There's a very interesting article in the Mail, by Linda Duffy, a sports psychologist. She sets out exactly how males - including TW - out-perform women in darts and why they shouldn't be competing against women:
https://www.dailymail.co.uk/sport/darts/article-13400039/Former-world-No-1-sports-psychology-expert-reveals-scientifically-UNFAIR-transgender-darts-players-compete-female-events-Deta-Hedman-Denmark-Open-withdrawal.html
^She added: 'When you start to talk about these very contentious issues, the first thing people will say is: "You're you're bigot. You don't like transgender people." It's not. We have to look aside from that. It's not about being transgender. It's not about that at all. It's about the fairness of the category.'
Duffy drew on her experience from playing the sport in her study and concluded that there are significant physical and psychological disparities between male and female athletes that place the latter at a disadvantage when it comes to competition.
'There are massive differences between males and females on cognitive abilities and visual-spatial ability,' she said. 'You know lots of different ways that we do things. A lot of those are underpinned by testosterone levels. Some are not.'
Her analysis spanned across different studies, with one relating to controlling variables such as height, arm length and experience. Another related to differences between male and female darts players across varying levels of skill. A different study analysed whether practice can affect the advantage one sex could have over the other using a single dart average as a measure.^
^Each of her studies revealed discrepancies between the two genders, with male darts players being superior to female players included in the examination.
'First of all you have to say. Do you think that a transgender person is a biological man or biologically female? That's the starting point for any of this and I can't really speak on individual cases, because I don't know their status. ^
'But if you accept that a transgender participant is a biological man - even though they identify as a woman - they have an advantage, an unfair advantage against females, therefore, shouldn't be playing in the female category. So you're looking at either inclusion or fairness. You can't have both.