|Vietnamese super grandmaster Le Quang Liem (Photo: St Louis Chess)
After enjoying the advantage of holding the white pawn, Liem, Elo rating 2694, was able to beat his strong American opponent Jeffery, Elo rating 2684, in just 27 moves.
In their previous meeting, the Vietnamese player had been defeated by Xiong Jeffery after 42 moves.
The positive result leaves Liem on four points after seven matches, putting him among the leading group alongside David Howell of the UK, Elo rating 2692.
In second place with 3.5 points is Sam Shankland of the US, Gawain Jones of the UK, and Xiong of the US.
Dariusz Swiercz remains bottom with 2.5 points.