Cika wannan jumla:
1986 Gasar Zakarun Duniya ta Judo, Guy ya lashe lambar tagulla a gasar da ta kasa da kilo 61. Ita ce kawai New Zealander da ta ci lambar yabo a Gasar Zakarun Duniya ta Judo. A wannan shekarar, Guy ya zo na biyu a wasan kwaikwayon judo a Wasannin Commonwealth na 1986 a Edinburgh, Scotland, inda ya yi rashin nasara a wasan karshe da Diane Bell. Guy ya kuma yi gasa a New Zealand a Wasannin Olympics na 1988 a Seoul, Koriya ta Kudu. A Wasannin Commonwealth na 1990 a Auckland, New Zealand, Guy-Halkyard ya zo na biyu a gasar da ke kasa da kilo 61, inda ya yi rashin nasara ga dan Birtaniya Diane Bell a wasan karshe.