In July 2002 Stripunsky participated in the World Open tournament. He became 15th with 6 points.
In December 2004 he shared first place at the US Championship. He scored 7 points out of 9 rounds, together with Hikaru Nakamura. At December 6 the play-offs were won by Hikaru Nakamura, Stripunsky therefore became runner-up.
In 2014 Stripunski won the Fairfield County Masters & Class Championships, which were held in Fairfield County, Connecticut; the average rating of the players in the top section was 2430.[2] He won the tournament by in the last round defeating his main competitor IM Jan Van de Mortel in 33 moves.
In 2015 he reached shared third place at the annual New Jersey Open tournament, scoring 4.5 points in 6 games. The tournament was won by GM Magesh Panchanathan.[3]