These are the relevant references from the Books where Riddle Guessing is mentioned.
I make no pronouncements on these matters, but report them as I find them.
Arrive at your own conclusions.
I wish you well,
he did much better, I might mention, in the riddle guessing; but not well enough to win; he missed the following riddle; "What is black, has eighty legs and eats gold?"; the answer, though it might not seem obvious, was Black Sleen, the ship of Thorgard of Scagnar; the Forkbeard's answer had been Black Shark, the legendary ship of Torvald, reputed discoverer and first Jarl of Torvaldsland; he acknowledged his defeat in this contest, however, gracefully; "I was a fool." He grumbled to me. "I should have known!" Though I attempted to console him, he remained much put out with himself, and for more than an Ahn afterward.