It probably has to do with the fact that if the queen captures then the e4 pawn is undefended. Also your c pawns are doubled, so they're a bit redundant. Trading one of them for black's e pawn is tempting even if the "tactic" ends there.
Anyway click this button.
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That makes a lot of sense! Not only would the black pawn be undefended, but a capture with the rook would put the black king in check, that might contribute to the position.
I did check the line, but it still didn't seem like it was favourable to me.
Thank you for responding!
Yeah, sometimes the analysis is a bit silly. All it knows is that the number is 4.00 in white's favor, so it calls it a "missed win." Sometimes a "missed win" is you capture a rook for free, and sometimes it's only a "win" after a long complicated line that no human would play.
So if the line is confusing, it's best to ignore it. Just pay attention to the basic things, like you said, you put the black king in check, or like I said, trading a redundant c pawn for one of black's center pawns is nice.
You have a strong mating attack if Qxc4, black has to lose material to survive.
That's a good example of an engine line almost no one would play 
If it were the only way to win, sure, some tactically strong players would find it, but for example after 4.Bh6 white is permanently ahead i.e. you don't have to sacrifice a knight and see some complicated thing.
Why wouldn't Qxd3 on move 2 if white doen Nd2?
Hey all,
Just played a game against the adaptive 1600 chess.com bot, Devon.
In the game review, the engine flagged one of my moves as a missed win, and then told me that moving c4 to attack the bot's queen was the best move. However, it seems as though black's queen can just capture the attacking pawn, and still be in a fine position. Is there something I'm missing here? As a side note, I'm also fairly new to chess and chess.com.
Thank you!