Answers.Body: <p>There are a range of factors sites use;</p>
  <p>Such as play style, move depth , skill level vs move skill level. Engines are emotionless and are willing to just commit.</p>
  <p>Things such as ;</p>
  <ul>
  <li>Move depth not comparable to skill level</li>
  <li>Move Time being consistent eg 5 seconds per move (hard to demonstrate her)</li>
  <li>Consistent string of flawless games</li>
  </ul>
  <p><strong>Move depth not comparable to skill level</strong></p>
  <p>I have the following of a game played recently in an club vs club tournament on Lichess. This juniors game was detected as having cheating in it. Whilst it was being played people were suspicious by the two particular moves highlight below.</p>
  <p>This highlighted moves are something you would expect to see of players rated 2000+ and isn't a natural move to find especially for juniors. The human brain sees the rook move and discards it almost immediately as a Rook trading for a Bishop. I have reviewed the games since and found that the move list was 1 for 1 the entire time for black against StockFish 10</p>
  <pre><code>[White &quot;White &quot;]
  [Black &quot;The Suspect&quot;]
  [Event &quot;Hyper Aggressive Sacrifices (Blitz 3|2)&quot;]
  [FEN &quot;2krr3/ppp2ppp/2n3b1/4n3/2P3P1/P3PN1P/1P1NB3/2KR1R2 b - - 0 18&quot;]
  [StartFlipped &quot;0&quot;]
  
  1... Rd3! 2. Bxd3 Nxd3+ 3. Kc2 Nf2+ 4. Kc1 Nxd1 5. Kxd1
  </code></pre>
  <p>Another Example from the same game;</p>
  <pre><code>[White &quot;White&quot;]
  [Black &quot;The Suspect&quot;]
  [Result &quot;0-1&quot;]
  [FEN &quot;2kr4/ppp2ppp/6b1/8/2P1P1P1/P3rB1P/1PKN1n2/3R4 w - - 0 24&quot;]
  
  1. Rf1 Rxf3! 2. Nxf3 Bxe4+ 3. Kc3 Rd3+ 3. Kb4 Rxf3 3. Re1 Nd3+ 0-1
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-11-18T01:46:09.057Z
Answers.LastActivityDate: 2020-11-19T10:50:47.640Z
Answers.LastEditDate: 2020-11-19T10:50:47.640Z
Answers.UserDisplayName: Dheebs
Body: <p>Sometimes I feel that a human, particularly a human of about my elo rating, would not ever play so.</p>
  <p>I never used an engine in my life for cheating, but I think it is not so hard.</p>
  <p>I think, most of the cheaters does not automatize &quot;well&quot;. Thus, he has no way to step with the engine on the spot, instead if he switches to it, he needs to duplicate the state. This gets some time - maybe a minute - for him. After that, he starts to play astonishingly well.</p>
  <p>If I experience this pattern, I report it, but there is a bitter feeling. Obviously reporting someone beause I lost is no good. I think I should do this only if I am sure, but I can never be sure.</p>
  <p>There are rumors that chess.com has some very sophisticated technology to detect engine cheaters, but I doubt that they could really do it. I believe that they do their maximum (like utilizing some AI to measure the &quot;human-ness&quot; of the steps of the players), but I think anything what they could do, can be easily gamed (like using the engine only for some, critical steps of the party).</p>
  <p>Do maybe some other patterns exist, which could raise the doubt?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-18T00:42:16.300Z
Comments.Text: (I am about 1100 on the chess.com, playing nearly exclusively 10 min games)
Comments.UserDisplayName: Gray Sheep
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-18T01:01:24.373Z
Comments.Text: Losing as a 1100 player doesn't mean your opponent used a chess engine. Lot's of people can win against 1100 without an engine.
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-18T01:05:44.653Z
Comments.Text: @SmallChess Yes. About 50% of the people I am playing with. And - maybe in 10% of them - I have some doubt.
Comments.UserDisplayName: Gray Sheep
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-18T01:08:19.067Z
Comments.Text: Don't worry if your opponents were using engine or not. Improve your own games. Remove your blunders. As a 1100 level, I'm sure I can convincingly win without any engine help. So do many other players. Worry about it when you gain like 1000 rating points.
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-18T01:11:02.987Z
Comments.Text: @SmallChess chess.com user stat shows that about half of their users are below my rating.
Comments.UserDisplayName: Gray Sheep
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-01-13T18:31:27.130Z
Comments.Text: Perhaps the reason that people start playing better after a long pause is that they took some time to think about the position, and have had the time to come up with some new ideas about how they should play the position. In general, faster moves are less accurate, so it should not be a surprise that in complex positions, people will pause to think them over and start playing better having given the issue at hand some thought.
Comments.UserDisplayName: Noah
Tags: <engines><online-chess><cheating>
Title: What are the most characteristic signatures if an opponent cheats in online game by using an engine?
ThreadText: # What are the most characteristic signatures if an opponent cheats in online game by using an engine?
  
  (Asked by: username_0 on 2020-11-18)
  
  Sometimes I feel that a human, particularly a human of about my elo rating, would not ever play so.
  
  I never used an engine in my life for cheating, but I think it is not so hard.
  
  I think, most of the cheaters does not automatize "well". Thus, he has no way to step with the engine on the spot, instead if he switches to it, he needs to duplicate the state. This gets some time - maybe a minute - for him. After that, he starts to play astonishingly well.
  
  If I experience this pattern, I report it, but there is a bitter feeling. Obviously reporting someone beause I lost is no good. I think I should do this only if I am sure, but I can never be sure.
  
  There are rumors that chess.com has some very sophisticated technology to detect engine cheaters, but I doubt that they could really do it. I believe that they do their maximum (like utilizing some AI to measure the "human-ness" of the steps of the players), but I think anything what they could do, can be easily gamed (like using the engine only for some, critical steps of the party).
  
  Do maybe some other patterns exist, which could raise the doubt?
  
  **Tags:** engines, online-chess, cheating
  
  > **Comments:**
  > **username_0**: (I am about 1100 on the chess.com, playing nearly exclusively 10 min games)  
  > **username_1**: Losing as a 1100 player doesn't mean your opponent used a chess engine. Lot's of people can win against 1100 without an engine.  
  > **username_0**: @username_1 Yes. About 50% of the people I am playing with. And - maybe in 10% of them - I have some doubt.  
  > **username_1**: Don't worry if your opponents were using engine or not. Improve your own games. Remove your blunders. As a 1100 level, I'm sure I can convincingly win without any engine help. So do many other players. Worry about it when you gain like 1000 rating points.  
  > **username_0**: @username_1 chess.com user stat shows that about half of their users are below my rating.  
  > **username_2**: Perhaps the reason that people start playing better after a long pause is that they took some time to think about the position, and have had the time to come up with some new ideas about how they should play the position. In general, faster moves are less accurate, so it should not be a surprise that in complex positions, people will pause to think them over and start playing better having given the issue at hand some thought.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2020-11-18. Score: 4 | Accepted answer
  
  There are a range of factors sites use;
  Such as play style, move depth , skill level vs move skill level. Engines are emotionless and are willing to just commit.
  Things such as ;
  
  Move depth not comparable to skill level
  Move Time being consistent eg 5 seconds per move (hard to demonstrate her)
  Consistent string of flawless games
  
  Move depth not comparable to skill level
  I have the following of a game played recently in an club vs club tournament on Lichess. This juniors game was detected as having cheating in it. Whilst it was being played people were suspicious by the two particular moves highlight below.
  This highlighted moves are something you would expect to see of players rated 2000+ and isn't a natural move to find especially for juniors. The human brain sees the rook move and discards it almost immediately as a Rook trading for a Bishop. I have reviewed the games since and found that the move list was 1 for 1 the entire time for black against StockFish 10
  [White "White "]
  [Black "The Suspect"]
  [Event "Hyper Aggressive Sacrifices (Blitz 3|2)"]
  [FEN "2krr3/ppp2ppp/2n3b1/4n3/2P3P1/P3PN1P/1P1NB3/2KR1R2 b - - 0 18"]
  [StartFlipped "0"]
  
  1... Rd3! 2. Bxd3 Nxd3+ 3. Kc2 Nf2+ 4. Kc1 Nxd1 5. Kxd1
  
  Another Example from the same game;
  [White "White"]
  [Black "The Suspect"]
  [Result "0-1"]
  [FEN "2kr4/ppp2ppp/6b1/8/2P1P1P1/P3rB1P/1PKN1n2/3R4 w - - 0 24"]
  
  1. Rf1 Rxf3! 2. Nxf3 Bxe4+ 3. Kc3 Rd3+ 3. Kb4 Rxf3 3. Re1 Nd3+ 0-1
  
  
  ---
  
  