Body: <p>Is there any possibility to check, without the use of the tablebases, if a position in the endgame queen+pawn vs queen (KQPKQ) allows a perpetual check for the weaker side?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T09:20:22.093Z
Comments.Text: Do you mean a draw or why is perpetual check significant for you?
Comments.UserDisplayName: JiK
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T14:15:19.470Z
Comments.Text: No, I mean a perpetual check. This might be easier to determine.
Comments.UserDisplayName: Peter
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T14:17:40.340Z
Comments.Text: What does having a perpetual check mean? If the weaker side has the opportunity to exchange queens, it won't? If the stronger side has the opportunity to force a win or a queen exchange, it does not count as a perpetual check?
Comments.UserDisplayName: JiK
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T14:20:14.847Z
Comments.Text: A perpetual check does not involve captures. It simply means that the king of the stronger side cannot hide from the checks of the opponent's queen.
Comments.UserDisplayName: Peter
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T14:37:58.597Z
Comments.Text: So for example the position White king g1 rook h2, Black king h8 queen f8 is not a perpetual check for White?
Comments.UserDisplayName: JiK
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-14T15:46:09.227Z
Comments.Text: Yes, by calculation ...
Comments.UserDisplayName: BlindKungFuMaster
Tags: <learning><endgame><tablebases><queen-endgame>
Title: Is there any method to determine if the weaker side in KQPKQ has a perpetual check?
ThreadText: # Is there any method to determine if the weaker side in KQPKQ has a perpetual check?
  
  (Asked by: username_0 on 2015-03-14)
  
  Is there any possibility to check, without the use of the tablebases, if a position in the endgame queen+pawn vs queen (KQPKQ) allows a perpetual check for the weaker side?
  
  **Tags:** learning, endgame, tablebases, queen-endgame
  
  > **Comments:**
  > **username_1**: Do you mean a draw or why is perpetual check significant for you?  
  > **username_0**: No, I mean a perpetual check. This might be easier to determine.  
  > **username_1**: What does having a perpetual check mean? If the weaker side has the opportunity to exchange queens, it won't? If the stronger side has the opportunity to force a win or a queen exchange, it does not count as a perpetual check?  
  > **username_0**: A perpetual check does not involve captures. It simply means that the king of the stronger side cannot hide from the checks of the opponent's queen.  
  > **username_1**: So for example the position White king g1 rook h2, Black king h8 queen f8 is not a perpetual check for White?  
  > **username_2**: Yes, by calculation ...  
  
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  ## 0 answers
  
  