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Off the court, Draper has spent nights in Indian Wells playing Monopoly Deal - a shorter version of the classic board game - and refuelling with healthy takeaways.

She is keen for her son to learn both chess and the strategy board game Go – the robot does both, which persuaded her that its $800 price tag was a good investment.

Mr Zuckerberg, she says, did not get up before midday, loved karaoke and did not like to be beaten at board games, such as Risk.

The business of the North American Toy Fair, an annual showcase of the latest in silly putty, monster trucks and board games, is fun.

He began a lifelong love of quizzing when playing board game Trivial Pursuit in the 1980s, and has since gone on to face down Anne Robinson in The Weakest Link and take on the Chasers.