Answers.Body: <blockquote>
  <p>so maybe putting a knight on d5 can deflect it away</p>
  </blockquote>
  <p>Putting a knight on d5 will close the h1-a8 diagonal after a capture on d5 and therefore gives the chance to counterattack for white. Haven't analyzed but from intuitive POV black might even lose the knight after something like <code>1. ... N6d5 2. Nxd5 Nxd5 3. Be4</code></p>
  <blockquote>
  <p>So why is Rh8 the correct move?</p>
  </blockquote>
  <p>Notice the <strong>a8</strong> Queen pins the <strong>g2</strong> pawn and therefore <strong>Rxh3</strong> is a threat. Also White queen doesn't have any good squares apart from <strong>e1</strong> and <strong>f2</strong> to defend the <strong>e3</strong> Knight to the threat of <strong>Rxh3</strong> -&gt; <strong>Rxe3</strong></p>
  <blockquote>
  <p>My thought process is that the white knight is the only thing preventing Qg2#,</p>
  </blockquote>
  <p>This is exactly the idea behind Rh8 as well. say after Qf2 comes Rxh3, then in the next move comes Rxe3 removing the g2 defending Knight. White queen can't recapture rook since g2 will be unprotected then. This sequence will leave black with an extra piece and with then threats of Re2.</p>
  
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Answers.UserDisplayName: cmgchess
Answers.Body: <p>1...Rh8 2. Q-wherever Rxh3+ is winning for Black. The pawn on g2 is pinned and cannot recapture, but after 3.Kg1, Black plays 3...Rxe3 removing the defender of g2 and threatening Qxg2#. White either recaptures and is mated, or is down a decisive amount of material.</p>
  
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Answers.UserDisplayName: Allure
Body: <p><a href="https://www.chess.com/puzzles/problem/1000668" rel="nofollow noreferrer">https://www.chess.com/puzzles/problem/1000668</a></p>
  <p>(Also if anyone knows how to start the PGN player with a black move, please let me know)</p>
  <pre><code>[Event &quot;Juan Martinez Sola Open A&quot;]
  [Site &quot;Almeria ESP&quot;]
  [Date &quot;2015.12.18&quot;]
  [Round &quot;2.1&quot;]
  [White &quot;Arboledas Fernandez,A&quot;]
  [Black &quot;Del Rio de Angelis,S&quot;]
  [FEN &quot;q3r3/5k2/p4n2/2p1p3/1p3n1Q/1P2N2P/2B3P1/3R3K b - - 1 1&quot;]
  
  1. ... Rh8
  </code></pre>
  <p>My thought process is that the white knight is the only thing preventing Qg2#, so maybe putting a knight on d5 can deflect it away.</p>
  <p>The solution of the puzzle for black is Rh8. This puts a threat on the white queen but it can just move away. The engine recommends either 2. Be4 Qxe4 and trade off pieces or 2. Bh7 to sacrifice the bishop, but I don't understand why Black has to trade. So why is Rh8 the correct move?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-08-21T00:28:44.470Z
Comments.Text: What is Black's best move after 1.. Rh8 2. Qf2 (or Qe1 or Qg3 or Qg5 - it's irrelevant)?
Comments.UserDisplayName: Alexander Woo
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-08-21T00:33:32.183Z
Comments.Text: @AlexanderWoo Rxh3+ which is losing by force
Comments.UserDisplayName: qwr
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-08-21T00:39:56.357Z
Comments.Text: Who is losing by force?
Comments.UserDisplayName: Alexander Woo
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-08-21T02:58:48.670Z
Comments.Text: @NilsLindemann I think you're right because of the pinned g2 pawn. Can you write an answer?
Comments.UserDisplayName: qwr
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-08-22T13:09:49.087Z
Comments.Text: Obvious tip for obvious beginner: If a move looks strange, play it on the board and try to calculate *at least* a move pair further. You surely then had had noticed the pin of Bg2 (and even further than that, the destruction-of-defender Rxe3).
Comments.UserDisplayName: Hauke Reddmann
Tags: <puzzles>
Title: What is the idea of this rook move in this puzzle?
ThreadText: # What is the idea of this rook move in this puzzle?
  
  (Asked by: username_0 on 2022-08-21)
  
  <https://www.chess.com/puzzles/problem/1000668>
  
  (Also if anyone knows how to start the PGN player with a black move, please let me know)
  
  ```
  [Event "Juan Martinez Sola Open A"]
  [Site "Almeria ESP"]
  [Date "2015.12.18"]
  [Round "2.1"]
  [White "Arboledas Fernandez,A"]
  [Black "Del Rio de Angelis,S"]
  [FEN "q3r3/5k2/p4n2/2p1p3/1p3n1Q/1P2N2P/2B3P1/3R3K b - - 1 1"]
  
  1. ... Rh8
  
  ```
  
  My thought process is that the white knight is the only thing preventing Qg2#, so maybe putting a knight on d5 can deflect it away.
  
  The solution of the puzzle for black is Rh8. This puts a threat on the white queen but it can just move away. The engine recommends either 2. Be4 Qxe4 and trade off pieces or 2. Bh7 to sacrifice the bishop, but I don't understand why Black has to trade. So why is Rh8 the correct move?
  
  **Tags:** puzzles
  
  > **Comments:**
  > **username_1**: What is Black's best move after 1.. Rh8 2. Qf2 (or Qe1 or Qg3 or Qg5 - it's irrelevant)?  
  > **username_0**: @username_1 Rxh3+ which is losing by force  
  > **username_1**: Who is losing by force?  
  > **username_0**: @NilsLindemann I think you're right because of the pinned g2 pawn. Can you write an answer?  
  > **username_2**: Obvious tip for obvious beginner: If a move looks strange, play it on the board and try to calculate *at least* a move pair further. You surely then had had noticed the pin of Bg2 (and even further than that, the destruction-of-defender Rxe3).  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_3 on 2022-08-21. Score: 0 | Accepted answer
  
  > so maybe putting a knight on d5 can deflect it away
  
  Putting a knight on d5 will close the h1-a8 diagonal after a capture on d5 and therefore gives the chance to counterattack for white. Haven't analyzed but from intuitive POV black might even lose the knight after something like `1. ... N6d5 2. Nxd5 Nxd5 3. Be4`
  
  > So why is Rh8 the correct move?
  
  Notice the **a8** Queen pins the **g2** pawn and therefore **Rxh3** is a threat. Also White queen doesn't have any good squares apart from **e1** and **f2** to defend the **e3** Knight to the threat of **Rxh3** -> **Rxe3**
  
  > My thought process is that the white knight is the only thing preventing Qg2#,
  
  This is exactly the idea behind Rh8 as well. say after Qf2 comes Rxh3, then in the next move comes Rxe3 removing the g2 defending Knight. White queen can't recapture rook since g2 will be unprotected then. This sequence will leave black with an extra piece and with then threats of Re2.
  
  
  ---
  
  ### Answer by username_4 on 2022-08-21. Score: 0
  
  1...Rh8 2. Q-wherever Rxh3+ is winning for Black. The pawn on g2 is pinned and cannot recapture, but after 3.Kg1, Black plays 3...Rxe3 removing the defender of g2 and threatening Qxg2#. White either recaptures and is mated, or is down a decisive amount of material.
  
  
  ---
  
  