Why does white win?

Hi, I played a 10 min game (I was black), but the game ended with "white wins at time-out".

I wonder why. The number of captured pieces doesn't matter apparently?

Update: it seems that 10 min game means you have 10 mins to play your pieces so I ran out of time, which means the other one wins: https://www.chess.com/forum/view/general/what-is-the-meaning-of-game-won-on-time#:~:text=If%20you%20win%20on%20time,That's%20it.

This is so, even if the opposing player only has a pawn.

Note, however, that there are certain conditions on this site which cause some games to be draws. For example, if the player having the time has only a king and a knight left, the game is a draw (even if checkmate is theoretically possible).

Chess cannot easily be scored from # of pieces taken because you can intentionally lose pieces to win, and if that process ended early, you could have been on your way to a win but lost due to your approach if you scored off pieces taken.   Analysis with the computer takes this into account: if you capture a knight you get 3 points all other things being equal, but if taking it put you in a bad position (say taking it uncovered your queen and now you lose her!!) it instead tells you that your score went down even though you took a piece.   Its just too complex to score like that. 

Winning in chess is simple.   You can win in 3 major ways (ignoring tournament rule triggers like cheating, judgement calls or weird stuff):  you checkmate your opponent, your opponent resigns, or your opponent ran out of time.   Draws are more complex, ranging from agreement to repeated positions to lack of material (eg 2 kings can't kill each other) to inability to move (can't move into check and nowhere else to go, technically stalemate vs draw are different but same end result, no winner).  I would review the CDC tutorials on these topics if you need to, and if you plan to play in a tournament, review those rules as well (this is tedious, but you should still do it once in a while if playing in them, no one wants to lose on a technicality). 

When you select a time control you are agreeing to complete ALL of your moves within the time constraint.  If you fail to do that, you lose.  The clock is part of the game.  Faster time controls means you play more games, slower time controls means you have more time to think and play better moves.

Otherwise, the time control would be meaningless.  Imagine someone getting a slight lead, and then just letting the clock run out expecting to be granted the win.  That wouldn't be fair to the opponent who is moving quickly to stay within the time limits.