Beijing has used rare earth controls to win the first skirmishes in the war over commerce, says Alan Beattie for the Financial Times. LONDON: In the cult film The Princess Bride, the hero Westley tricks a villain, Vizzini, into killing himself in a battle of wits. Vizzini has to choose between two cups of wine, one of which Westley says is poisoned. In fact, Westley’s cup is also poisoned, but he survives: he had spent years building up immunity to the toxin. Through long and careful