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The bridge and torch problem (also known as The Midnight Train [1] and Dangerous crossing [2]) is a logic puzzle that deals with four people, a bridge and a torch. It is in the category of river crossing puzzles, where a number of objects must move across a river, with some constraints. [3]
Hashiwokakero (橋をかけろ Hashi o kakero; lit. "build bridges!") is a type of logic puzzle published by Nikoli. [1] It has also been published in English under the name Bridges or Chopsticks (based on a mistranslation: the hashi of the title, 橋, means bridge; hashi written with another character, 箸, means chopsticks).
Rochester Institute of Technology has incorporated the puzzle into the pavement in front of the Gene Polisseni Center, an ice hockey arena that opened in 2014, [11] and the Georgia Institute of Technology also installed a landscape art model of the seven bridges in 2018. [12] A popular variant of the puzzle is the Bristol Bridges Walk. [13]
Well-known river-crossing puzzles include: The fox, goose, and bag of beans puzzle, in which a farmer must transport a fox, goose and bag of beans from one side of a river to another using a boat which can only hold one item in addition to the farmer, subject to the constraints that the fox cannot be left alone with the goose, and the goose cannot be left alone with the beans.
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Bridge and torch problem: Image title: The two solutions to the bridge and torch puzzle with the vertical axis denoting time, s the start, f the finish, T the torch and other letters as in the Wikipedia article, by CMG Lee. Width: 100%: Height: 100%
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The Bristol Bridges Walk is a circular hiking route that is linked to the Königsberg bridge problem, a mathematical puzzle which laid the foundation for graph theory, the mathematical study of networks. [2] [3] [4] The walk presents a solution of the puzzle for the city of Bristol. [5]