#define BOARD_WIDTH 2
#define BOARD_ROW_BYTES ((BOARD_WIDTH * 2) + 1)
#define BOARD_BYTES BOARD_ROW_BYTES * BOARD_ROW_BYTES

char EMPTY = ' ';
char FORBIDDEN = ' ';

int neighbor_increments[] = {
  - BOARD_ROW_BYTES,
    1,
    BOARD_ROW_BYTES,
  - 1
};

// Board
void initialize_board(char* board);

void print_board(char* board);

// Moves
int is_allowed_placement(char* tile, int position, char* board);

int is_center_position(int position);

int place_tile(char* tile, int position, char* board);