Answers.Body: <p>The tags seem to give a big hint . . .</p>
  
  <blockquote class="spoiler">
    <p> 1 Rg7+! Kxg7 (Kh8 can't be better, since White can at least repeat with 2 Rh7+ Kg8 3 Rg7+)
   2 Qd7+ Rf1-f7 (Rf8-f7 3 Qxg4+ and perpetual check since White has access also to c8; K-moves get mated: Kf6? 3 Qe6+ and 4 Qg6, or Kh6/g8/h8? 3 Qh7+)
   3 Qxg4+ Kh8 4 Qxh4+ Kg8 and White can either take the perpetual starting 5 Qg4+ (checks from h3/g4/e6/c8) or go for more with 5 Rf1!?</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-04T04:07:05.840Z
Answers.LastActivityDate: 2015-12-04T04:07:05.840Z
Answers.UserDisplayName: Noam D. Elkies
Answers.Body: <blockquote class="spoiler">
    <p><code>1. Rg7+!!</code>
   if <code>1 .. Kh8 2. Rh7+ Kg8 3. Rg7+  etc</code>
  if <code>1 .. Kxg7 2. Qd7+</code> followed by perpetual check from the white queen on the white squares (<code>e6</code> &amp; <code>g4</code>).</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-12-04T08:45:06.203Z
Answers.LastActivityDate: 2015-12-04T08:56:15.463Z
Answers.LastEditDate: 2015-12-04T08:56:15.463Z
Answers.UserDisplayName: Matt D. Webb
Body: <p>The British Knockout championship is taking place now as a warm-up to the London Chess Classic that starts this Friday. There have been very interesting games (especially the ones played by Nicholas Pert) like this one between Jonathan Rowson and Gawain Jones.</p>
  
  <pre><code>[fen "5rk1/4R3/1pQp4/3Pp3/4B1pp/4q1P1/PP3rPK/3R4 w - - 0 1"]
  </code></pre>
  
  <p>Gawain had a huge advantage but has just played ...h4 letting it slip away. Rowson has one chance to avoid losing the game. <strong>What should he play?</strong></p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-12-04T04:00:50.323Z
Comments.Text: Rg7+ follows by never ending check with the White's queen?
Comments.UserDisplayName: SmallChess
Tags: <tactics><problems><check><perpetual>
Title: Chess challenge #8: British knockout championship
ThreadText: # Chess challenge #8: British knockout championship
  
  (Asked by: username_0 on 2015-12-04)
  
  The British Knockout championship is taking place now as a warm-up to the London Chess Classic that starts this Friday. There have been very interesting games (especially the ones played by Nicholas Pert) like this one between Jonathan Rowson and Gawain Jones.
  
  ```
  [fen "5rk1/4R3/1pQp4/3Pp3/4B1pp/4q1P1/PP3rPK/3R4 w - - 0 1"]
  
  ```
  
  Gawain had a huge advantage but has just played ...h4 letting it slip away. Rowson has one chance to avoid losing the game. **What should he play?**
  
  **Tags:** tactics, problems, check, perpetual
  
  > **Comments:**
  > **username_1**: Rg7+ follows by never ending check with the White's queen?  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2015-12-04. Score: 6 | Accepted answer
  
  The tags seem to give a big hint . . .
  
  > 1 Rg7+! Kxg7 (Kh8 can't be better, since White can at least repeat with 2 Rh7+ Kg8 3 Rg7+)
  > 2 Qd7+ Rf1-f7 (Rf8-f7 3 Qxg4+ and perpetual check since White has access also to c8; K-moves get mated: Kf6? 3 Qe6+ and 4 Qg6, or Kh6/g8/h8? 3 Qh7+)
  > 3 Qxg4+ Kh8 4 Qxh4+ Kg8 and White can either take the perpetual starting 5 Qg4+ (checks from h3/g4/e6/c8) or go for more with 5 Rf1!?
  
  
  ---
  
  ### Answer by username_3 on 2015-12-04. Score: 4
  
  > `1. Rg7+!!`
  > if `1 .. Kh8 2. Rh7+ Kg8 3. Rg7+ etc`
  > if `1 .. Kxg7 2. Qd7+` followed by perpetual check from the white queen on the white squares (`e6` & `g4`).
  
  
  ---
  
  