Having never been a cricket fan I only ask in the interest of logic, but how was it that we technically 'retained' the Ashes after winning the third of four games and what is the point of having an even number of games in a 'test series'? It seems like we could have technically drawn the 'series' but still won/retained the ashes.
Oh and what's the big deal with 'retaining' the ashes rather than just winning them?

