JMHO - but it gets tricky in real time picking on SP alone or indeed using SP as a filter anywhere.
Sounds like it would be easy but many many times they hover on the border and you dont know until its over.

In any case JMHO again - but slicing out a section of SP for your selections in any range is data back fitting in its finest.
may work for 800 days or another 2000 days and then not work for 10 years.

as i've said somewhere else i have reasonable data going back to 1992 and you would be surprised to see some methods like this work solid for 3-4 years and then drop and fade and never come back.

but the main thing about simple methods - mmm- not sure about that either -they win- yes - but are overbet because they are so simple that every one is on them.


opinions only - agreement not required.