Game 2 of their candidates match. Game 1 had been a draw, but Tal had the better of it.
In this game, Tal was surprised by the Caro-Kann Defense (Two Knights Attack [B10]). Portisch tried to play quietly and simplify the position, but the "magician from Riga" managed to conjure up an attack on Portisch's king, stuck in the center of the board.