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If you do nit make a move within a specific time period, you lose the game on time

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if you run out of time, you lose.  it's that simple.

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In turn-based chess:

    if you run out of time AND you're a premium member AND you have vacation time remaining THEN you get put on vacation (so the game is effectively paused)

    if your opponent DOESN'T HAVE Auto Win on Time set, THEN the game remains in a state of limbo until someone resigns OR Auto Win on Time IS switched on - (UNLESS it's a tournament game, in which case Auto Win on Time does not apply)

    if your opponent has insufficient mating material when you run out of time, the game is scored as a draw.

 

In Live Chess, different rules apply.

 

Not quite that simple, after all.

if you win on time. whats the affect on ratings ??

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A win is a win - irrespective of how it was achieved.

Hi I Want to understand how time increase in time bound games. Also why some times it sets to 10 sec remaining with every move. Is there any link where all rules regardingtime is mentioned,

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With the exception of the opponent having insufficient material such as for example all the opponent has is a K in which case even though the player has run out time the game is drawn.

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There is a bug in online, not live, chess. The player with insufficient material wins on time.

I suppose there are few bug reports as the players may not be aware the decision is wrong. http://www.chess.com/echess/game.html?id=48455511

As well the loser may no longer be here to complain. In this one someone should have known to resign: http://www.chess.com/echess/game.html?id=15671130

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Fascinating. He who hesitates [to resign] sometimes wins!

How come I have played live chess games and my opponent has run out of time and won the game and points!

There is an exception to the rule, such that if you run out of time and your opponent has insufficient material to mate, then it's declared a draw.  I played a game in which my opponent was wiped out of all pieces, and I had a passed pawn about to promote, with a light square bishop preventing his king from preventing this.  I was shocked to see the result was a draw when my clock had run out, but in a way I guess that's a fair rule.