Yeah, I turned on a feature in 2.4.3 that should warn you with a formula error if you use an unrecognized variable. This should help people to recognize when they mis-type a variable name, for example. Problem occurs when you have a formula like this:
assign("x", points * 3)
x + 5
This will produce an error even though this is a valid formula because, to the formula "compiler", the variable "x" is unrecognized. It was a mistake - I should have documented the reason I had left the feature turned off in the first place.
In the case of the "points" variable, it is actually a bug because it should recognize points. It has to do with the formula test dialog being used in more than one place (on the Game tab and in the Filters dialog). I think I failed to add "points" as a valid variable for the Tournament Score dialog.
Your formula will of course still work, but the test dialog will give an error. Not a good thing, but at least I didn't break the formula itself.