Answers.Body: <p>Answer:</p>
  <blockquote class="spoiler">
  <p> Black's side.</p>
  </blockquote>
  <p>Reasoning:</p>
  <blockquote class="spoiler">
  <p> For convenience I'll just use white coordinates. If no capture was made last move, the rook cannot come from the f-file, and the black king was the only black piece on the board. Where did the black king come from previously? Not from g1/g2 (next to the white king), not from e2 (impossible double check from both rooks), and not from e1 (impossible double check from e3 rook + c2 knight).</p>
  </blockquote>
  <blockquote class="spoiler">
  <p> So the black king must have come from &quot;f2&quot;, and the double check from the rook + knight is settled with an unpromotion. Board is from black's perspective; retract -1. Re7 Kc7 -2. dxe8=N and the position unlocks.</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-12-24T01:22:31.420Z
Answers.LastActivityDate: 2020-12-24T01:22:31.420Z
Answers.UserDisplayName: Remellion
Body: <pre><code>[FEN &quot;8/8/8/8/8/4R3/2N2R2/3N1k1K w - - 0 1&quot;]
  </code></pre>
  <p>Given that this position could be reached in a legal game of chess, and that no piece was captured on the last move, are we seeing the board from White's or Black's side?</p>
  
Tags: <problems><retrograde-analysis>
Title: Coordinates probem
ThreadText: # Coordinates probem
  
  (Asked by: username_0 on 2020-12-23)
  
  ```
  [FEN "8/8/8/8/8/4R3/2N2R2/3N1k1K w - - 0 1"]
  
  ```
  
  Given that this position could be reached in a legal game of chess, and that no piece was captured on the last move, are we seeing the board from White's or Black's side?
  
  **Tags:** problems, retrograde-analysis
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2020-12-24. Score: 2
  
  Answer:
  
  > Black's side.
  
  Reasoning:
  
  > For convenience I'll just use white coordinates. If no capture was made last move, the rook cannot come from the f-file, and the black king was the only black piece on the board. Where did the black king come from previously? Not from g1/g2 (next to the white king), not from e2 (impossible double check from both rooks), and not from e1 (impossible double check from e3 rook + c2 knight).
  
  > So the black king must have come from "f2", and the double check from the rook + knight is settled with an unpromotion. Board is from black's perspective; retract -1. Re7 Kc7 -2. dxe8=N and the position unlocks.
  
  
  ---
  
  