The Boston Globe Boston, Massachusetts Sunday, July 31, 1966 - Page 63
The Piatigorsky chess tournament has begun in Santa Monica and will certainly be ranked as one of the strongest tournaments ever held in the annals of chess.
The participants are Petrosian and Spassky of the Soviet Union, Bobby Fischer and Samuel Reshevsky, United States; Jan Donner, Netherlands; L. Portisch, Hungary; M. Najdorf, Argentina; B. Ivkov, Yugoslavia; Bent Larsen, Denmark, and Wolfgang Unzicker, West Germany.
The tourney will be an 18-round, round-robin.
In early rounds, Portisch upset Petrosian and Fischer is tied for first with three players.