Checkers is the only board game I know of that has world championships in several variants. The 'standard' 8x8 game (English Draughts), International Checkers 10x10, Brazilian Checkers and Russian Checkers. The Russian and Brazilian Championships are organized by Draughts-64. 

Checkers' World Champions ('English Draughts')
After 1994, the championship was divided into a "go as you please" (GAYP) and a 3-move event where the first 3 moves are set up.

1840–1844  Andrew Anderson (Scotland)
1844–1847  James Wyllie (Scotland)
1847–1849  Andrew Anderson (Scotland)
1849–1859. James Wyllie (Scotland)
1859–1864. Robert Martins (Scotland)
1864–1876. James Wyllie (Scotland)
1876–1878. Robert D. Yates (United States)
1878–1894. James Wyllie (Scotland)
1894–1896. James Ferrie (Scotland)
1896–1903. Richard Jordan (Scotland)
1903–1912. James Ferrie (Scotland)
1912–1917. Alfred Jordan (England)
1917–1922. Newell Banks (United States)
1922–1933. Robert Stewart (Scotland)
1933–1934. Newell Banks (United States)
1934–1948. Asa Long (United States)
1948–1955. Walter Hellman (United States)
1955–1958. Marion Tinsley (United States)
1958–1975. Walter Hellman (United States)
1975–1991. Marion Tinsley (United States)
1991–1994. Calum Patten (England)

(Go As You Please  World Championship)
1994–2014  Ron King (Barbados)
2014–2016  Sergio Scarpetta (Italy)
2016–2018  Michele Borghetti (Italy)
2018–      Lubabalo Kondlo (South Africa)

(Set 3-Move World Championship)
1994–2002  Ron King (Barbados)
2003–2013  Alex Moiseyev (United States)
2013–2017  Michele Borghetti (Italy)
2017-      Sergio Scarpetta (Italy)


(Go As You Please: Women's world championship)
2006–2012. Amangul Durdyyeva (Turkmenistan)
2013–2015. Nadiya Chyzhevska (Ukraine)
2015–2017. Amangul Durdyyeva (Turkmenistan)
2017–.     Nadiya Chyzhevska (Ukraine)

(Set 3-Move: Women's World Championship)
1986–1993. Joan Caws (United Kingdom)
1993–2007. Patricia Breen (Ireland)
2007–2012. Amangul Durdyyeva (Turkmenistan)
2012–2016. Nadiya Chyzhevska (Ukraine)
2016–2018. Amangul Durdyyeva (Turkmenistan)
2018—      Tetiana Zaitseva (Ukraine)



International Checkers World Champions
1885-1895   Alfred Dussaut (France)
1895-1899.  Eugène Leclercq (France)
1899-1912   Isidore Weiss (France)
1912        Alfred Molimard (France)
1912-1925   Herman Hoogland (Netherlands)
1925-1926   Stanislas Bizot (France)
1926-1928   Marius Fabre (France)
1928-1931   Benedictus Springer (Netherlands)
1931-1933   Marius Fabre (France)
1933-1938   Maurice Raichenbach (France)
1945-1948   Pierre Ghestem (France)
1948-1956   Piet Roozenburg (Netherlands)
1956-1958.  Marcel Deslauriers (Canada)
1958-1960   Iser Kuperman (Soviet Union)
1960-1961   Vyacheslav Shchyogolev (Soviet Union)
1961-1963   Iser Kuperman (Soviet Union)
1963-1964   Baba Sy (Senegal)
1964-1965.  Vyacheslav Shchyogolev (Soviet Union)
1965-1968   Iser Kuperman (Soviet Union)
1968-1972   Andris Andreiko (Soviet Union)
1972-1974   Ton Sijbrands (Netherlands)
1974-1976   Iser Kuperman (Soviet Union)
1976-1978   Harm Wiersma (Netherlands)
1978-1979   Anatoli Gantvarg (Soviet Union)
1979-1980   Harm Wiersma (Netherlands)
1980-1981   Anatoli Gantvarg (Soviet Union)
1981-1982   Harm Wiersma (Netherlands)
1982-1983   Jannes van der Wal (Netherlands)
1983-1984.  Harm Wiersma (Netherlands)
1984-1986.  Anatoli Gantvarg (Soviet Union)
1986-1988.  Alexander Dybman (Soviet Union)
1988-1994.  Alexei Chizhov (Soviet Union)
1994-1995.  Guntis Valneris (Latvia)
1995-1998.  Alexei Chizhov (Russia)
1998-2000.  Alexander Schwartzman (Russia)
2000-2003.  Alexei Chizhov (Russia)
2003-2005.  Alexander Georgie (Russia)
2005-2006.  Alexei Chizhov (Russia)
2006-2007.  Alexander Georgie (Russia)
2007-2011.  Alexander Schwartzman (Russia)
2011-2016.  Alexander Georgie (Russia)
2016-2017.  Roel Boomstra (Netherlands)
2017-2018.  Alexander Schwartzman (Russia)
2018-2019   Roel Boomstra (Netherlands)
2919-       Alexander Georgie (Russia)

International Checkers Women's World Champions
1973-1979.  Elena Mikhailovskaya (Soviet Union)
1979-1980.  Ludmilla Meijler-Sochnenko (Soviet Union)
1980-1981.  Elena Altsjoel (Soviet Union)
1981-1982.  Olga Levina (Soviet Union)
1982-1986.  Elena Altsjoel (Soviet Union)
1986-1987.  Zoja Golubeva (Soviet Union)
1987-1988.  Olga Levina (Soviet Union)
1988-1989.  Zoja Golubeva (Soviet Union)
1989-1990.  Olga Levina (Soviet Union)
1990-1993.  Zoja Golubeva (Soviet Union)
1993-1994.  Olga Levina (Ukraine)
1994-2001.  Zoja Golubeva (Latvia)
2001-2003.  Tamara Tansykkuzhina (Russia)
2003-2004.  Olga Kamyshleeva (Netherlands)
2004-2005.  Tamara Tansykkuzhina (Russia)
2005-2007.  Darya Tkachenko (Ukraine)
2007-2008.  Tamara Tansykkuzhina (Russia)
2008-2010   Darya Tkachenko (Ukraine)
2010-2011   Zoja Golubeva (Latvia)
2011-2013.  Tamara Tansykkuzhina (Russia)
2013-2016   Zoja Golubeva (Latvia)
2916-2017.  Natalia Sadowska (Poland)
2017-2018   Zola Golubeva (Latvia)
2018-2019.  Natalia Sadowska (Poland)
2019        Tamara Tansykkuzhina (Russia)


Brazilian Checkers World Champions
1985-1987    Aleksander Kandaurov
1987-1993    Alexander Schwarzman
1993-1996.   Lourival Franca, Ion Dosca, Iser Kuperman (tie)
1996-1997    Alexander Schwarzman
1997-1999.   Andrey Valyuk
1999-2002.   Ian Dosca
2002-2004.   Gavril Kolesov
2004-2007.   Yuri Aniheev
2007-2008    Nicolay Struchkov
2008-2012.   Alexander Schwarzman
2012-2016.   Gavril Kolesov
2916-2018.   Alexander Georgiev
2018-        Alexander Schwarzman

Brazilian Checkers Women World Champions (only two championships have been held under these rules.
2007.           Viktoriya Motrichko
2018.           Olena Korotko

Russian Checkers World Champions
1993-1994.   Murodocillo Amrillaev
1994-1996.   Arkady Plakhin
1996-1998.   Gavril Kolesov
1998-2000.   Valery Grebenkin
2000-2003.   Gavril Kolesov
2003-2004.   Yuri Korolev
2004-2005.   Gavril Kolesov
2005-2006.   Andrey Valyuk
2006.              Gavril Kolesov
2006-2009.   Nicolay Struchkov
2009-2011.   Sergey Belosheev
2011-2013.   Oleg Dashkov
2013-2015.   Nicolay Struchkov
2015-2017.   Sergey Belosheev
2017-2018.   Igor Mikhalchenko
2018-2019.   Andre Fedotov
2019-2020.   Igor Mikhalchenko
2020-        Andre Fedotov


Russian Checkers Women's World Champions
1993-1994.   Ekaterina Bushueva
1994-1996.   Yulia Makarenkova
1996-1997.    Olga Reinish
1997-1999.    Ekaterina Bushueva
1999-2001.    Yulia Makarenkova
2001-2003.    Elena Borisova
2003-2005.    Antonina Langina
2005-2009.    Elena Borisova
2009-2011.    Yulia Makarenkova
2011-2013.    Natalia Fedorva
2013-2015.    Zhanna Sarshaeva
2015-2017.    Elena Scovitina
2017-2018.    Zhanna Sarshaeva
2018-2019.    Olena Korotka
2019-2020.    Yana Yakubovich
2020-         Yulia Makarenkova