Is This Unsportsmanlike?

To abandon a game instead of lose gracefully? Yes, I would consider that unsportsmanlike.

Did he violated the fair play policy? Of course he did! He has more time than me, and looking at the board, he is clearly losing the game, rather, he has a lost game!

Lose gracefully! Yes, it should be innate to all chess players!

Why? Because we will win some and lose some if we will play chess!

If he abandoned the game that is the definition of unsportsmanlike-he could have resigned...that wouldnt be unsportsmanlike

Never resign!  Play on to the death!

Yes! Never quit! Let him share your agony of losing , with him the agony of anxiously waiting for the clock to declare him the winner!

Is that it?

As I see it, he did not resign, BUT neither did he play on to the death, being checkmated! That could have been better!

The answer is:  You do not know.  Maybe it was unsportsmanlike.  And maybe some kid got hit by a car outside and he decided calling 911 was more important than finishing your game.

If it's part of a pattern, the site will detect that and take action without you doing anything.

Well, if you put it that way, that he has an emergency to attend to, I submit!

But I highly doubt that! 

in every book i read i see games where it say black/withe abandon , i have never see any remarks about the GM been unsportsmanlike, i think its part of the game .

Mi amigo, you are claiming that in all the books you have read, you see games that were abandoned, meaning the losing players, GMs at that, instead of resigning, just left their tables and abandoned their games, is that what you are saying?

Wow! That is quite interesting to know!

Resignation is not unsportsmanlike. It is admitting defeat. However, to simply ignore the game is completely the opposite. It forces the winning player to wait to see if they are going to make a move, and it says that you do not even have the grace to say you were defeated.

In some circumstances it could be excused, like the example of an emergency, but you could still apologise later by messaging the person.

So, yes, it is unsportsmanlike.

I believe in the famous Steinitz vs Von Bardelen game in 1890something Von Bardelen resigned the game by leaving the tournament hall and not returning when he saw the nice checkmate that awaited him. Given that his name is only really known because of this game it would have been wiser to allow the nice mate and lose with dignity to one of the best players of all time as this would have been no disgrace. However I don't know of any other top level games where this happened. I have heard a story, possibly an exaggeration, that Korchnoi and Petrosian resorted to kicking each other under the table during one match. Definitely unsportsmanlike! 

Abandoning the game is supposed to be tracked by chess.com, so it is supposed to be worst for them than resigning.  I wonder how true this really is.

Abandoning a lost game is resigning without telling your opponent. Kind of trying to keep it as a secret to your opponent. Unsportsmanlike, yes.

Maybe their house exploded?  It's also possible that aliens abducted their whole neighborhood.

Other possibilities are that they were on a phone and lost connection, but that's a pretty big coincidence.

your opponent sets up a winning position.He knows u pretty much can see WHATS UP,and since u both KNOW the same thing the best response is--none ?

@kempo...sorry, don't agree, whether your sitting in a tournament hall or playing on-line, your opponent deserves some respect. The medium of interaction shouldn't change the way you conduct yourself. By the way I can understand the analogy of playing a video game if ur playing a computer but not when it's a person.