Saltsjöbaden 1948 Interzonal

◇The first rung of the ladder

With Alexander Alekhine's death in 1946, FIDE took control of the world championship and built the qualification system that would define the next half-century: national and zonal tournaments feeding an Interzonal, whose leaders advanced to a Candidates tournament to produce a challenger. Saltsjöbaden 1948 was the first Interzonal ever held, the inaugural stage of that ladder.

Twenty players contested a single round-robin of nineteen rounds — 190 games in all — in the Swedish resort town of Saltsjöbaden, near Stockholm. The field mixed the rising Soviet school with established internationals: Bronstein, Kotov, Boleslavsky, Lilienthal and Bondarevsky alongside László Szabó, Miguel Najdorf, Gideon Ståhlberg, Salo Flohr, Svetozar Gligorić, Vasja Pirc and the veteran Savielly Tartakower.

◇Szabó falters, Bronstein overtakes

For much of the event the Hungarian László Szabó led, but he stumbled at the finish and lost his final-round game to the tail-ender Erik Lundin. That slip let Bronstein pass him: the young Soviet finished first on 13½/19, a point clear of Szabó on 12½, with Boleslavsky third on 12, Kotov fourth and Lilienthal fifth.

Bronstein was the only player in the tournament to go through unbeaten. The top finishers earned places in the 1950 Candidates — a field originally set at five that grew to eight after Reshevsky, Fine and Euwe declined to travel, drawing in Najdorf, Ståhlberg, Flohr and Bondarevsky (who later withdrew through illness).

◇Where it led

Saltsjöbaden was the start of a great run for Bronstein. He went on to share first at the 1950 Candidates in Budapest and win the playoff against Boleslavsky, earning the right to challenge Mikhail Botvinnik. Their 1951 world championship match ended 12–12, five wins each and fourteen draws, and under the rules of the time Botvinnik kept the title. Bronstein remains one of the strongest players never to become world champion.