5

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:

    1. 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
    1. 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:

    1. 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.

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)
  • 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". – Fate Jun 14 '15 at 4:00
  • 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. – Maxwell86 Jun 14 '15 at 8:25

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