Answers.Body: <p>Yes this seems to be a drawn endgame, most variations actually end up in a queen vs queen+knight situation which is generally a drawn endgame (one example below). But that doesn't mean the puzzle is <em>flawed</em> because as far as I know chesstempo puzzles are just about finding the <em>best moves</em> a priori, thus not always about a winning line. Good tactics trainers (such as chesstempo, lichess...) usually only say which side is to move, and the objective of the puzzle is actually part of the puzzle itself (that is, whether one is to play to mate, play to win material, or play to draw etc.) </p>
  
  <p>In this particular position black has to come up with the best moves in order to hold the game it seems.</p>
  
  <pre><code> [title "One possible continuation, 1/2-1/2"]
   [fen "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 0 1"]
  
   1. Kf5 g4 2. fxg4 Nxe4 3. Ke5 Kd3 4. Kd5 Ng5 5. Kc6 Kc3 6. Kxb6 Kb4 7. Kc6 Nf7 8. Kb6 Ng5 9. Kc6 Kxb3 10. Kxc5 Kxa4 11. Kd6 Kb4 12. c5 Ne4+ 13. Ke5 Nxc5 14. g5 a4 15. g6 a3 16. g7 a2 17. g8=Q a1=Q+ 18. Kf5 Qf1+ 19. Kg6 Qg2+ 20. Kh7
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T02:36:32.787Z
Answers.Text: The puzzle is flawed then, because any other move would also create a draw.
Answers.UserDisplayName: ericw31415
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T03:16:07.010Z
Answers.Text: 1. Kf5 Nxe4 2. fxe4 g4 3. e5 g3 4. e6 g2 5. e7 g1=Q 6. e8=Q+ 1/2-1/2
Answers.UserDisplayName: ericw31415
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T19:04:07.370Z
Answers.Text: @ericw31415 just because there's another drawing line it doesn't mean it's a flawed puzzle. It's always about the most accurate (optimal) variation. I'm sure you've seen lots of checkmate puzzles where for example there are a ton of other checkmates but that are longer (or any other winning variation) than the accepted/best variation, and they don't mean the puzzle is flawed.
Answers.UserDisplayName: Ellie
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T20:00:33.350Z
Answers.Text: But say you put a drawn position into a tablebase. It'll just give you a random drawing move. You can't "draw faster".
Answers.UserDisplayName: ericw31415
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T21:09:06.387Z
Answers.Text: There are no 10-piece endgame tablebases to my knowledge, so I don't what you've looked up. The starting position of the puzzle is what matters.
Answers.UserDisplayName: Ellie
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-10T21:12:58.627Z
Answers.Text: The line I gave is as drawn.
Answers.UserDisplayName: ericw31415
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-13T00:20:48.627Z
Answers.Text: I think this answer is wrong, because it does not take the rules of ChessTempo into account. See my answer below.
Answers.UserDisplayName: LeibnizGW
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-07T02:37:25.533Z
Answers.LastActivityDate: 2018-02-07T02:37:25.533Z
Answers.UserDisplayName: Ellie
Answers.Body: <p>I agree that this game seems to be a draw. And this fact DOES make the puzzle flawed, according to the rules of ChessTempo.</p>
  
  <p>The rules of problems depend on the website. On some websites, the problem simply requires to find the best move. In those cases, the best move can be a winning move, or it can be a move that draws or equalizes an apparently lost position. </p>
  
  <p>But on ChessTempo, the rules are different, the player is required to find a move that wins, and this is defined as giving a won endgame, or an advantage of at least two pawns. </p>
  
  <p>So, if this position is really drawn (as it seems), then this puzzle is wrong, and should be reported to the administrators of the site.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-13T00:19:14.297Z
Answers.LastActivityDate: 2018-02-13T00:19:14.297Z
Answers.UserDisplayName: LeibnizGW
Body: <p>While solving puzzles on ChessTempo, I came across this puzzle:</p>
  
  <pre><code>[FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5
  </code></pre>
  
  <p>I played the intended correct answer,</p>
  
  <pre><code>[FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5 g4 2. fxg4 Nxe4
  </code></pre>
  
  <p>My question now, is this final position drawn, thus invalidating the puzzle?</p>
  
  <p>I tried some lines but they all seemed to draw. Example:</p>
  
  <pre><code>[FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5 g4 2. fxg4 Nxe4 3. Ke5 Kd3 4. Kd5 Nf6+
  5. Kc6 Kc2 6. Kxb6 Kxb3 7. g5 Ne4 8. Kxa5 Kxc4 {Tablebase draw} 1/2-1/2
  </code></pre>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-03-01T12:00:04.370Z
Comments.Text: @user929304 Was inactive for a period of time
Comments.UserDisplayName: ericw31415
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-03-01T12:29:12.603Z
Comments.Text: ah okay :(, hope all is well.
Comments.UserDisplayName: user929304
Tags: <endgame><tactics>
Title: Is this tactics puzzle flawed?
ThreadText: # Is this tactics puzzle flawed?
  
  (Asked by: username_0 on 2018-02-07)
  
  While solving puzzles on ChessTempo, I came across this puzzle:
  
  ```
  [FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5
  
  ```
  
  I played the intended correct answer,
  
  ```
  [FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5 g4 2. fxg4 Nxe4
  
  ```
  
  My question now, is this final position drawn, thus invalidating the puzzle?
  
  I tried some lines but they all seemed to draw. Example:
  
  ```
  [FEN "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 9 1"]
  
  1. Kf5 g4 2. fxg4 Nxe4 3. Ke5 Kd3 4. Kd5 Nf6+
  5. Kc6 Kc2 6. Kxb6 Kxb3 7. g5 Ne4 8. Kxa5 Kxc4 {Tablebase draw} 1/2-1/2
  
  ```
  
  **Tags:** endgame, tactics
  
  > **Comments:**
  > **username_0**: @username_1 Was inactive for a period of time  
  > **username_1**: ah okay :(, hope all is well.  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2018-02-07. Score: 5 | Accepted answer
  
  Yes this seems to be a drawn endgame, most variations actually end up in a queen vs queen+knight situation which is generally a drawn endgame (one example below). But that doesn't mean the puzzle is *flawed* because as far as I know chesstempo puzzles are just about finding the *best moves* a priori, thus not always about a winning line. Good tactics trainers (such as chesstempo, lichess...) usually only say which side is to move, and the objective of the puzzle is actually part of the puzzle itself (that is, whether one is to play to mate, play to win material, or play to draw etc.)
  
  In this particular position black has to come up with the best moves in order to hold the game it seems.
  
  ```
   [title "One possible continuation, 1/2-1/2"]
   [fen "8/8/1p6/p1p3p1/P1P1B1K1/1P2kP2/5n2/8 w - - 0 1"]
  
   1. Kf5 g4 2. fxg4 Nxe4 3. Ke5 Kd3 4. Kd5 Ng5 5. Kc6 Kc3 6. Kxb6 Kb4 7. Kc6 Nf7 8. Kb6 Ng5 9. Kc6 Kxb3 10. Kxc5 Kxa4 11. Kd6 Kb4 12. c5 Ne4+ 13. Ke5 Nxc5 14. g5 a4 15. g6 a3 16. g7 a2 17. g8=Q a1=Q+ 18. Kf5 Qf1+ 19. Kg6 Qg2+ 20. Kh7
  
  ```
  
  > **Comments:**
  > **username_0**: The puzzle is flawed then, because any other move would also create a draw.  
  > **username_0**: 1. Kf5 Nxe4 2. fxe4 g4 3. e5 g3 4. e6 g2 5. e7 g1=Q 6. e8=Q+ 1/2-1/2  
  > **username_2**: @username_0 just because there's another drawing line it doesn't mean it's a flawed puzzle. It's always about the most accurate (optimal) variation. I'm sure you've seen lots of checkmate puzzles where for example there are a ton of other checkmates but that are longer (or any other winning variation) than the accepted/best variation, and they don't mean the puzzle is flawed.  
  > **username_0**: But say you put a drawn position into a tablebase. It'll just give you a random drawing move. You can't "draw faster".  
  > **username_2**: There are no 10-piece endgame tablebases to my knowledge, so I don't what you've looked up. The starting position of the puzzle is what matters.  
  > **username_0**: The line I gave is as drawn.  
  > **username_3**: I think this answer is wrong, because it does not take the rules of ChessTempo into account. See my answer below.  
  
  ---
  
  ### Answer by username_3 on 2018-02-13. Score: 3
  
  I agree that this game seems to be a draw. And this fact DOES make the puzzle flawed, according to the rules of ChessTempo.
  
  The rules of problems depend on the website. On some websites, the problem simply requires to find the best move. In those cases, the best move can be a winning move, or it can be a move that draws or equalizes an apparently lost position.
  
  But on ChessTempo, the rules are different, the player is required to find a move that wins, and this is defined as giving a won endgame, or an advantage of at least two pawns.
  
  So, if this position is really drawn (as it seems), then this puzzle is wrong, and should be reported to the administrators of the site.
  
  
  ---
  
  