Armenia: the cleverest nation on earth
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.