For example, Baseball, football (soccer) and basketball are pretty straight forward. 1 point for a run or goal in the first two, and 2 or 3 points depending upon distance for basketball with 1 point foul shot scoring. The 3 pointer is an add on rule and not from the original rules.
Rugby and the NFL gets more complicated and would like to know why they came up with the formulas they use. Is it mathematical in some way? Rugby 5+2 and 3 for a penalty. NFL 6+1 and 3 for a field goal, there are no penalties. Extra point could be 2 instead of 1 if it is a running/passing play instead of a goal kick, but that is an add-on rule and not from the original rules. No doubt once again that NFL football initially took its rules from Rugby.
Cricket I have no idea and won't even go there.

Anyway, it's interesting to think about and chat about. Pete

Edit: I forgot the drop goal in Rugby for 3 points. Matches up with the NFL field goal.The NFL also has a drop kick worth 3 points but you never see it attempted. There has been one successful drop kick in the NFL since sometime in the 1940's!
