Here are some cool challenges
The win streak challenge who ever loses first well loses next is The brilliant challenge it's simple and not simple the goal is to get a brilliant move before your friend if you do that you win
Elo challenge the elo challenge isn't exactly what it sounds like the goal isn't to increase elo but play higher rated players and beat them just search for a higher rated player and boom , minimum elo difference is 💯
There is the accuracy challenge play with a higher accuracy than your friends best 2/3,3/5,4/7 etc 🏆 wins similar to this one is the perfect challenge get 100% accuracy who ever gets 100% accuracy first wins but I don't recommend it
Similar to blunder is inaccuracy mistake &miss challenge the goal is to not get inacuracies (mistake/miss)first to inaccuracy loses
You can have an excellent & good move challenge but remember when playing excellent & good challenges don't try to avoid best moves I haven't figured out how to make and play these challenges
Negative challenge try not to make any bad moves (inaccuracy,mistake,miss,blunder) first to do so wins
There is a bonus to these challenges all help improve your chess skill blunder helps you to stop blundering best & accuracy may improve your tactics etc.
There is a reason the challenges are made the way they are to help improve your skills and to enjoy yourself in the process
Piece of advice: don't play to many games and don't play Brilliant and perfect challenge often the reason is because they are bad for learning ie. Brilliant challenge you may try to a random move that looks like a blunder but is a Brilliant move and we don't want to make blunder like moves until we get Brilliant if you're making a move you must understand the logic behind it
Excellent and good move challenge and positive challenge I don't know how to make and play these because let's take positive challenge for example it's like saying most or all of your moves should be positive what percentage of moves is it all of them we don't want as many good or Excellent we want to make the best moves or atleast the best move we are capable of