Why is Qxd4 the best move after O-O-O? Why can't black play something like Rfb8?
Puzzle #3

Either way, O-O-O is the only move that protects both pawns, so even though, Qxd4 is not forced, O-O-O is the only good move n the pisition.
Any one giving this puzzle is very easy.
It is simple concept of chess in amateur level or intermediate level.
Black has many good move instead taking pawn Qxd4

Today's puzzle was taken from a game
I didn't make this puzzle. Qxd4 isn't the best move, but that's what happened. Either way, O-O-O is the only good move, as I said above. would you be happier if I deleted Qxd4 as a line? (Btw I mean no offense, Sorry if my comment comes out a bit rude)
Today's puzzle was taken from a game I had recently, against @Metusja
Here is the game: https://www.chess.com/game/daily/291889390
Private message me the answer to receive a fun trophy. Good luck!