Just learned of this news. Probably one of my favorite players from the 1970’s. RIP
Respectfully Submitted, David A. Cole, USCF Life Member, Franklin, NJ
I’ve moved this topic from US Chess Issues to All Things Chess.
Kavalek annotated this amazing game for Chess Life:
https://www.chessgames.com/perl/chessgame?gid=1113690
He played his immortal game as a teenager:
https://www.chessgames.com/perl/chessgame?gid=1261710
I just looked at Wikipedia—the article selected the same two games 
& reminds us that the Montréal 1979 supertournament would not have happened without Kavalek as organizer. And it was Kavalek, not Lombardy, who analyzed the adjourned position in the famous game 13 of Fischer-Spassky with Bobby.
Very sympathetic person & an excellent writer (check out his many Chess Life articles in the 1970s archives).