Re your post 49, I thank you for a clear description of the slider. Now I understand.
In my 40s I once had the experience of batting against an aging former major league pitcher (if the OP’s memory was worth a damn I could give you the name...but alas). He threw me an assortment of stuff (probably included the slider) and I trudged back to the dugout.
That’s a cool story. You are one of the few who knows what it’s like to face really good pitching. I could never get past fast stuff, it just looks like aspirin tablets going past. I never saw good breaking stuff, I’m sure I would have been diving out of the box.
Freegards