There are some particularly good comments under that article (looks around this thread...)
Including this great one from 'Girl Scout' :
it's really simple, transwomen are male, and don't belong in female sports. Women's sports are about extraordinary females, they're not about males, not about comparing us to males, arguing whether we are as a 'good as' males, nor indeed about including males (regardless of the nebulous concept of gender identity), women's sports are about females. It's not women's job to figure out this problem, share our resources or budge over for males. And the thing that insults me the most about this entire argument is this notion that a woman is a chemically suppressed man! Greer wrote the Female Eunuch all those years ago, to settle that argument. Females exist in our own right, and it frustrates me how we are expected to accommodate this push for trans rights for males, this a problem men need to figure out 
for that girl scout!