14 birthdays, 1 match, tournament or game and 7 deaths from chess history on May 21.

1853173 years ago today
Lionel Kieseritzky died
Baltic German chess player
Card photo: Wikimedia Commons, Public domain, via Wikimedia Commons
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Matches, tournaments and games
- 19441944 USSR Chess ChampionshipBegan · won by Mikhail Botvinnik
Born on May 21
- 1909Lucijs EndzelinsLatvian-Australian chess player
- 1927Rafael Saborido i CarnéSpanish chess player
- 1941Gertrude BaumstarkRomanian chess player
- 1946Larry ParrAmerican chess player
- 1960Zigurds LankaLatvian chess player
- 1960Liang JinrongChinese chess player
- 1966Zdenko KožulCroatian chess grandmaster
- 1966Russell DiveChess International Master
- 1966Vilma PaulauskienėLithuanian chess player
- 1969Nikolaj NinovBulgarian chess player
- 1971Alexandre DgebuadzeBelgian chess player
- 1986Gadir GuseinovAzerbaijani chess grandmaster
- 1997Rasmus SvaneGerman chess player
- 2002Lara SchulzeGerman chess player
Died on May 21
- 1853Lionel KieseritzkyBaltic German chess player
- 1949Bjørn NielsenDanish chess player
- 1975Remo CalapsoItalian chess player
- 2007Alexander RoshalSoviet chess writer
- 2015Joaquim DurãoChess player
- 2015César BouttevilleFrench-Vietnamese chess player
- 2026Jan AdamskiChess 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.