That's a very popular and main line. Haven't seen how the 'opening book' works but can it be reached by one of the other move orders?
Chess.com-Book opening
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This might prove useful (if dated):
http://www.exeterchessclub.org.uk/ecocodes.html
It appears as if the difference between E57 and E58 doesn't occur until Black's eighth move.
Jul 2, 2010
0
#5
E58 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8. a3 Bc3 9. bc3
Jul 2, 2010
0
#6
I got this from here
| 877 | 5 | view | |
| E57 | Nimzo-Indian Defense: 4.e3, Main line with 8...dc and 9...cd 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 8.a3 dxc4 9.Bxc4 cxd4 |
Is your 'book opening' up to date ? Well why is that I am not seeing anything on ECO E58 here ?
got this from wikibooks.org
E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 c5 7. O-O Nc6 8. a3 Bxc3 9. bxc3