|Citation(s)  2 NZLR 559||Decided 17 December 1998|
|Full case name Knyvett v Christchurch Casinos Ltd|
Judge(s) sitting Blanchard, Gallen and Salmon JJ
Ruling court Court of Appeal of New Zealand
Similar SGS (New Zealand) Ltd v Quirke Export Ltd, Rayneon (New Zealand) Ltd v Fraser, Starlight Enterprises Ltd v Lapco Enterprises Ltd
Knyvett v Christchurch Casinos Ltd  2 NZLR 559 is a cited case in New Zealand regarding whether a contract illegal under statute, can be subsequently validated under the Illegal Contracts Act 1970.
Polglase won a $31,173.71 jackpot at the Christchurch Casino, however when the casino later discovered that he was only 18 years old, a minor, they refused to pay him out his winnings.
The Casino argued that under the Casino Control Act 1990, gambling by a minor is illegal, and thus honoring any wager would be illegal under the Act.
However, the Act only prohibited a minor being on the premises of a Casino, it did not go as far as stating any bets would be illegal as well.
The casino successfully obtained a judgment from the High Court.
Polglase, via his guardian Kynvett appealed.
The court refused to grant relief.