A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet two inhabitants: Amy and Brittany. Amy tells you that Brittany is a knave. Brittany says, 'Neither Amy nor I are knaves.' What are Amy and Brittany? knights and knaves. Now, knights are people who always tell the truth and knaves always lie. The task is to logically deduce a fact (usually on the identity of the knight or knave). This is usually done by piecing together information from what the inhabitants say. Figure 1: In knights and knaves problems, knights are people who always tell the ...

Educational introduction to best mental exercises and logical thinking by using essential, interesting and entertaining information supplemented with free photos and images which are in the public domain or licensed under a Creative Commons License or GNU Free Documentation License.This page describes Raymond Smullyan's puzzles - one of the 12 Best mental exercises. The inhabitant will eat their hat . Given that Knights always tell the truth and Knaves always lie: If a knight makes that statement, he will eat his hat, and if a knaves makes that statement, everything in that statement would be the opposite.

Logic puzzles have been developed to test students’ skill in logical reasoning. Two classes discussed here: The Island of Knights and Knaves Portia’s Casket Exploitation of the associativity of equivalence simpli es the problems considerably.

These puzzles have to do with a strange island inhabited by two types of people: people who only tell the truth (knights) and people who only tell lies (knaves). Raymond Smullyan collected dozens of puzzles like this in his book, What is the Name of This Book?. The following list progresses quickly from easy to very difficult. Knights and knaves. Knights and knaves is a classic puzzle most of you will likely have come across already. It comes in many different forms, but it generally goes as follows: You come across two doors on your path, guarded by two guards.