a question/request regarding the "advanced search" in the user profile page

am i missing something or is it not possible to filter by opening?
i think that should be implemented (and im really confused why it isnt already...)

i wanted to check my games where i played against the fried liver attack as black but that wasnt possible and thats how i found out about it

Yes this would be probably very easy to add and very useful, as I find myself wanting to just see what did I do wrong and right in a specific variation and it's hard to filter those dozen games within hundreds of others....so yes, please add search by ECO code (possibly range of ECO, like C15-C19 for the French Winawer)