Lajos Portisch contributed a plus score for his side, but he incurred the wrath of Fischer when, in the last round, he inadvertently conceded a draw to Korchnoi by threefold repetition in a won position . (See Threefold repetition#Portisch versus Korchnoi, 1970). The game was regarded by many as crucial in determining the final match result, since the match would have been tied if Portisch had won the game. The Rest of the World team were also hindered by Samuel Reshevsky being unable to play his final round game against Smyslov because it fell on the Jewish Sabbath. His replacement, Fridrik Olafsson, was defeated.