16 birthdays, 7 matches, tournaments and games and 7 deaths from chess history on October 25.

200224 years ago today
35th Chess Olympiad began
Card photo: Unknown authorUnknown author, Public domain, via Wikimedia Commons
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Matches, tournaments and games
- 19271927 USSR Chess ChampionshipEnded · won by Peter Romanovsky
- 197823rd Chess OlympiadBegan
- 1978Women's Chess Olympiad 1978Began
- 200235th Chess OlympiadBegan
- 2023FIDE Grand Swiss Tournament 2023Began · won by Vidit Gujrathi
- 2023FIDE Women's Grand Swiss Tournament 2023Began · won by Vaishali Rameshbabu
- 20252025 United States Chess ChampionshipEnded · won by Fabiano Caruana
Born on October 25
- 1889Friedrich Palitzsch
- 1891Marcel BarzinBelgian politician
- 1929Zdravko MilevBulgarian chess player
- 1930Joaquim DurãoChess player
- 1930Károly HonfiHungarian chess player
- 1933James SherwinAmerican chess player
- 1941Juhani SorriFinnish chess player
- 1952Konstanty KaiszauriSwedish chess player
- 1969Slavko CicakSwedish chess player
- 1973Daniel José QueraltóAndorran chess player
- 1977Gediminas ŠarakauskasLithuanian chess player
- 1979Björn ThorfinnssonIcelandic chess player
- 1983Lyubka GenovaBulgarian chess player
- 1984Ticia GaraHungarian chess player
- 1985Arkadij NaiditschLatvian-German chess player
- 1994Ray RobsonAmerican chess player
Died on October 25
- 1733Giovanni Girolamo SaccheriItalian Jesuit and mathematician
- 1910Adolf SchwarzAustro-Hungarian chess player
- 1954Artūrs ĶeirānsLatvian chess composer
- 1957Edward Plunkett, 18th Baron of DunsanyIrish writer and dramatist
- 1962Abe TurnerAmerican chess player
- 1967Árpád VajdaChess player
- 2002Guy MazzoniFrench physician and chess player
Dates from Wikidata (CC0). Photos from Wikimedia Commons, credited on each card. Dates can differ between sources, especially before 1918 when Russia used the old calendar.