1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g2g3  3... g8f6  4. f1g2  4... f8e7  5. g1f3  5... e8g8  6. e1g1  6... d5c4 One of the oldest and most solid lines against the Catalan. 7. d1c2  7... a7a6 The main move. 8. a2a4  8... b8c6 Also a modern idea. 9. b1a3 This move, played after a prolonged thought, is obviously an over-the-board novelty. Unfortunately for Mammadzada, the combination of the moves Qd1-c2 and Nb1-a3 does not work well. 9... b7b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] Zatonskih had spent almost an hour on the clock but found the best continuation. Or rather, refutation $1 The pawn cannot be regained now. 10. f3e5 