I feel i should have won.

often playing 3 min games i loose even when i have taken way more peices, and with more time am confident i would have achieved chess-mate.  If the algorithms are looking for the best possible moves then why, like in this game below, am i clearly at an advantage.  I am black.

 You lost on time so it doesn't matter how good or how bad your position was. But yes, you are one move - Qg4 - from a mate.

Edit: Now I looked up your game and you actually blundered big time in your last move. You moved Qh4 but you would have won the game with Qg4.

The clock is part of the game. You can never win if you run out of time. Play longer time periods

Because I'm feeling generous this morning, I will award you a moral victory.  Unfortunately, it won't help your rating, but I want you to feel good about yourself. 

I'm pretty new to the game.  I normally play ten min so i have time to achieve checkmate. I guess i am asking why the other player won. I assume he made better traditional moves, but i still dont get how i lost looking at the final positions. That is why i rarely play three min games as if i am not super logical and calculated i wont win, even if i have take more peices and feel i am ahead.

Look it up in the rules

Your opponent was lost and you could've mated him in several ways, no matter whose move it was.  However, if you're gonna play fast games you have to realize, as well as consider while playing, that the clock is just as important (in a lot of cases even more important) as winning or losing by checkmate. 

Unfortunately, the time factor appears to precede the mate, and you did not manage to play Qg4# in time, so your opponent wins on time. A tiny bit faster, and you would probably have placed the Black queen on g4 for mate. As long as you have even a fraction of a second when landing the mate (more than 0.0 second), you will win by checkmate.

For a new player you are already doing well though, having at least some plan to go after the opponent's king. I have seen the game, and I feel that taking 21.7 seconds to play 4...Nc6 is a little too long for a 3 min game. Fortunately your opponent made the game easy for you by playing 7. Qf5, hanging the queen.

I have been in your situation before, where I did not drag my piece fast enough for mate, and likewise I have escaped a loss in a similar manner.

 Thanks for the replies guys. I'm still a little confused as to what the computer bases a win (in this case for the opponent) on when the timer runs out.  I thought it would have just been the amount of pieces taken but clearly not.  Some people are suggesting time it take to move, but I still thought the amount of pieces taken would trump this.

 I also looked up the rules as suggested but they didn't give any clarity.  

If you run out of time you lose, regardless of the position on the board or how many pieces have been taken. The only exception is if your opponent does not have enough pieces to give checkmate. Then it is a draw if you run out of time.

Rules 6.8 and 6.9 of the FIDE handbook has the rule that Strangemover describes. A consequence of that rule is that even in the position below,

if White runs out of time, Black will be declared won, since technically there are possible ways for Black to come up with a sequence of legal moves to win, howsoever stupid White's moves must be for Black to win.

Think of it this way. Imagine the following hypothetical scenario. A team working in a construction company is tasked to complete building a house that you intend to purchase. Suppose the team only completes 75 percent of the house at the deadline given, and no extension of deadline is granted. The rooftop is part of the 25 percent that is not complete. Would you pay 75 percent of the house value for the incomplete house?

in this game

https://www.chess.com/livechess/game?id=2307422714

you missed mate in 2 with 12 Bb5+ and proceeded to lose on time 3 pieces up. learn the basics of checkmate man.

as for the following

https://www.chess.com/livechess/game?id=2307374405

no comment whatsoever.

 Thanks guys I am just learning by playing lots.  So the reason I lost is simple, it was during my move that the clock ran out? That is the answer I was looking for

Yes, your clock dropped before you completed one of the moves. Unfortunately, the rules are as such. Even if you saw the mate and were dragging the Black queen g4, as long as you failed to drop the queen on g4 before the time ran out, you were considered to have lost on time. At least you had a winning position, so don't think too much about the loss on time.

8

thanks guys, appreciate all the replies

I saw only 6. Maybe I am bad.

Qf2#

Qxf4#

Qg4#

g4#

Re3#

Nd4#