Philippine-born Grandmaster Wesley So stunned reigning world champion GM Magnus Carlsen of Norway with the black pieces in the fifth round to stay half-a-point behind GM Levon Aronian of Armenia in the 2020 Champions Showdown: Chess 9LX on Sunday.
So, who now represents the United States, now has 4 points following drawn matches with GM Maxime Vachier-Lagrave of France in the fourth round and world No. 2 Fabiano Caruana in the sixth.
So is the reigning champion of random chess, the same format being played in the online tournament.
Aronian scored three straight victories against GM Alireza Firouzja, Russian GM Peter Svidler and GM Leinier Dominguez Perez to lead the $150,000 tournament with 4.5 points.
Carlsen whipped Firouzja and drew with GM Hikaru Nakamura of the US to bring his total to 4 points.
Also with 4 points was Nakamura who trounced former world champion Garry Kasparov and Caruana.
Rounding out the standings were Dominguez Perez 3.5, Caruana 3, Kasparov 2, Svidler 2, Lagrave 1.5 and Firouzja 1.5.
The last three rounds will be played Monday.