We found subtitles for the program knights and knaves. All the knights and knaves problems assume that each person encountered is either a knight or a knave, but not both. When the sixth series of qi began in 2008, the show moved to bbc one and the broadcasting of episodes on bbc four was replaced in favour of an extended repeat broadcast on bbc two the following day, titled qi xl. Qi xl s11 ep12 knights and knaves hd stream watch qi xl s11 ep12 knights and knaves online watch qi xl s11 ep12 knights and knaves online stream. A very special island is inhabited only by knights and knaves. Knights always tell the truth they never lie, while knaves always lie they never tell the truth.
This was a collection of ingeneous and challenging logical puzzles that popularized knights, who always told the truth, and knaves, who always lied. Victoria coren, sue perkins, rev richard coles and alan davies are his guests at the round table. More formally, if we decide to represent the statement p is a knight by p, then the statement p is a knave is represented by. With stephen fry, alan davies, richard coles, victoria coren mitchell. Now, knights are people who always tell the truth and knaves always lie. Jul 10, 2009 the setting for these puzzles is an island, all of whose inhabitants are either knights or knaves. It was created by john lloyd, and was hosted by stephen fry until the end of series m after which sandi toksvig took over, and features permanent panellist alan davies. Knights and knaves logic puzzles were made popular by the logician and mathematician raymond smullyan. Smullyan, has a whole bunch of logical puzzles, especially ones about truth logic, in the form of problems with knights and knaves, dracula, alice in wonderland and so forth. It airs on fridays and in a longer format xl on saturdays on bbc two.
Amy, bob, and celine are from the island of knights, knaves, and normals. You somehow god told you know that they are knight, knave and joker. A guide to knights and knaves, episode 12 from series k of qi. I wont go too deep into their history as you will easily find that in many other sources. An islander call him a made a statement about himself and a friend, call him b. The premise of the knights and knaves problem is as follows. If there are two knights, a is one of them, and he would have said truthfully that there are two knights. Remember, everything a knight says is true and everything a knave says is false. The island of knights and knaves3 the island has two types of inhabitants, \knights who always tell the truth, and \knaves who always lie. You ask jack whether he is a knave, but cant make out his response. Can you determine who is a knight and who is a knave. Qi s17e16 quads and quins 720p hdtv x264linkle eztv 394. Its just that knights and knaves are guaranteed to make opposite claims about the two other people as to whether theyre the spy.
You ask jill what jack said, and she replies, jack said that he is a knave. Therefore, depending on what a is, the actual number of knights is either 1 or 2 if there are two knights, a is one of them, and he would have said truthfully that there are two knights. Knights and knaves another truth and liar problem brilliant. Helena mcgahagan imagine an island inhabited only by knights and knaves. View knights and knaves logicpuzzles 2 from cs 1501 at university of pittsburgh. Smullyan 1978 is a rich source of these puzzles, of which the following is an example. Knights and knaves is a basic puzzle used in the fields of mathematics, analysis, or any area of study that utilizes logic. If you asked me, i would say that b is the spy or if you asked, i would say c is not the spy this statement means that c is not the spy.
Chris knight 1998 a pretty good guy 2001 the jealous kind 2003 enough rope 2006 from. Knights and knaves is a type of logic puzzle where some characters can only answer questions truthfully, and others only falsely. Knights templar, and there are still some knights templar lying around. Qi s17e16 quads and quins hdtv x264linkle eztv 148. B would violate the assumption if a was a knight an b was a knave. Since c claims that b is a knave, b and c must have different alignments. A journey to the land of logic altha rodin math teachers circle of austin september 25, 2014 tweedledee.
Knights and knaves these problems are quoted or sometimes modified from the wonderful logic puzzle books of raymond smullyan, in particular his book what is the name of this book. You have just arrived on an island inhabited by two kinds of people. Richard coles, victoria coren mitchell and sue perkins. The problem was developed and popularized by mathematician raymond smullyan, who is known well, maybe not for being prolific in recreational mathematics.
The knights and spies problem is just like the knights and knaves problem except that agents which are not knights are spies. On the island of knights and knaves, you meet three people, jack, jill, and jim. To start the series off, lets have a simple conversation with these knaves and these knights. The name was coined by raymond smullyan in his 1978 work what is the name of this book the puzzles are set on a fictional island where all inhabitants are either knights, who always tell the truth, or knaves, who always lie. Victoria coren, sue perkins, rev richard coles and alan davies are his guests at the. Dec 30, 2015 mo and zoe are either both knights or both knaves. Other people have found out about the knights and knaves, and some have moved to the island. Mo and nellie are the same type of islander as robby. Unlike any other quiz show you will have failed to avoid catching, qis questions are impossible to answer, but at least the guest panel of topshelf comedians can laugh at themselves and the universe in general while trying. The last two statements have the property that knightsknaves give identical answer to the question posed, and the statement reveals something about another role without revealing anything about the speaker. On the island of knights and knaves there live only two types of people. In this case, john is a knave and bill is a knight.
There is an excalibur casino in las vegas which holds a mock jousting contest as part of their dinner show. The nice thing about this whole setup is that, covering the last two cases, any statement whatsoever is reducible to one of the above forms based on the permutations it eliminates. Qi series k, episode 12 knights and knaves british. The knights are on the bottom row tarot cards and the knaves are on the top row jacks, in poker cards. Mar 15, 2005 a very special island is inhabited only by knights and knaves. He replied, but i could not figure out what they were, so i asked the shorter man if the taller was a knight. Bbc, christianity, funny, religion, stephen fry, video. Qi series k, episode 12 knights and knaves british comedy. These puzzles were popularized in books by raymond smullyan.
Qi xl s11 ep12 knights and knaves hd watch dailymotion. View knightsandknaveslogicpuzzles 2 from cs 1501 at university of pittsburgh. Suppose ais the proposition \person a is a knight and suppose a makes a statement s. Dec 07, 2017 you might remember a knights and knaves puzzle from the 1986 fantasy film, labyrinth. You are allowed to ask questions of the form person i, is person j a knight. Think again, says julian le grand wed 17 sep 2003 11. Each series covers topics that begin with a different letter of the alphabet. On this island, there are people called knights who always tell the truth and knaves who always lie. Qi knights and knaves tv episode 20 release info imdb. Qi k episode 12 knights and knaves dailymotion video. Qi stands for quite interesting and is a hilarious quizshow where the guests get points for giving interesting answers. B would violate the assumption if a was a knave and b was a knight, b would voilate the assumption only if they both are knaves can they satisfy the assumptions.
All knights and knaves problems assume that knights always tell the truth and knaves always lie. Qi series k, episode 12 knights and knaves british comedy guide. Download subtitles for knights and knaves with victoria coren, sue perkins, rev richard coles and alan davies. His most famous have to do with a mythical island of knights and knaves. Knight and knaves in 1978, raymond smullyan, a professor of mathematical logic, produced a book with the whimsical title what is the name of this book. Therefore, depending on what a is, the actual number of knights is either 1 or 2. Every inhabitant of the island is either a knight or a knave, and everyone knows which inhabitants are knights and which are knaves. Knights and knaves logic puzzle 1 quiz by twotoneteacher. Johns statement cannot be true, because a knave admitting to being a knave would be the same as a liar telling the lie i am a liar, which is known as the liar paradox. As you approach the island, you spot three inhabitants on the shore. Here is an excellent puzzle with 3 types of characters. Sep 17, 2003 so you think public sector staff are knights not knaves. So you think public sector staff are knights not knaves. We have three people a, b, and c on the island of knights and knaves.
Knights always tell the truth, and knaves always lie. Download knights of honor torrent or any other torrent from windows category. Aug 19, 2015 what is the name of this book, by ramond m. Knights still always tell the truth, knaves always lie, but normals can do either. Dec 31, 2007 download knights of honor torrent or any other torrent from windows category. You might remember a knights and knaves puzzle from the 1986 fantasy film, labyrinth. There is an island far off in the pacific, called the island of knights and knaves. John and bill are residents of the island of knights and knaves. Knights who always speak the truth and knaves who always lie. In the classic knights and knaves problem, there are n people in a room each of whom is a knight or a knave. Where can i find questions for knights and knaves to practice. From the ninth series, qi returned to bbc two on friday at 10 pm with the xl edition on saturdays. A knights and knaves puzzle typically consists of a challenge to make a logical deduction based on the simplicity of the setting.
The task is to logically deduce a fact usually on the identity of the knight or knave. Knights, knaves, and logical reasoning fabio papacchini 1 puzzles in these exercises, you have met two natives called, imaginatively, a and b and you wish to establish as much information as you can about their status as knights or knaves. Qi short for quite interesting is a bbc comedy panel game television show that began in 2003. Find out when qi xl is on tv, including series 11episode 12. The first knight has x knaves to his left and y1 knights to his right, so x y1. Bbc two and bbc one panel show about quite interesting facts. I met two men who lived there and asked the taller man if they were both knights. Knight, knave and joker puzzle puzzling stack exchange.
242 950 356 706 208 1166 947 1325 923 1154 507 1124 264 1478 1343 496 961 769 1247 363 251 660 1478 153 467 967 1064 1409 619 1062 949 71 446 709 1274 707 858 568 1451 645 549 354 882 954 1497 687 983