Chess puzzle No. 742

Time was, a Barbour meant one thing: the classic Beaufort model that stank of wax, wet dog, and had pockets stuffed with cartridges from a shoot. Naturally, the late Queen Elizabeth modelled it best, standing at Balmoral in hers with her trademark neckerchief. There is an apocryphal tale that, like all die-hard Barbour devotees, the