A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet 6 inhabitants: Samuel, Aurora, Owen, Evelyn, Jacob, and Sofia. "Owen is a knight," Samuel claimed. As Aurora put it, "If Sofia is a knight then Jacob is a knave". As Owen put it, "Jacob is a knave and Aurora is a knight". Evelyn expressed that Aurora is not a knight. In Jacob's words: "Samuel is a knave and Owen is a knave". Sofia said that If Jacob is a knight then Evelyn is a knave. So who is a knight and who is a knave?
Samuel is a knight, Aurora is a knight, Owen is a knight, Evelyn is a knave, Jacob is a knave, and Sofia is a knight.
(1) Samuel is a knight
(2) Aurora is a knight
(3) Owen is a knight
(4) Evelyn is a knave
(5) Jacob is a knave
(6) Sofia is a knight
Assume Samuel is a knight. No contradiction is found in their claim that Owen is a knight. Assume Owen is a knight. No contradiction is found in their claim that Jacob is a knave and Aurora is a knight. Jacob cannot be a knight, because this would contradict the claim of Owen that Jacob is a knave and Aurora is a knight. Assume Jacob is a knave. No contradiction is found in their false claim that Samuel is a knave and Owen is a knave. Assume Aurora is a knight. No contradiction is found in their claim that If Sofia is a knight then Jacob is a knave. Assume Sofia is a knight. No contradiction is found in their claim that If Jacob is a knight then Evelyn is a knave. Evelyn cannot be a knight, because this would contradict the claim of their own that Aurora is not a knight. Assume Evelyn is a knave. No contradiction is found in their false claim that Aurora is not a knight.