3 drive and "broadening top/bottom" are patterns discovered 50+ years ago.
1.272 is the normal fib.
They often have a good reward/risk(big move). Last target is often 1.272 of the pattern/range on the opposite side.
FTSE and CAC 40 : broadening top. Fib ca. 1.272.
S&P500 : 3 drive, but not very good. Fib 2.000 or something.