Answers.Body: <p>To escape from perpetual check when up material in an endgame, a good strategy is to try to surround your King with your extra pieces. In this case, that would be your Queen and Rook, and maybe a few of your pawns. Sample line:</p>
  
  <p>1...Kb8 2. Qd6+ Ka7 3. Qc7+ Rb7 4. Qc5+ Kb8  and now White has a few options:</p>
  
  <p>a) 5. Qd6+ Kc8 6. Qc6+ Rc7 (7. Qe8+ Kb7) 7. Qa8+ Kd7 and Black escapes.</p>
  
  <p>b) 5. Qf8+ Kc7 6. Qe7+ (6. Qd6+ Kc8 transposes to line a) Kb6 7. Qd6+ Kb5!! 8. a4+ Ka5 9. Qc5+ Rb5!!  and Black wins. White cannot take Rb5 with the a-pawn due to the threat of Qh1#</p>
  
  <p>I found all the moves myself up until move 7 in line b). Komodo came up with the brilliant idea of 7...Kb5, 8...Ka5, and 9...Rb5</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-26T09:19:38.050Z
Answers.Text: +1. I don't need to correct my answer anymore since you show the right variation.
Answers.UserDisplayName: Evargalo
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-26T09:30:19.370Z
Answers.Text: @Evargalo From a practical standpoint, I think your answer still has merit. If White doesn't find 5. a4+, then the game is won quicker. If White does find the move, Black is still winning but it will take a while to prove. Objectively 2...Kb7 isn't best, but in a situation such as time trouble over the board it's perfectly valid.
Answers.UserDisplayName: Inertial Ignorance
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-25T20:43:38.430Z
Answers.LastActivityDate: 2018-04-25T20:43:38.430Z
Answers.UserDisplayName: Inertial Ignorance
Answers.Body: <p>It seems that the black king can escape via a5/</p>
  
  <pre><code>[FEN "2k5/7p/p1Q3p1/3pP3/1r2qP2/1P4PK/P7/8 b - - 0 1"]
  
  1...Kb8 2.Qd6+ Kb7 3.Qd7+ Kb6 4.Qd8+ Kb5 5.Qb8+ Ka5 {Kc5? 6. Qd6 Kd4?? 7.Qxb4} 6.Qc7+ Rb6 7.Qc5+ Rb5 8.Qc7+ Kb4 {and you go for the hills.}
  </code></pre>
  
  <p><em>edit:</em> 5.a4+!, noticed by @jknappen, is problematic. The right solution is rather to bring the king to a7 before covering checks with ...Rb7, as in @InertialIgnorance 's answer which should become the accepted one.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-25T13:25:20.863Z
Answers.Text: and what happens after 5. a4+ guarding the field b5  with the pawn? Will black win with a rook sacrifice?
Answers.UserDisplayName: Sir Cornflakes
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-25T13:56:17.567Z
Answers.Text: @jknappen : uuum, good remark. Giving back the rook is, to say the least, too complicated for the final position of a CT exercise. I've to spend more time on the position tonight, maybe Kb6-a7 and bringing down the rook to b6/b7 is rather the way to go.
Answers.UserDisplayName: Evargalo
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-25T20:47:05.980Z
Answers.Text: @jknappen As Evargalo said, Black needs to move the King back down. Komodo says Black is still winning after 5...Kc6, but there's a lot of work to do.
Answers.UserDisplayName: Inertial Ignorance
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-25T21:25:20.593Z
Answers.Text: @jknappen The mate threat of ...Qh1+ and Qh5# is looming, so if Black plays Rb5 he can escape to b4.
Answers.UserDisplayName: Jossie Calderon
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-04-25T09:44:58.513Z
Answers.LastActivityDate: 2020-06-12T19:06:40.673Z
Answers.LastEditDate: 2020-06-12T19:06:40.673Z
Answers.UserDisplayName: Evargalo
Body: <p>In this position, what is a clear line in which Black escapes from perpetual check?</p>
  
  <pre><code>[FEN "2k5/7p/p1Q3p1/3pP3/1r2qP2/1P4PK/P7/8 b - - 0 1"]
  </code></pre>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-04-24T16:04:21.673Z
Comments.Text: I only see lines where black "escapes" from perpetual check by running into a helpmate (e.g., on h8 or on h5). Needless to say, that perpetual check is the better choice for black.
Comments.UserDisplayName: Sir Cornflakes
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-04-25T04:36:23.193Z
Comments.Text: @jknappen this is a CT solution to a puzzle.
Comments.UserDisplayName: Jossie Calderon
Tags: <analysis><strategy><draw><check>
Title: How does Black escape perpetual check here?
ThreadText: # How does Black escape perpetual check here?
  
  (Asked by: username_0 on 2018-04-24)
  
  In this position, what is a clear line in which Black escapes from perpetual check?
  
  ```
  [FEN "2k5/7p/p1Q3p1/3pP3/1r2qP2/1P4PK/P7/8 b - - 0 1"]
  
  ```
  
  **Tags:** analysis, strategy, draw, check
  
  > **Comments:**
  > **username_1**: I only see lines where black "escapes" from perpetual check by running into a helpmate (e.g., on h8 or on h5). Needless to say, that perpetual check is the better choice for black.  
  > **username_0**: @jknappen this is a CT solution to a puzzle.  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_3 on 2018-04-25. Score: 7 | Accepted answer
  
  It seems that the black king can escape via a5/
  
  ```
  [FEN "2k5/7p/p1Q3p1/3pP3/1r2qP2/1P4PK/P7/8 b - - 0 1"]
  
  1...Kb8 2.Qd6+ Kb7 3.Qd7+ Kb6 4.Qd8+ Kb5 5.Qb8+ Ka5 {Kc5? 6. Qd6 Kd4?? 7.Qxb4} 6.Qc7+ Rb6 7.Qc5+ Rb5 8.Qc7+ Kb4 {and you go for the hills.}
  
  ```
  
  *edit:* 5.a4+!, noticed by @jknappen, is problematic. The right solution is rather to bring the king to a7 before covering checks with ...Rb7, as in @username_2 's answer which should become the accepted one.
  
  > **Comments:**
  > **username_1**: and what happens after 5. a4+ guarding the field b5  with the pawn? Will black win with a rook sacrifice?  
  > **username_3**: @jknappen : uuum, good remark. Giving back the rook is, to say the least, too complicated for the final position of a CT exercise. I've to spend more time on the position tonight, maybe Kb6-a7 and bringing down the rook to b6/b7 is rather the way to go.  
  > **username_2**: @jknappen As username_3 said, Black needs to move the King back down. Komodo says Black is still winning after 5...Kc6, but there's a lot of work to do.  
  > **username_0**: @jknappen The mate threat of ...Qh1+ and Qh5# is looming, so if Black plays Rb5 he can escape to b4.  
  
  ---
  
  ### Answer by username_2 on 2018-04-25. Score: 7
  
  To escape from perpetual check when up material in an endgame, a good strategy is to try to surround your King with your extra pieces. In this case, that would be your Queen and Rook, and maybe a few of your pawns. Sample line:
  
  1...Kb8 2. Qd6+ Ka7 3. Qc7+ Rb7 4. Qc5+ Kb8 and now White has a few options:
  
  a) 5. Qd6+ Kc8 6. Qc6+ Rc7 (7. Qe8+ Kb7) 7. Qa8+ Kd7 and Black escapes.
  
  b) 5. Qf8+ Kc7 6. Qe7+ (6. Qd6+ Kc8 transposes to line a) Kb6 7. Qd6+ Kb5!! 8. a4+ Ka5 9. Qc5+ Rb5!! and Black wins. White cannot take Rb5 with the a-pawn due to the threat of Qh1#
  
  I found all the moves myself up until move 7 in line b). Komodo came up with the brilliant idea of 7...Kb5, 8...Ka5, and 9...Rb5
  
  > **Comments:**
  > **username_3**: +1. I don't need to correct my answer anymore since you show the right variation.  
  > **username_2**: @username_3 From a practical standpoint, I think your answer still has merit. If White doesn't find 5. a4+, then the game is won quicker. If White does find the move, Black is still winning but it will take a while to prove. Objectively 2...Kb7 isn't best, but in a situation such as time trouble over the board it's perfectly valid.  
  
  ---
  
  