Answers.Body: <p>There are indeed a couple of transpositions from the Nimzo-Indian to the Panov variation of the Caro-Kann and they occur sometimes in practical games.</p>
  
  <p>Using a database of chess games, they can be filtered by searching simultaneously on:</p>
  
  <ol>
  <li>The position after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4</li>
  <li>"B10-B19", i.e. the ECO-code of the Caro-Kann.</li>
  </ol>
  
  <p>After finding the games where an actual transposition occured, they can be put in a tree-like structure to count the transpositions.</p>
  
  <p>Using ChessBase Mega Database 2015, 91 games are found, for which both players have a FIDE rating of 2200 or more. Then, the found games were put in a ChessBase tree-file (.ctg).</p>
  
  <p>The most common transpositions found this way are: </p>
  
  <ol>
  <li>4.e3 0-0 5.Bd3 c5 6.Nf3 d5 7.0-0 cxd4 8.exd4</li>
  <li>4.e3 0-0 5.Bd3 d5 6.Nf3 c5 (see 1)</li>
  <li>4.e3 c5 5.Nf3 0-0 6.Bd3 (see 1)</li>
  <li>4.e3 c5 5.Bd3 0-0 (see 1)</li>
  </ol>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-06-14T04:00:29.337Z
Answers.Text: In your first line, 5. Nf3 is played only 9.6% of the time and 5...cxd4 is played only 2.3% of the time. In your second line, 6...cxd4 is played only 2.6% of the time. So the two lines that you give are definitely not "the most common transpositions".
Answers.UserDisplayName: Fate
Answers.ContentLicense: CC BY-SA 3.0
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Answers.Text: Indeed, 5.Nf3 is not the most common move. However, the statistics you mention aren't necessarily relevant, as they apply on all the games and not on the games where there is a transposition. Anyway, my answer is incomplete and incorrect, so I will edit it. Furthermore, I would like to add that any statistics will strongly depend on the used database.
Answers.UserDisplayName: Maxwell86
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Answers.CreationDate: 2015-06-13T18:09:15.450Z
Answers.LastActivityDate: 2015-06-14T08:53:21.543Z
Answers.LastEditDate: 2015-06-14T08:53:21.543Z
Answers.UserDisplayName: Maxwell86
Body: <p>I would like to know what are all the most frequent transpositions between the two following openings:</p>
  
  <p>.</p>
  
  <p>The Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4:</p>
  
  <pre><code>  [StartPly "12"]
  
    [FEN ""]
    1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4
  </code></pre>
  
  <p>.</p>
  
  <p>The Nimzo-Indian Defence:</p>
  
  <pre><code>  [StartPly "6"]
  
    [FEN ""]
    1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
  </code></pre>
  
  <p>.</p>
  
  <p>Please try if possible to provide the list of all the transpositions sorted from the most common to the rarest.</p>
  
  <p>.</p>
  
  <p>Edit: I found two transpositions which seem to be very common ones.</p>
  
  <p>Both of these two lines:</p>
  
  <ul>
  <li><ol>
  <li>d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O cxd4 8. exd4 dxc4 9. Bxc4</li>
  </ol></li>
  <li><ol>
  <li>d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 cxd4 9. exd4 </li>
  </ol></li>
  </ul>
  
  <p>Transpose into this line:</p>
  
  <ul>
  <li><ol>
  <li>e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4 7. Bd3 dxc4 8. Bxc4 O-O 9. O-O</li>
  </ol></li>
  </ul>
  
  <p>But there are maybe more transpositions.</p>
  
Tags: <opening><theory><caro-kann><transpositions><nimzo-indian>
Title: What are all the most common transpositions between the Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4 and the Nimzo-Indian Defence?
ThreadText: # What are all the most common transpositions between the Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4 and the Nimzo-Indian Defence?
  
  (Asked by: username_0 on 2015-06-12)
  
  I would like to know what are all the most frequent transpositions between the two following openings:
  .
  The Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4:
    [StartPly "12"]
  
    [FEN ""]
    1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4
  
  .
  The Nimzo-Indian Defence:
    [StartPly "6"]
  
    [FEN ""]
    1. d4 Nf6 2. c4 e6 3. Nc3 Bb4
  
  .
  Please try if possible to provide the list of all the transpositions sorted from the most common to the rarest.
  .
  Edit: I found two transpositions which seem to be very common ones.
  Both of these two lines:
  
  
  d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O cxd4 8. exd4 dxc4 9. Bxc4
  
  
  d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 cxd4 9. exd4 
  
  
  Transpose into this line:
  
  
  e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4 7. Bd3 dxc4 8. Bxc4 O-O 9. O-O
  
  
  But there are maybe more transpositions.
  
  **Tags:** opening, theory, caro-kann, transpositions, nimzo-indian
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2015-06-13. Score: 2
  
  There are indeed a couple of transpositions from the Nimzo-Indian to the Panov variation of the Caro-Kann and they occur sometimes in practical games.
  
  Using a database of chess games, they can be filtered by searching simultaneously on:
  
  1. The position after 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
  2. "B10-B19", i.e. the ECO-code of the Caro-Kann.
  
  After finding the games where an actual transposition occured, they can be put in a tree-like structure to count the transpositions.
  
  Using ChessBase Mega Database 2015, 91 games are found, for which both players have a FIDE rating of 2200 or more. Then, the found games were put in a ChessBase tree-file (.ctg).
  
  The most common transpositions found this way are:
  
  1. 4.e3 0-0 5.Bd3 c5 6.Nf3 d5 7.0-0 cxd4 8.exd4
  2. 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 (see 1)
  3. 4.e3 c5 5.Nf3 0-0 6.Bd3 (see 1)
  4. 4.e3 c5 5.Bd3 0-0 (see 1)
  
  > **Comments:**
  > **username_0**: In your first line, 5. Nf3 is played only 9.6% of the time and 5...cxd4 is played only 2.3% of the time. In your second line, 6...cxd4 is played only 2.6% of the time. So the two lines that you give are definitely not "the most common transpositions".  
  > **username_1**: Indeed, 5.Nf3 is not the most common move. However, the statistics you mention aren't necessarily relevant, as they apply on all the games and not on the games where there is a transposition. Anyway, my answer is incomplete and incorrect, so I will edit it. Furthermore, I would like to add that any statistics will strongly depend on the used database.  
  
  ---
  
  