[%c_effect e3;square;e3;type;GreatFind;persistent;true] A very difficult move to make; after all, exchanging this dark-squared bishop is a pain in the chest. Now we have a nice fight between a pair of bishops and a pair of knights. The capture is necessary for the black knights to start jumping.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. d2d4  3... c5d4  4. f3d4  4... e7e5 A risky variation that shows that Nakamura was willing to play for the win with Black. This choice certainly surprised his opponent, who was probably expecting the Berlin. 5. d4b5  5... d7d6  6. b1c3  6... a7a6  7. b5a3  7... c8e6  8. a3c4  8... a8b8 This mysterious move is a specialty of GM Maghsoodloo. I won't pretend to understand the idea. Let's say it's a kind of super protection to play b7-b5 at some point. 9. c3d5  9... e6d5  10. e4d5  10... c6e7  11. g2g3  11... b7b5  12. c4e3  12... g7g6  13. a2a4  13... g8f6  14. a4b5  14... a6b5  15. f1g2  15... f8h6  16. e1g1  16... e8g8  17. d1d3  17... f6d7 With the knight going to c5 and the pawns on the kingside ready to roll, Black has a fine position. 18. c1d2  18... d7c5  19. d3e2  19... d8c7  20. b2b4 A natural move, but placing the bishop on this square is also interesting. 20... c5d7  21. a1a5 