One of the mysteries of the English language finally explained.
Of, relating to, or designating a chess tournament in which each of the players plays each of the others in turn.
An all-play-all tournament.
1950s; earliest use found in British Chess Magazine. From all [noun] + play + all [noun].
all-play-all/ˌɔːl pleɪ ˈɔːl/
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