In 1965, he won first place in the Swiss Chess Championship, but lost additional match.
[2] Although Walther shared only 13th place (behind winner Mikhail Tal), he played a drawn game with future World Chess Champion Bobby Fischer, in which Fischer only just managed to save a lost game, partly by exploiting of the possibilities of an endgame with opposite colored bishops two pawns down.
[6] In later years, Walther actively participated in correspondence chess tournaments.
He won the Goldenen Springer tournament (196/7-1971) and the Swiss Correspondence Chess Championship.
[7] In 1978, Edgar Walther was awarded the International Correspondence Chess Master (ICM) title.