Cfn. Ychw. cfn. pellach

cast y (g)wniadur - thimble-rig, 1833

OED thimblerig. A swindling game usually played with three thimbles and a pea which was ostensibly placed under one of them; the sharper then challenging the/their [?] bystanders to guess under which the pea had been placed, and to bet on their choice.