Answers.Body: <p>From the OP and the discussion in comments I guess you're looking for more nuanced variations. Here's one that comes to mind from the Queen's pawn game (symmetric-pseudo-Catalan), where if black doesn't break the symmetry at some point, white will either be up a pawn or have tangible positional advantage. </p>
  
  <pre><code> [title "Queen's pawn game example"]
   [fen ""]
  
   1. d4 d5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. O-O O-O 6. b3 b6 7. Bb2 Bb7 8. Nbd2 Nbd7 9. c4 c5 10. e3 e6 11. Ne5 Ne4 12. Nxe4 {Here black can no longer keep playing symmetrically, as exemplified in the shown mainline. Instead black has to simply recapture on e4 and it's a normal game.} Nxe5 (12...dxe4 {optimal continuation for black here, breaking the symmetry.} 13. Nxd7 Qxd7 14. Qc2) 13. dxe5 dxe4 14. Qc2 Rb8 (14...Qc7 15. Bxe4 {and white is up a clear pawn}) 15. Rad1 Qc7 16. Bxe4 Bxe5 17. Bxe5 Qxe5 18. Bxb7 Rxb7 {despite the symmetric pawn structure and equal material, white has a clear positional advantage as they control the only open file and black's disconnected rooks are far from being in time to challenge the file.}
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-07-23T15:20:25.470Z
Answers.Text: This is one possible example I was looking for. Maybe it is even too deep as a position :D   If there is such an example where this happens some moves before please do share that as I would like to know! Thank you anyway!
Answers.UserDisplayName: Ric S
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-07-22T15:58:45.507Z
Answers.LastActivityDate: 2019-07-22T15:58:45.507Z
Answers.UserDisplayName: user929304
Body: <p>I know that symmetrical variations of some openings are good up to a certain point, after which White gets a significant advantage (like gaining a piece or even mating the opponent's king). One such example is the match below, following the Italian variation of the Four Knights Game (C50):</p>
  
  <pre><code>[Event "?"]
  [Site "?"]
  [Date "?"]
  [Eventdate "?"]
  [Round "?"]
  [Result "1-0"]
  [White "NN"]
  [Black "NN"]
  [ECO "C50"]
  [WhiteElo "?"]
  [BlackElo "?"]
  [Plycount "27"]
  [FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
  
  1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bc4 Bc5 5.O-O O-O 6.d3 d6 7.Bg5 Bg4 8.Nd5 Nd4 9.Qd2 Qd7 10.Bxf6 Bxf3 11.Ne7+ Kh8 12.Bxg7+ Kxg7 13.Qg5+ Kh8 14.Qf6#
  1-0
  </code></pre>
  
  <p>After the move <code>9. ..Qd7</code>, White gains a significant advantage in which Black will have to sacrifice some pieces (even the queen in one line) or he is getting checkmated.</p>
  
  <p>My question is: do you know any other example of situations like this, where White gets a significant advantage after a few moves performed in a symmetrical fashion?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-07-22T13:13:44.167Z
Comments.Text: This question seems to allow a lot of trivial answers like 1.e4 e5 2.Qg4 Qg5?! 3.Qxg5. What kind of answer are you looking for?
Comments.UserDisplayName: RemcoGerlich
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-07-22T13:24:30.220Z
Comments.Text: You're right, I didn't think about examples like this. I do not want to take into consideration "stupid" moves by Black such as giving the queen or a piece for nothing. I want to consider (at least almost) standard openings, from move 3/4 to move 9/10. For instance, in my example `9. ..Qd7` might seem a "natural" move for an inexperienced player, he just missed a tactic in the upcoming five moves. I hope my answer is clear.
Comments.UserDisplayName: Ric S
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-07-23T15:17:57.697Z
Comments.Text: @RewanDemontay That's not exactly true because Black could play `4. ..Qe7` and all is fine for Black, he broke the symmetry for no reason.
Comments.UserDisplayName: Ric S
Tags: <opening><opening-traps>
Title: Bad symmetrical variations
ThreadText: # Bad symmetrical variations
  
  (Asked by: username_0 on 2019-07-22)
  
  I know that symmetrical variations of some openings are good up to a certain point, after which White gets a significant advantage (like gaining a piece or even mating the opponent's king). One such example is the match below, following the Italian variation of the Four Knights Game (C50):
  
  ```
  [Event "?"]
  [Site "?"]
  [Date "?"]
  [Eventdate "?"]
  [Round "?"]
  [Result "1-0"]
  [White "NN"]
  [Black "NN"]
  [ECO "C50"]
  [WhiteElo "?"]
  [BlackElo "?"]
  [Plycount "27"]
  [FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
  
  1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bc4 Bc5 5.O-O O-O 6.d3 d6 7.Bg5 Bg4 8.Nd5 Nd4 9.Qd2 Qd7 10.Bxf6 Bxf3 11.Ne7+ Kh8 12.Bxg7+ Kxg7 13.Qg5+ Kh8 14.Qf6#
  1-0
  
  ```
  
  After the move `9. ..Qd7`, White gains a significant advantage in which Black will have to sacrifice some pieces (even the queen in one line) or he is getting checkmated.
  
  My question is: do you know any other example of situations like this, where White gets a significant advantage after a few moves performed in a symmetrical fashion?
  
  **Tags:** opening, opening-traps
  
  > **Comments:**
  > **username_1**: This question seems to allow a lot of trivial answers like 1.e4 e5 2.Qg4 Qg5?! 3.Qxg5. What kind of answer are you looking for?  
  > **username_0**: You're right, I didn't think about examples like this. I do not want to take into consideration "stupid" moves by Black such as giving the queen or a piece for nothing. I want to consider (at least almost) standard openings, from move 3/4 to move 9/10. For instance, in my example `9. ..Qd7` might seem a "natural" move for an inexperienced player, he just missed a tactic in the upcoming five moves. I hope my answer is clear.  
  > **username_0**: @RewanDemontay That's not exactly true because Black could play `4. ..Qe7` and all is fine for Black, he broke the symmetry for no reason.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2019-07-22. Score: 2
  
  From the OP and the discussion in comments I guess you're looking for more nuanced variations. Here's one that comes to mind from the Queen's pawn game (symmetric-pseudo-Catalan), where if black doesn't break the symmetry at some point, white will either be up a pawn or have tangible positional advantage.
  
  ```
   [title "Queen's pawn game example"]
   [fen ""]
  
   1. d4 d5 2. Nf3 Nf6 3. g3 g6 4. Bg2 Bg7 5. O-O O-O 6. b3 b6 7. Bb2 Bb7 8. Nbd2 Nbd7 9. c4 c5 10. e3 e6 11. Ne5 Ne4 12. Nxe4 {Here black can no longer keep playing symmetrically, as exemplified in the shown mainline. Instead black has to simply recapture on e4 and it's a normal game.} Nxe5 (12...dxe4 {optimal continuation for black here, breaking the symmetry.} 13. Nxd7 Qxd7 14. Qc2) 13. dxe5 dxe4 14. Qc2 Rb8 (14...Qc7 15. Bxe4 {and white is up a clear pawn}) 15. Rad1 Qc7 16. Bxe4 Bxe5 17. Bxe5 Qxe5 18. Bxb7 Rxb7 {despite the symmetric pawn structure and equal material, white has a clear positional advantage as they control the only open file and black's disconnected rooks are far from being in time to challenge the file.}
  
  ```
  
  > **Comments:**
  > **username_0**: This is one possible example I was looking for. Maybe it is even too deep as a position :D   If there is such an example where this happens some moves before please do share that as I would like to know! Thank you anyway!  
  
  ---
  
  