
/**
* Sets up and runs Alpha-Beta on chess
* @param min_or_max
* @param board
* @param depth
* @param move_return
* @return
*/
int8_t treeless_chess_alpha_beta_random(char min_or_max, uint32_t *board,
uint8_t depth, chessMove *move_return) {
srand(time(0));
int8_t top = MAX_VALUE_DEFAULT;
int8_t bottom = MIN_VALUE_DEFAULT;
#ifdef DEBUG
printf("depth %d\n");
#endif
if (depth > 0) {
chessMoveSave save = make_starting_save();
chessMove *move = malloc(sizeof(chessMove));
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
uint8_t run = 0;
while (save->done != 3) {
run = 1;
// print_move(*move);
// for (uint8_t i = 5 - depth; i > 0; i--){
// printf("\t");
// }
#ifdef DEBUG
print_move(*move);
#endif
run_chess_move(board, *move);
int8_t out = treeless_Chess_alpha_beta_helper(get_min_or_max(min_or_max), board, top, bottom, depth - 1);
#ifdef DEBUG
printf("Score %d \n", out);
#endif
reverse_chess_move(board, *move);
if (min_or_max == MIN) {
if (bottom > out) {
break_down_save(save);
copy_move(move, move_return);
free(move);
return out;
}
if (top > out) {
copy_move(move, move_return);
top = out;
}else if (top == out && (rand() % 100) <= REPLACEMENT_PROBABILITY){
copy_move(move, move_return);
}
} else {
if (top < out) {
break_down_save(save);
copy_move(move, move_return);
free(move);
return out;
}
if (bottom < out) {
copy_move(move, move_return);
bottom = out;
}else if (bottom == out && (rand() % 100) <= REPLACEMENT_PROBABILITY){
copy_move(move, move_return);
}
}
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
}
break_down_save(save);
free(move);
if (run) {
if (min_or_max == MIN) {
return top;
} else {
return bottom;
}
} else {
move_return->startX = 0;
move_return->startY = 0;
move_return->endY = 0;
move_return->endX = 0;
move_return->taken = 15;
if (min_or_max == MIN) {
return KING_SCORE;
} else {
return -KING_SCORE;
}
}
} else {
#ifdef DEBUG
int8_t score = score_board(board);
printf("score %d\n", score);
return score;
#else
return score_board(board);
#endif
}
}
/**
* Sets up and runs Alpha-Beta on chess
* @param min_or_max
* @param board
* @param depth
* @param move_return
* @return
*/
int8_t treeless_chess_alpha_beta(char min_or_max, uint32_t *board,
uint8_t depth, chessMove *move_return) {
int8_t top = MAX_VALUE_DEFAULT;
int8_t bottom = MIN_VALUE_DEFAULT;
#ifdef DEBUG
printf("depth %d\n");
#endif
if (depth > 0) {
chessMoveSave save = make_starting_save();
chessMove *move = malloc(sizeof(chessMove));
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
uint8_t run = 0;
while (save->done != 3) {
run = 1;
// print_move(*move);
// for (uint8_t i = 5 - depth; i > 0; i--){
// printf("\t");
// }
#ifdef DEBUG
print_move(*move);
#endif
run_chess_move(board, *move);
int8_t out = treeless_Chess_alpha_beta_helper(get_min_or_max(min_or_max), board, top, bottom, depth - 1);
#ifdef DEBUG
printf("Score %d \n", out);
#endif
reverse_chess_move(board, *move);
if (min_or_max == MIN) {
if (bottom > out) {
break_down_save(save);
copy_move(move, move_return);
free(move);
return out;
}
if (top > out) {
copy_move(move, move_return);
top = out;
}
} else {
if (top < out) {
break_down_save(save);
copy_move(move, move_return);
free(move);
return out;
}
if (bottom < out) {
copy_move(move, move_return);
bottom = out;
}
}
if (min_or_max == MAX) {
get_moves_white_save(board, move, save);
} else {
get_moves_black_save(board, move, save);
}
}
break_down_save(save);
free(move);
if (run) {
if (min_or_max == MIN) {
return top;
} else {
return bottom;
}
} else {
move_return->startX = 0;
move_return->startY = 0;
move_return->endY = 0;
move_return->endX = 0;
move_return->taken = 15;
if (min_or_max == MIN) {
return KING_SCORE;
} else {
return -KING_SCORE;
}
}
} else {
#ifdef DEBUG
int8_t score = score_board(board);
printf("score %d\n", score);
return score;
#else
return score_board(board);
#endif
}
}