Armenia: the cleverest nation on earth

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Armenia - a tiny, poor country of around three million people - has won the chess Olympics twice in a row. In so doing, it has triumphed over giants like Russia, China and the US. Chess is pursued fanatically in many parts of the world, but nowhere more so than Armenia, where its over-the-board stars have become national celebrities. But how has little Armenia created a nation of chess geniuses - is there something in the water? Assignment investigates.