Answers.Body: <p>After playing around in <a href="https://lichess.org/analysis#0" rel="nofollow noreferrer">Lichess's analysis page,</a> I found a <strong>mate in 10.</strong> Throwing the moves into <a href="https://www.chess.com/analysis" rel="nofollow noreferrer">chess.com's analysis page</a> provides further confirmation. It has a few wholly unique lines, and some dualed ones, making it reminiscent of a chess problem per @Hauke Reddmann's above comment.</p>
  <pre><code>[FEN &quot;&quot;]
  [Title &quot;#10 After 3 Moves&quot;]
  
  1. e4 d5 2. h3 Kd7 3. Bb5+ Ke6 4. Qg4+ Kd6 5. e5+ Kc5 6. b4+ Kxb5 7. a4+ Kb6 8. a5+ Kc6 9. b5+ Kc5 10. Ba3+ Kxb5 11. Nc3+ Kc6 12. Qa4+ b5 13. Qxb5#
  </code></pre>
  <p>It can be done the other way around as well.</p>
  <pre><code>[Title &quot;#10 After 2.5 Moves&quot;]
  [FEN &quot;&quot;]
  
  1. d4 e5 2. Kd2 Bb4+ 3. Ke3 Qg5+ 4. Kd3 e4+ 5. Kc4 b5+ 6. Kxb4 a5+ 7. Kc3 b4+ 8. Kb3 a4+ 9. Kc4 Ba6+ 10. Kxb4 Nc6+ 11. Kc3 Qa5+ 12. b4 Qxb4#
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-29T22:00:35.593Z
Answers.Text: Well, in terms of finding "what is the theoretical perfect line of play for Black after `1. e4` we can strike `2...Kd7 3...Ke6` off that list.
Answers.UserDisplayName: BaseZen
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-30T10:28:15.743Z
Answers.Text: Impressive. (I tried out a few other setups on the queenside, but no luck.)
Answers.UserDisplayName: Hauke Reddmann
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-29T20:24:49.510Z
Answers.LastActivityDate: 2021-06-17T19:10:00.353Z
Answers.LastEditDate: 2021-06-17T19:10:00.353Z
Answers.UserDisplayName: Rewan Demontay
Body: <p>It is possible to reach (exactly) #8 after just 3 moves:</p>
  <pre><code>[Title &quot;#8 after 3 moves&quot;]
  [FEN &quot;&quot;]
  
  1. e3 f6 2. Qf3 Kf7 3. Nh3 Qe8! 4. Ng5+ Kg6 5. Bd3+ Kxg5 6. Qf4+ Kh5 7. g4+ Kh4 8. Qg3+ Kg5 9. f4+ Kh6 10. g5+ fxg5 11. Qxg5#
  </code></pre>
  <p>Is there any longer forced win than #8 that can be reached (and proven) after just 3 moves?</p>
  <p>This question is a <em>variant</em> of, and therefore not a duplicate, <a href="https://chess.stackexchange.com/questions/34876/the-quickest-mate-in-n">&quot;The quickest mate in n.&quot;</a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-29T19:58:42.690Z
Comments.Text: Just two minor comments: For a brute force attack, you have to check about 100 million positions (quickly googled that; with some intelligent guessing you surely can bring that down - 1.e~ is probably forced, and likewise 1...d/e/f~). Second, it would also be remarkable if the resulting position would be correct as a chess problem (e.g. here h4+ works as well as f4+).
Comments.UserDisplayName: Hauke Reddmann
Tags: <problems><checkmate><puzzles><records>
Title: Longest forced win after 3 moves
ThreadText: # Longest forced win after 3 moves
  
  (Asked by: username_0 on 2021-05-29)
  
  It is possible to reach (exactly) #8 after just 3 moves:
  
  ```
  [Title "#8 after 3 moves"]
  [FEN ""]
  
  1. e3 f6 2. Qf3 Kf7 3. Nh3 Qe8! 4. Ng5+ Kg6 5. Bd3+ Kxg5 6. Qf4+ Kh5 7. g4+ Kh4 8. Qg3+ Kg5 9. f4+ Kh6 10. g5+ fxg5 11. Qxg5#
  
  ```
  
  Is there any longer forced win than #8 that can be reached (and proven) after just 3 moves?
  
  This question is a *variant* of, and therefore not a duplicate, ["The quickest mate in n."](https://chess.stackexchange.com/questions/34876/the-quickest-mate-in-n)
  
  **Tags:** problems, checkmate, puzzles, records
  
  > **Comments:**
  > **username_1**: Just two minor comments: For a brute force attack, you have to check about 100 million positions (quickly googled that; with some intelligent guessing you surely can bring that down - 1.e~ is probably forced, and likewise 1...d/e/f~). Second, it would also be remarkable if the resulting position would be correct as a chess problem (e.g. here h4+ works as well as f4+).  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2021-05-29. Score: 5 | Accepted answer
  
  After playing around in [Lichess's analysis page,](https://lichess.org/analysis#0) I found a **mate in 10.** Throwing the moves into [chess.com's analysis page](https://www.chess.com/analysis) provides further confirmation. It has a few wholly unique lines, and some dualed ones, making it reminiscent of a chess problem per @username_1's above comment.
  
  ```
  [FEN ""]
  [Title "#10 After 3 Moves"]
  
  1. e4 d5 2. h3 Kd7 3. Bb5+ Ke6 4. Qg4+ Kd6 5. e5+ Kc5 6. b4+ Kxb5 7. a4+ Kb6 8. a5+ Kc6 9. b5+ Kc5 10. Ba3+ Kxb5 11. Nc3+ Kc6 12. Qa4+ b5 13. Qxb5#
  
  ```
  
  It can be done the other way around as well.
  
  ```
  [Title "#10 After 2.5 Moves"]
  [FEN ""]
  
  1. d4 e5 2. Kd2 Bb4+ 3. Ke3 Qg5+ 4. Kd3 e4+ 5. Kc4 b5+ 6. Kxb4 a5+ 7. Kc3 b4+ 8. Kb3 a4+ 9. Kc4 Ba6+ 10. Kxb4 Nc6+ 11. Kc3 Qa5+ 12. b4 Qxb4#
  
  ```
  
  > **Comments:**
  > **username_3**: Well, in terms of finding "what is the theoretical perfect line of play for Black after `1. e4` we can strike `2...Kd7 3...Ke6` off that list.  
  > **username_1**: Impressive. (I tried out a few other setups on the queenside, but no luck.)  
  
  ---
  
  