I picked it up about 3 years ago after decades away from the game. I rarely play a game on there (when I do it's against a bot), but I do my free puzzles each day and it's improved my game immensely (I also watch some YT creators). I'm certainly not a 2250 player, but my puzzle rating is that high; it's easier when you know the critical point of the game. By the way, people totally didn't understand the cheating scandal last year. Average people, even some top-level chess players, assumed one had to have a method to get the best move at every turn: either some secret access to an engine or an associate with an engine and a way to signal the move. Cheating could be as easy as the associate sending a signal (visual, coughing, or buzzing his pants) that tells the player he is currently facing a puzzle situation: that there is a move or series of moves that wins the game (winning a piece can win the game at those high levels).

Five consecutive squares always average to the middle square plus 2. 146 * 5 = 730. Answer = 2