It's fair for Kate to compete as she's playing within the current rules. I think she should take the higher road and decide on her own not to compete, but it's the rules that need to be changed. And if you truly believe that there's some magic way to make someone go from being a male to being on a fair level with females you are the one that needs to do some research. At best this will be like Dash in the Incredibles movie trying to race against other kids with his parents saying not too fast and then telling him not that slow. At what point do we decide we've chemically limited the performance of a transgender athlete enough? I think from the track record so far in various sports it's obvious that male to female transgender athletes have a performance advantage. Kate was previously an average male downhill racer and then now is a top level women's racer. Are you telling me if a top 10 male downhill racer transitioned, by the current rules, that they wouldn't absolutely dominate Womens downhill racing? So what do we do? Chemically limit the performance of male to female transgender athletes even more? How do we accurately determine when we've handicapped someone's performance enough? This doesn't even deal with the potential helth effects of trying to make a human being artificially stay within some parameters made up by a sports organisation. Males, evendors while still in the womb, have measurable physical differences that cannot be undone in any predictable way. Muscle mass, bone structure, visual acuity, etc... there is no way to ever in some accurately measurable way transition a male to female and be able to say there isn't an advantage.