Seeing these "games" on Twetch reminded me of an old game w…

Seeing these "games" on Twetch reminded me of an old game we used to play in baseball. There is really only ONE RULE. If you figure it out... you can't reveal the solution to anyone else.

Here we go:

If 1-4 is 5,
and 3-3 is 0,
What is this 2-3?