I am totally, absolutely and completely left-handed (and left-footed). My grandad was obliged to write with his right hand, and ended up completely ambidextrous. I never got to play hockey or golf because, way back then, there were no left handed sticks or clubs. One of my sons is a lefty, the other two are right-handed. However, the youngest (who is a great footballer/soccer player) can dribble, control, run and shoot the ball with both left and right .
My piano teacher used to make me do studies by Ernő Dohnányi, because I couldn´t do that. More excruciating than the Algerian Hook torture!!lift my fourth fingers well over an inch without lifting any other fingers, which most people cannot do.

Those around here for longer know. But I will see if I can still do it.