He two times won Ulster Chess Championships: 1939, and 1945.
Also William Minnis two times won Belfast Feis chess tournament (1940, 1944) and won Williamson Shield chess tournament in 1949.
[1][2] William Minnis two times participated in Irish Chess Championships (1946, 1947).
[3] William Minnis played for Ireland in the Chess Olympiad:[4]
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