for (y = 0; y < DVONN_BOARD_Y_SIZE; y++) {
board->cells[x][y].type = DVONN_CELL_EMPTY;
board->cells[x][y].height = 0;
for (y = 0; y < DVONN_BOARD_Y_SIZE; y++) {
board->cells[x][y].type = DVONN_CELL_EMPTY;
board->cells[x][y].height = 0;
board->cells[x2][y2].height += board->cells[x1][y1].height;
board->cells[x2][y2].type = board->cells[x1][y1].type;
board->cells[x2][y2].height += board->cells[x1][y1].height;
board->cells[x2][y2].type = board->cells[x1][y1].type;