Machgielis (Max) Euwe (May 20, 1901 – November 26, 1981) was a Dutch chess Grandmaster and Mathematician. He was the fifth player to become World Chess Champion (1935–1937). Euwe also served as President of the World Chess Federation (FIDE) from 1970-1978. Wikipedia
The definitive Wikipedia entry for Max Euwe. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Max_Euwe