A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet 6 inhabitants: Aiden, Mason, Matthew, Charlotte, Henry, and Zoey. Aiden commented, "If Zoey is a knight then Charlotte is a knave". "Charlotte is a knight," Mason declared. "Aiden is a knight or Charlotte is a knave" - Matthew. Charlotte noted, "Henry is not a knave". In Henry's words: "Aiden is a knave and Henry is a knight". According to Zoey, "Henry is not a knight". So who is a knight and who is a knave?
Aiden is a knight, Mason is a knave, Matthew is a knight, Charlotte is a knave, Henry is a knave, and Zoey is a knight.
(1) Aiden is a knight
(2) Mason is a knave
(3) Matthew is a knight
(4) Charlotte is a knave
(5) Henry is a knave
(6) Zoey is a knight
Assume Aiden is a knight. No contradiction is found in their claim that If Zoey is a knight then Charlotte is a knave. Assume Zoey is a knight. No contradiction is found in their claim that Henry is not a knight. Henry cannot be a knight, because this would contradict the claim of their own that Aiden is a knave and Henry is a knight. Assume Henry is a knave. No contradiction is found in their false claim that Aiden is a knave and Henry is a knight. Charlotte cannot be a knight, because this would contradict the claim of Aiden that If Zoey is a knight then Charlotte is a knave. Assume Charlotte is a knave. No contradiction is found in their false claim that Henry is not a knave. Mason cannot be a knight, because this would contradict the claim of their own that Charlotte is a knight. Assume Mason is a knave. No contradiction is found in their false claim that Charlotte is a knight. Assume Matthew is a knight. No contradiction is found in their claim that Aiden is a knight or Charlotte is a knave.