1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. g1f3  3... g8f6  4. e2e3  4... g7g6 This variation is named after Carl Schlechter, a player who almost became the world champion and drew the most mysterious match in chess history, against Emanuel Lasker in 1910. 5. b1c3  5... f8g7  6. f1e2  6... e8g8  7. e1g1 Black has many choices in this position. 7... c8e6  8. b2b3 White can also fight for the advantage with other moves. 8... f6e4  9. c1b2  9... b8d7  10. a1c1  10... d7f6 [%c_effect f6;square;f6;type;Inaccuracy;persistent;true] 11. c3a4 [%c_effect a4;square;a4;type;GreatFind;persistent;true] A new and excellent move. White prepares Ne5 followed by f2-f3, expelling the knight and keeping pieces on the board, something useful for the side with a space advantage. 11... a8c8  12. f3e5  12... f6d7  13. e5d3 The knight is ready to go to f4. 13... e6f5 [%c_effect f5;square;f5;type;Inaccuracy;persistent;true] 14. g2g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] 14... f5e6  15. d3f4 Everything has gone wrong with Black's opening. But in a rapid game, unexpected chances can occur, as we shall see. 15... g7h6  16. f2f3  16... e4f6  17. h2h4 [%c_effect h4;square;h4;type;Mistake;persistent;true] A mistake that puts Black back into the game. 17... h6f4  18. e3f4 The problem with 17.h4 is that after ...h7-h5, it's not easy to support White's pawn structure, a problem that would easily be solved with a pawn on h3. Black should try to exploit this. 18... d5c4  19. b3c4  19... b7b5 [%c_effect b5;square;b5;type;Mistake;persistent;true] After this mistake, White gets a big advantage again. 20. d4d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] This move was certainly missed by Abdusattorov. His idea would work well after 20.cxb5. 20... c6d5  21. c4b5 White now has a huge positional advantage. The dark-squared bishop is too strong, and the pawns are dangerous on both flanks. 21... c8c1  22. d1c1 