+#include <stdbool.h>
+
+#include "constants.h"
+#include "list.h"
+
+/* linked list of can play shots */
+struct shots_list_s {
+ struct list_head list;
+ int y;
+ int x;
+ unsigned int type; /* can be white or black or hint allowed or hint_fordidden */
+};
+
+unsigned int current_player(unsigned int round_count);
+unsigned int eval_winner(unsigned int nb_white, unsigned int nb_black);
+
+void zero_pawns(unsigned int pawn_array[board_size][board_size]);
+void init_pawns(unsigned int pawn_array[board_size][board_size]);
+unsigned int get_box_value(int y, int x, unsigned int pawn_array[board_size][board_size]);
+void set_pawn(int y, int x, unsigned int type, unsigned int pawn_array[board_size][board_size]);
+
+bool is_box_type(int y, int x, unsigned int pawn_array[board_size][board_size], unsigned int type);
+bool is_board_full(unsigned int pawn_array[board_size][board_size]);
+
+unsigned int count_pawns_type(unsigned int pawn_array[board_size][board_size], unsigned int type);
+
+bool is_legal_shot(int y, int x, unsigned int current_player, unsigned int pawn_array[board_size][board_size]);
+unsigned int valid_shot(int y, int x, unsigned int current_player, unsigned int pawn_array[board_size][board_size]);
+
+void build_playable_shots_list(unsigned int current_player, struct shots_list_s* shots_list, unsigned int pawn_array[board_size][board_size]);
+void free_shots_list(struct shots_list_s* shots_list);
+