Ireland bolstered their hopes of a third successive Guinness Six Nations title as they made it 11 wins in a row over Scotland with a ruthless bonus-point 32-18 triumph at Murrayfield. The Scots endured a disastrous first half in which they allowed the dominant Irish to build a 17-0 lead through tries from Calvin Nash and captain Caelan Doris while also losing three of their most influential backs: Duhan van der Merwe to a yellow card,