Answers.Body: <p>On Lichess, inaccuracies are denoted <code>?!</code>, mistakes by <code>?</code> and blunders by <code>??</code>. You can click on the `x inaccuracies/x mistakes/ x blunders' to move between these.</p>
  
  <p>The move was inaccurate since it reduced a forced mate from 16 moves (Kc3) to 13 moves. Lichess marks inaccuracies for large checkmate sequences, since humans aren't expected to find these.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-21T23:13:36.397Z
Answers.LastActivityDate: 2020-01-21T23:13:36.397Z
Answers.UserDisplayName: SolvingProblems
Answers.Body: <p>There is no valid human reason. The difference between Kc4 (mate in 12), and Kc2 (mate in 10) is fairly irrelevant. It simply appended the "?!" based on the algorithm that 10 is slightly worse than 12. Either way, it is, indeed, a simple win from there.</p>
  
  <p>By the way, my plan would be Rd7, then bring the king to h1/g1, and only then, bring the rook over via the f-file to take on h2. The longer you can keep the white king out, the less you have to calculate.</p>
  
  <p>In general though, if the situation were different, and the material were more even, you might not want to box your king into the smaller area.</p>
  
  <pre><code> [FEN "1B6/8/8/8/4k1p1/2Kr3p/7P/8 w - - 0 0"]
  
   1. Kc2 (1.Kc4)
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-21T11:44:04.190Z
Answers.Text: Usually, I observed that Lichess does not mark a move as "?!" unless it is significantly worse, and it does not distinguish between "mate in 12" and "mate in 10". In the case I linked, it evaluates `Kc2` as #-14 and `Kc4` as #-22. Maybe that's why.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-21T11:45:41.550Z
Answers.Text: I'll accept your answer in a few days if nobody gives any other reason for this unusual annotation.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-21T11:34:17.080Z
Answers.LastActivityDate: 2020-01-21T11:39:31.437Z
Answers.LastEditDate: 2020-01-21T11:39:31.437Z
Answers.UserDisplayName: PhishMaster
Body: <p>I was looking at <a href="https://lichess.org/czhdj87l/black#129" rel="nofollow noreferrer">this game on Lichess</a>, where it says "Checkmate is now unavoidable. Best move was Kc4." As far as I can tell, checkmate was already unavoidable, including after <code>Kc4</code>. Namely, Black can move <code>Ke3,Ke2,Rf3,Kf1,Kg2,g3</code> and then either <code>gxh2</code> or <code>Rxg3</code> according to White's next move, leading to a won end-game. Am I missing something?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-21T16:57:57.277Z
Comments.Text: I cannot check LI since they forked their interface and declared that  chrome is not supported so I need to get chrome.  Don't they explain their symbol usage somewhere?
Comments.UserDisplayName: edwina oliver
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-21T16:59:45.927Z
Comments.Text: @edwinaoliver: Not that I am aware of.
Comments.UserDisplayName: user21820
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-21T17:03:27.730Z
Comments.Text: Might want to try to ask in their forum andor email the owners of the site.
Comments.UserDisplayName: edwina oliver
Tags: <endgame><checkmate><pawn-promotion>
Title: Why does Lichess mark this move as "?!"?
ThreadText: # Why does Lichess mark this move as "?!"?
  
  (Asked by: username_0 on 2020-01-21)
  
  I was looking at [this game on Lichess](https://lichess.org/czhdj87l/black#129), where it says "Checkmate is now unavoidable. Best move was Kc4." As far as I can tell, checkmate was already unavoidable, including after `Kc4`. Namely, Black can move `Ke3,Ke2,Rf3,Kf1,Kg2,g3` and then either `gxh2` or `Rxg3` according to White's next move, leading to a won end-game. Am I missing something?
  
  **Tags:** endgame, checkmate, pawn-promotion
  
  > **Comments:**
  > **username_1**: I cannot check LI since they forked their interface and declared that  chrome is not supported so I need to get chrome.  Don't they explain their symbol usage somewhere?  
  > **username_0**: @username_1: Not that I am aware of.  
  > **username_1**: Might want to try to ask in their forum andor email the owners of the site.  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_3 on 2020-01-21. Score: 7 | Accepted answer
  
  There is no valid human reason. The difference between Kc4 (mate in 12), and Kc2 (mate in 10) is fairly irrelevant. It simply appended the "?!" based on the algorithm that 10 is slightly worse than 12. Either way, it is, indeed, a simple win from there.
  
  By the way, my plan would be Rd7, then bring the king to h1/g1, and only then, bring the rook over via the f-file to take on h2. The longer you can keep the white king out, the less you have to calculate.
  
  In general though, if the situation were different, and the material were more even, you might not want to box your king into the smaller area.
  
  ```
   [FEN "1B6/8/8/8/4k1p1/2Kr3p/7P/8 w - - 0 0"]
  
   1. Kc2 (1.Kc4)
  
  ```
  
  > **Comments:**
  > **username_0**: Usually, I observed that Lichess does not mark a move as "?!" unless it is significantly worse, and it does not distinguish between "mate in 12" and "mate in 10". In the case I linked, it evaluates `Kc2` as #-14 and `Kc4` as #-22. Maybe that's why.  
  > **username_0**: I'll accept your answer in a few days if nobody gives any other reason for this unusual annotation.  
  
  ---
  
  ### Answer by username_2 on 2020-01-21. Score: 2
  
  On Lichess, inaccuracies are denoted `?!`, mistakes by `?` and blunders by `??`. You can click on the `x inaccuracies/x mistakes/ x blunders' to move between these.
  
  The move was inaccurate since it reduced a forced mate from 16 moves (Kc3) to 13 moves. Lichess marks inaccuracies for large checkmate sequences, since humans aren't expected to find these.
  
  
  ---
  
  