Elwyn R. Berlekamp (EDT)/ John Horton Conway/ Richard K. Guy/ Elwyn R. Berlekamp/ John Horton Conway (EDT)/ Richard K. Guy (EDT)
(1)
Elwyn R. Berlekamp/ John Horton Conway (EDT)/ Richard K. Guy (EDT)/ Elwyn R. Berlekamp (EDT)/ John Horton Conway/ Richard K. Guy
(1)
Martin Gardner (EDT)/ Elwyn Berlekamp (EDT)/ Tom Rodgers (EDT)
(1)