https://www.wishingwealthblog.com/2022/08/blog-post-bloody-fridays-typically-lead-to-weak-monday-openings-as-in-october-1987-43-new-highs-and-206-new-lows-gmi2-and-could-turn-red-by-mondays-close/
Blog Post; Bloody Fridays typically lead to weak Monday openings, as in October 1987; 43 new highs and 206 new lows; GMI=2 and could turn Red by Monday's close