prize13-6, Exercise 1: Why London 1851 matters

Model answer (check the details):

London 1851 is usually treated as the first international chess tournament. Howard Staunton organised it alongside the Great Exhibition, sixteen players took part under common rules, and Adolf Anderssen of Germany won, beating Staunton 4-1 in the later rounds. It showed that players from several countries could be brought together and a single result obtained, which is the pattern of all later international competition.

What it did not establish: there was no official title of world champion, no federation, and no rating system. Anderssen was regarded as the strongest player, but the title came later (Chapter 7). The knockout format was also a poor test of strength, since one bad game could end a strong player's run.

Care: "first" depends on what counts as an international tournament; earlier matches between players of different countries existed.