Chess Opening Theory/1. d4/1...Nf6/2. c4/2...d6

=Old Indian Defence=

2...d6
This is the so-called "Old Indian," and it can either transpose into a KID or follow less popular lines with a strategy similar to the KID, such as the Tartakower-Indian.

Theory table
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'''1. d4 Nf6 2. c4 d6'''