[%c_effect e2;square;e2;type;Interesting;persistent;true] The development of the knight on e2 in this line is somewhat surprising.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. c1d2 A fashionable variation in the Nimzo-Indian. You can check my analysis of Nakamura-Praggnanandhaa from the same tournament. 5... b7b6  6. f1d3  6... c8b7 