The 1967 Interzonal Tournament was played in Sousse, Tunisia in October and November. The first six placegetters qualified for the Candidates, along with Boris Spassky and Mikhail Tal who were seeded into the Candidates matches as finalists of the previous tournament.

A major controversy occurred when Bobby Fischer, who was leading the tournament with seven wins and three draws in ten rounds, abandoned the event over a dispute with the organisers. Because Fischer withdrew before he had played half his games, the results of his games were not included in his opponents' totals.

Bent Larsen went on to win, with Korchnoi, Geller, Gligorić, and Portisch taking the next four places.

There was a three-way tie for sixth place among Samuel Reshevsky, Vlastimil Hort, and Leonid Stein, who played a round-robin playoff to determine the final place in the Candidates matches. In the event of a tie, the player with the best Sonneborn-Berger tie break from the Interzonal would qualify.^[1] The playoff ended in a three-way tie, so Reshevsky qualified.

1967 Sousse Interzonal Tournament

		1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	Total	Tie break
1	Bent Larsen (Denmark)	-	0	½	½	0	1	1	1	1	½	1	1	1	½	0	1	½	1	1	1	1	1	15½
2	Viktor Korchnoi (Soviet Union)	1	-	½	½	1	½	½	½	0	½	0	0	½	1	1	1	1	1	1	1	½	1	14	136.00
3	Efim Geller (Soviet Union)	½	½	-	½	½	0	1	½	1	½	½	1	½	½	1	½	½	1	½	1	1	1	14	135.75
4	Svetozar Gligorić (Yugoslavia)	½	½	½	-	½	½	½	1	½	½	½	½	½	1	1	½	½	½	1	1	1	1	14	135.00
5	Lajos Portisch (Hungary)	1	0	½	½	-	½	½	1	0	½	½	½	½	1	1	½	1	½	½	1	1	1	13½
6	Samuel Reshevsky (United States)	0	½	1	½	½	-	½	½	1	½	½	1	½	½	½	½	1	1	0	1	1	½	13	129.75
7	Vlastimil Hort (Czechoslovakia)	0	½	0	½	½	½	-	1	½	½	1	½	½	½	½	½	½	1	1	1	1	1	13	120.25
8	Leonid Stein (Soviet Union)	0	½	½	0	0	½	0	-	½	½	½	1	1	½	1	1	1	1	1	1	1	½	13	117.00
9	Milan Matulović (Yugoslavia)	0	1	0	½	1	0	½	½	-	0	1	1	½	1	0	½	½	1	1	½	1	1	12½
10	Aleksandar Matanović (Yugoslavia)	½	½	½	½	½	½	½	½	1	-	½	1	½	½	½	½	1	½	0	1	½	½	12
11	Borislav Ivkov (Yugoslavia)	0	1	½	½	½	½	0	½	0	½	-	0	½	½	1	½	1	½	1	0	1	1	11	103.50
12	Henrique Mecking (Brazil)	0	1	0	½	½	0	½	0	0	0	1	-	1	1	1	½	½	½	1	½	1	½	11	102.50
13	Aivars Gipslis (Soviet Union)	0	½	½	½	½	½	½	0	½	½	½	0	-	½	0	1	½	0	1	½	1	1	10	93.75
14	Lubomir Kavalek (Czechoslovakia)	½	0	½	0	0	½	½	½	0	½	½	0	½	-	½	1	½	1	0	1	1	1	10	90.00
15	Duncan Suttles (Canada)	1	0	0	0	0	½	½	0	1	½	0	0	1	½	-	½	1	0	½	1	½	1	9½
16	István Bilek (Hungary)	0	0	½	½	½	½	½	0	½	½	½	½	0	0	½	-	½	½	1	0	1	1	9
17	László Barczay (Hungary)	½	0	½	½	0	0	½	0	½	0	0	½	½	½	0	½	-	½	1	½	½	1	8
18	Robert Byrne (United States)	0	0	0	½	½	0	0	0	0	½	½	½	1	0	1	½	½	-	1	½	½	0	7½
19	Miguel Cuéllar (Colombia)	0	0	½	0	½	1	0	0	0	1	0	0	0	1	½	0	0	0	-	0	1	1	6½	61.00
20	Lhamsuren Myagmarsuren (Mongolia)	0	0	0	0	0	0	0	0	½	0	1	½	½	0	0	1	½	½	1	-	0	1	6½	54.50
21	Ortvin Sarapu (New Zealand)	0	½	0	0	0	0	0	0	0	½	0	0	0	0	½	0	½	½	0	1	-	½	4
22	Slim Bouaziz (Tunisia)	0	0	0	0	0	½	0	½	0	½	0	½	0	0	0	0	0	1	0	0	½	-	3½

1968 Los Angeles playoff

		1	2	3	Total
1	Samuel Reshevsky (United States)	-	====	====	4
2	Vlastimil Hort (Czechoslovakia)	====	-	=0=1	4
3	Leonid Stein (Soviet Union)	====	=1=0	-	4

Spassky won the Candidates Tournament – as he did in the 1966 cycle – earning the right to challenge Petrosian for the World Championship a second time.

Larsen and Tal contested a third place playoff in the Dutch town of Eersel in March 1969, which Larsen won 5½–2½.

The match was played as best of 24 games. If it ended 12-12, Petrosian, the title holder, would retain the Championship.

Spassky won.

• 1969 World Chess Championship at the Internet Archive record of Graeme Cree's Chess Pages