There are more possible chess game combinations than there are particles in the known universe.
This fact is lengthy but scary->
Abraham Lincoln was elected to Congress in 1846. John F. Kennedy was elected to Congress in 1946
Lincoln failed to win the Vice Presidential nomination in 1856.
Kennedy failed to win the Vice Presidential nomination in 1956.
Abraham Lincoln was elected President in 1860.
John F. Kennedy was elected President in 1960.
Lincoln defeated Stephen Douglas who was born in 1813.
Kennedy defeated Richard Nixon who was born in 1913.
Both were particularly concerned with civil rights.
Both wives lost children while in the White House.
Both Presidents were shot on a Friday.
Both Presidents were shot in the head.
Lincoln's secretary was named Kennedy.
Kennedy's secretary was named Lincoln.
Both were assassinated by Southerners.
Both were succeeded by Southerners.
Both Presidents had Vice Presidents named Johnson.
Lincoln's Vice President was called Andrew Johnson who served in the House of Representatives in 1847.
Kennedy's Vice President was called Lyndon Johnson who served in the House of Representatives in1947.
Both successors (their Vice Presidents) were named Johnson.
Andrew Johnson, who succeeded Lincoln, was born in 1808. Lyndon Johnson, who succeeded Kennedy, was born in 1908.
John Wilkes Booth, who assassinated Lincoln, was born in 1838. (not 1839)!
Lee Harvey Oswald, who assassinated Kennedy, was born in 1939.
Both assassins were known by the three names.
Both names are composed of fifteen letters.
Lincoln was shot at the theatre called "Ford."
Kennedy was shot in a car named "Lincoln", made by Ford.
Booth ran from the theater and was caught in a warehouse.
Oswald ran from a warehouse and was caught in a theater.
Booth and Oswald were assassinated before their trials.
NOTE: President Lincoln was born on February 12, 1809 and died on April 15, 1865 (age 56) President Kennedy was born on May 29, 1917 and died on Nov 22, 1963 (age 46)