user8751: 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?

user7189: 
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).


user8860: 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!?


8751: <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>
 7189: <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>
 8860: <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>
