Alexander Alekhine
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Alexander Aleksandrovich Alekhine was a Russian and French chess player and the fourth World Chess Champion, a title he held for two reigns.
Alekhine in 1909
Alekhine (left) vs. Efim Bogoljubov (right); Emanuel Lasker (sitting, center) and others looking on
Grave of Alexander Alekhine in Paris, France (reconstruction of the original which was destroyed in 1999)
Mikhail Botvinnik
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Mikhail Moiseyevich Botvinnik was a Soviet and Russian chess grandmaster who held five world titles in three different reigns. The sixth World Chess Champion, he also worked as an electrical engineer and computer scientist and was a pioneer in computer chess. He also had a mathematics degree (honorary).
Botvinnik in 1927
Botvinnik vs. Lasker, 1936
Levenfish vs. Botvinnik (right), 1937