[%c_effect h6;square;h6;type;GreatFind;persistent;true] A good prophylactic move to prevent an attack from White's bishop on g5.
1. d2d4  1... d7d5  2. c2c4  2... d5c4  3. e2e3  3... g8f6  4. f1c4  4... e7e6  5. g1f3  5... a7a6  6. e1g1  6... c7c5  7. c4e2 [%c_effect e2;square;e2;type;Interesting;persistent;true] Only the tenth most popular choice in this Queen's Gambit Accepted position, which shows how rich it is. White has the most diverse options, such as 7.a4, which was played by Botvinnik in the match against Petrosian, and the solid 7.dxc5, which was played by Kramnik in the match against Kasparov (he also played 7.a4 in one of the games), or the more ambitious 7.Bb3, which I played several times, among other moves. 7... b8d7  8. b1c3  8... b7b5 The position ended up transposing into a known line, with a lot of theory, which sometimes occurs in a different order of moves. 9. d4d5 A critical attempt. 9... e6d5  10. c3d5  10... c8b7  11. d5f6  11... d8f6 [%c_effect f6;square;f6;type;GreatFind;persistent;true] 12. a2a4  12... b5b4  13. e3e4 All of this is still well-known.