Elephant polo, played in Nepal, Sri Lanka and Thailand by a wealthy few to the rules of horse polo but on a smaller field, is uniquely challenging.

象球是一项具有特殊挑战性的运动，它在尼泊尔，斯里兰卡和泰国的富人中十分盛行。象球采用马球的规则，只是场地比马球场小。

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In fact, it is now challenging horse racing as the largest sport betting market globally, with much of the huge boom in football gambling coming in Asia.

BBC: Sport and gambling united against cheating

Adding another food source (horse meat) that is so challenging and impossible to trace is NOT what our USDA needs or the taxpayers need in this country.

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By the mid-1950s Dilip Kumar, the quintessential tragic hero of the earlier days, was challenging the system in Naya Daur, as a horse carriage driver fighting a new bus service.

BBC: How Bollywood mirrors Indian realities