When I study the games of Top players ,I discovered a bad move ( move no. 38- Nxc3)) of Black (Mr. M.carelsen ) against white (V. Ivanchuk) in 2009 , the link https://www.365chess.com/view_game.php?g=3689283.
I think the best move is Ra5, Black will win in place of draw, analyze:
1) If white plays 39- Rxa5 , Black ( Carlsen) has Nf2+ ( checkmate)
2) If white plays 39- Nf5 , Black ( Carlsen) has Nf2+ , 40- Rxf2 …. Rxa1+ ,41- Rf1…..Rxf1+ ( checkmate).
3) If white plays 39- h3, Black ( Carlsen) has Nf2+, 40- Kh2… Pxe3+,41- Nf4……Bxf4 + ( checkmate).
If white plays 39- Rg1, Black ( Carlsen) has Rxg1+, 40- Kxg1, Rxa2 and white lose by difference in pieces.