I have a tournament soon, but how do you check what openings your opponents (soon to face) play and how to check their main weakness ans strengths can someone tell me how to access these information?

Is there any table or excel spreadsheet that shows you the comparison ratings of chesscom rapid, lichess classical lichess rapid and fide? If u have the spreadsheet can u please upload here thx

So before I got chessly and worked on my Dutch I had a 34% win rate as black at the end of November. Now I have a 40% win rate and a really high win rate in the last month. I don't even have all the theory down by heart but even knowing where to place pieces and ideas to follow has improved my game a ton Instead of being in a losing position in most of my Dutch games I now have a equal or winning position in most games. Well worth it in my opinion. The drills and quizzes also help me a ton in terms of actually understanding the opening

This was so funny I've been studying the big center variation and this guy blew it. This was the final position https://lichess.org/RW7lkqpx/white

2600 to 2700 was brutal ngl