CHECK AND MATE? Abigail Brand enters her endgame - and on Arakko, the Diplomatic Zone is beset by a firestorm of violence. On the World Farm, Cable is learning the secrets behind it all. But the biggest secret has yet to be revealed? It\'s Roberto Da Costa\'s turn to play. And you won\'t see it coming. Rated T+ (W) Al Ewing (A) Stefano Caselli (CA) Russell Dauterman