It’s important to note that for juniors aged up to 18 with a rating below 2300 the “K factor” is 40, so that every point they gain beyond the expected result based on their rating is multiplied by 40 (before the changes approved by FIDE over the summer it was only 15). In Batumi Parviz scored 5.27 more points than expected, which when multiplied by 40 gives that remarkable 211 points.
See article.