Daniel Fernandez vs Willem Hajenius
29th World Open Philadelphia, PA USA round 5 2001.07.06
English Opening: Anglo-Indian Defense, Grünfeld Formation 1-0

Dan E Mayers vs Willem Hajenius
29th World Open Philadelphia, PA USA round 2 2001.07.05
Bird Opening: Dutch Variation, Batavo Gambit 1/2-1/2

Willem Hajenius vs Kenneth T Solomon
29th World Open Philadelphia, PA USA round 1 2001.07.04
Nimzo-Indian Defense: Leningrad Variation 0-1