I read about the controversy surrounding M Phelps victory in 2008 and his half stroke that shortened his last meters time.
This made me wonder: since there are different styles in competition, it means that there must be very precise criteria to differentiate them. Are there?
Someone competing for butterfly could swim freestyle (which I guess is faster) - so there must be something in the rules that describe the "limits" of a style?
If one looks at high jump for instance, the rule is to pass above the bar, the way you want. Fosbury did it differently and he win without controversy.
100 m sprint means you run as fast as you can, whether you do it on two legs or on all fours does not matter.
What I am trying to say is that in swimming there is both a clear goal (first to touch the wall) but how strictly is the style regulated as well?