As a Muslim, I know when you give up a worldly honour like a shot at championship or the championship itself, you dont do it with a heavy heart because you believe that Allah will compensate you much more than a zillion times for giving up something for Him. You actually do it happily! Its like Muhammad Ali putting everything at stake even jeopardising public opinions of his commitment to his country. So I agree they shouldnt really complain that they have been removed from a tournament or something. The organisers would most likely have valid reasons for not allowing hijab (not necessarily a prejudice against Islam or Muslims), they are all generally very strict in ensuring that everyone gets a level playing field (although if they really really tried they could find some way to accommodate the hijab); but again the woman refusing to take off her hijab has even more valid reason not to. And also she shouldnt be complaining about it because of the reason for her insistence.