For the third day of Child Genius the 14 remaining competitors take on geography. With questions in the morning round covering 4.5 billion years of our planet's history, the nerves are really kicking in. And the stakes couldn't be higher as the competitor with the lowest score will face immediate elimination. In the afternoon the remaining competitors take on a challenging memory round in which they must memorise a sequence from a pack of 100 randomly shuffled cards, each with an image of a different world flag. At the end of that round, a further two competitors will be knocked out.

The semi-final of the Child Genius competition. Nearly half of the eight remaining competitors will be knocked out today, as only five can make it through to tomorrow's final. To make matters worse, illness threatens to derail one competitor and nerves nearly send another crashing out. Quizmaster extraordinaire Richard Osman presides over today's gruelling language rounds. In the first round, the competitors face fiendishly difficult definitions and anagrams, as their understanding of the English language is stretched to its limit. In the afternoon it's sudden death spelling, where one false move could send even the morning's top scorer home.