user16057: One of my opponents at chess.com just stopped moving after falling into objectively losing position, refused to resign, and made me wait for 20 minutes to claim a win by time.
I've recently resumed my online chess activity and I have experienced this childish behavior of some online chess players several times already.
Does chess.com's engine detect such unsportsmanlike behavior? Or is there a way to flag such users, so that they could be punished? What is the proper etiquette for us to proceed in such cases?
Here's the game position when my opponent stopped moving and refused to resign:
[Title "Me vs Malicious Player"]
[FEN "8/7P/2k1p3/p3P3/Pp1K2P1/1P6/8/8 w - - 0 44"]


user12873: Unfortunately there isn't much you can do to make the game end immediately. If you care about your online rating and don't want to do something like offer a draw, you'll have to wait. I'd suggest doing something else that you need to do with that time.
After the game though, there is plenty you can do. The best course of action would be reporting the user to Chess.com, explaining how they made you wait 20 mins. For proof, you could take a screenshot of your game when your opponent has 15 minutes, and another screenshot when he runs out of time. This will show Chess.com it is the same position, and that your opponent just let the clock run down.
Additionally, you can block the user so that you never play them again. This will save you some time in the future, if you get paired again.
Here's Chess.com's link on how to deal with unfair players. They give instructions on how to report a player, as well as other things:
https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know

user14079: Time for an update: Chess.com has just released a new formular for reporting abusing players.
It includes a category "poor sportsmanship / stalling in games" that totally fits your situation.

user15221: Pre-move 
h8Q 
Qh7 g5g6g7g8QQhf7Qxe6 Qgf7 Qee8++ 
and go to sleep. Then file a complaint in the morning.

user16057: I followed @itub's suggestion and filed a report against the particular user. Here's the answer I got from Chess.com support:

[...]
Certainly, this is not what we want on our site! I have sent this
  member to our investigative department for a close watch on this
  account. They will be monitored and if they continue this behavior, we
  will have to close their account!
Thank you so much for reporting! We appreciate it so much!!
[...]
Chess.com Member Support Staff

Since Chess.com also takes it seriously, I do suggest to report malicious users instead of not doing anything, so that in future they don't ruin online chess experience of your fellow mates as well.

user12523: The behavior you describe is bad sportsmanship and goes against the policies of chess.com. See the chess.com fair play policy and this blog post about the new abuse report system which includes an option specifically for "poor sportsmanship / stalling in games".

user14079: Assuming you also have plenty of time on your clock, make a break: have a drink, or check your mail, or pay a visit to the bathroom, or grab a book (even if it's an openings book, it doesn't count at cheating in that position ;) ), or go verify if your baby hasn't hurt herself with that knife she was trying to grab when you were too busy calculating your Bxh6! sacrifice to stop her. Meanwhile, check every five minutes that the opponent hasn't played (the worst trick would be if he plays a meaningless move at some point and ends up winning on time). After your well-deserved 20' pause, collect your point, block this undelicate opponent to make sure you never play against him anymore, and look for another partner. You will win the next game as well thanks to your fresh mind after the 20' break.
In case you're a real chess lover who doesn't care about his virtual Elo rating, and really just want to start a new game as soon as possible, the alternative is to resign yourself. I almost never do that because I do care about my little rating points (vanitas vanitatum, omnia vanitas) and because the pueril opponent might believe he has been smart when he gets gifted that pseudo-win, which might even encourage him to continue his misbehavour. But objectively, we shouldn't care at all what the abusing, unfair player is thinking - It's not our job to educate him, and we don't have the means to do it anyway.

16057: <p>One of my opponents at <a href="http://chess.com" rel="noreferrer">chess.com</a> just stopped moving after falling into objectively losing position, refused to resign, and made me wait for 20 minutes to claim a win by time.</p>

<p>I've recently resumed my online chess activity and I have experienced this childish behavior of some online chess players several times already.</p>

<p>Does chess.com's engine detect such unsportsmanlike behavior? Or is there a way to flag such users, so that they could be punished? What is the proper etiquette for us to proceed in such cases?</p>

<p>Here's the game position when my opponent stopped moving and refused to resign:</p>

<pre><code>[Title "Me vs Malicious Player"]
[FEN "8/7P/2k1p3/p3P3/Pp1K2P1/1P6/8/8 w - - 0 44"]
</code></pre>
 12873: <p>Unfortunately there isn't much you can do to make the game end immediately. If you care about your online rating and don't want to do something like offer a draw, you'll have to wait. I'd suggest doing something else that you need to do with that time.</p>

<p>After the game though, there is plenty you can do. The best course of action would be reporting the user to Chess.com, explaining how they made you wait 20 mins. For proof, you could take a screenshot of your game when your opponent has 15 minutes, and another screenshot when he runs out of time. This will show Chess.com it is the same position, and that your opponent just let the clock run down.</p>

<p>Additionally, you can block the user so that you never play them again. This will save you some time in the future, if you get paired again.</p>

<p>Here's Chess.com's link on how to deal with unfair players. They give instructions on how to report a player, as well as other things:</p>

<p><a href="https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know" rel="nofollow noreferrer">https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know</a></p>
 14079: <p>Time for an update: Chess.com has just <a href="https://www.chess.com/blog/News/new-tools-for-fair-play-on-chess-com" rel="nofollow noreferrer">released</a> a new formular for reporting abusing players.</p>

<p>It includes a category "poor sportsmanship / stalling in games" that totally fits your situation.</p>
 15221: <p>Pre-move </p>

<p>h8Q <br>
Qh7<br> g5<br>g6<br>g7<br>g8Q<br>Qhf7<br>Qxe6<br> Qgf7<br> Qee8++ <br></p>

<p>and go to sleep. Then file a complaint in the morning.</p>
 16057: <p>I followed <a href="https://chess.stackexchange.com/a/21240/16057">@itub</a>'s suggestion and <a href="https://support.chess.com/customer/portal/emails/new" rel="noreferrer">filed a report</a> against the particular user. Here's the answer I got from Chess.com support:</p>

<blockquote>
  <p>[...]</p>
  
  <p>Certainly, this is not what we want on our site! I have sent this
  member to our investigative department for a close watch on this
  account. They will be monitored and if they continue this behavior, we
  will have to close their account!</p>
  
  <p>Thank you so much for reporting! We appreciate it so much!!</p>
  
  <p>[...]</p>
  
  <p>Chess.com Member Support Staff</p>
</blockquote>

<p>Since Chess.com also takes it seriously, I do suggest to report malicious users instead of not doing anything, so that in future they don't ruin online chess experience of your fellow mates as well.</p>
 12523: <p>The behavior you describe is bad sportsmanship and goes against the policies of chess.com. See the <a href="https://support.chess.com/customer/en/portal/articles/1444922-fair-play-policy" rel="noreferrer">chess.com fair play policy</a> and this <a href="https://www.chess.com/blog/News/new-tools-for-fair-play-on-chess-com" rel="noreferrer">blog post about the new abuse report system</a> which includes an option specifically for "poor sportsmanship / stalling in games".</p>
 14079: <p>Assuming you also have plenty of time on your clock, <strong>make a break</strong>: have a drink, or check your mail, or pay a visit to the bathroom, or grab a book (even if it's an openings book, it doesn't count at cheating in that position ;) ), or go verify if your baby hasn't hurt herself with that knife she was trying to grab when you were too busy calculating your Bxh6! sacrifice to stop her. <br>Meanwhile, check every five minutes that the opponent hasn't played (the worst trick would be if he plays a meaningless move at some point and ends up winning on time). After your well-deserved 20' pause, collect your point, block this undelicate opponent to make sure you never play against him anymore, and look for another partner. You will win the next game as well thanks to your fresh mind after the 20' break.</p>

<p>In case you're a real chess lover who doesn't care about his virtual Elo rating, and really just want to start a new game as soon as possible, <strong>the alternative</strong> is to resign yourself. I almost never do that because I <em>do</em> care about my little rating points (<em>vanitas vanitatum, omnia vanitas</em>) and because the pueril opponent might believe he has been smart when he gets gifted that pseudo-win, which might even encourage him to continue his misbehavour. But objectively, we shouldn't care at all what the abusing, unfair player is thinking - It's not our job to educate him, and we don't have the means to do it anyway.</p>
