This is JOKES. I have ADHD - I find that ritalin REDUCES my chess abilities! Not by a small amount either, by loads!!! How do I know this? Because on chess.com

This is JOKES. I have ADHD - I find that ritalin REDUCES my chess abilities! Not by a small amount either, by loads!!! How do I know this? Because on chess.com my scores start rapidly decreasing, it takes me too long to make a move, I'm overthinking my moves too much, trying to find ONE move rather than my adhd brain letting me find 5 moves simultaneously. It took me a long time to realise this was happening! And actually other drugs can make me better - but definitely not anything stimulant based. My point is - this study is not scientifically rigourous and it is not enough to draw conclusions.