The blog post explores the impact of YouTube chess tutorials on the popularity of specific chess openings, particularly focusing on the influence of popular streamers like GothamChess and Hikaru Nakamura. By analyzing over 4.3 billion games on the Lichess platform using the Elastic Stack, the post demonstrates how to calculate p-values to detect significant changes in the usage of openings like the Ponziani and London System. The findings suggest a notable increase in the Ponziani opening's popularity following a tutorial by GothamChess, as indicated by a significantly low p-value, whereas Hikaru Nakamura's video on the London System did not show a similar effect. The analysis highlights the potential influence of streamers on chess trends, though it notes that the study's scope is limited to Lichess data and rated games, and does not account for other factors like tournaments or player ratings.