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Computer analysis of Sprouts

Author: David Applegate; Guy J Jacobson; Daniel D Sleator
Publisher: Pittsburgh, Pa. : School of Computer Science, Carnegie Mellon University, [1991]
Series: Research paper (Carnegie Mellon University. School of Computer Science), CMU-CS-91-144.
Edition/Format:   Book : EnglishView all editions and formats
Database:WorldCat
Summary:
Abstract: "Sprouts is a two-player pencil-and-paper game with a topological flavor. It was invented in 1967 by Michael Paterson and John Conway, and was popularized by Martin Gardner in the Mathematical Games column of Scientific American magazine [6]. We have written a computer program to analyze the n-spot game of Sprouts for general n. Our program uses a number of standard techniques to expedite adversary
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Details

Document Type: Book
All Authors / Contributors: David Applegate; Guy J Jacobson; Daniel D Sleator
OCLC Number: 24129940
Notes: "May 1991."
Description: 19 p. : ill. ; 28 cm.
Series Title: Research paper (Carnegie Mellon University. School of Computer Science), CMU-CS-91-144.
Responsibility: David Applegate, Guy Jacobson, Daniel Sleator.

Abstract:

Abstract: "Sprouts is a two-player pencil-and-paper game with a topological flavor. It was invented in 1967 by Michael Paterson and John Conway, and was popularized by Martin Gardner in the Mathematical Games column of Scientific American magazine [6]. We have written a computer program to analyze the n-spot game of Sprouts for general n. Our program uses a number of standard techniques to expedite adversary searches such as cutting off the search as soon as the value can be determined, and hashing previously evaluated positions.

But the truly innovative feature is our representation of game positions, which provides enough information to generate moves and has the property that many different planar graphs collapse into the same representation. This has an enormous impact on the speed of the search. The complexity of n-spot Sprouts grows extremely rapidly with n. According to Gardner [7, page 7], Conway estimated that analysis of the eight-spot game was beyond the reach of present-day computers. Before our program, even the value of the seven-spot game was unknown; we have calculated the value of all games up to and including eleven spots.

Our calculation supports the Sprouts Conjecture: The first player loses if n is 0, 1 or 2 modulo 6 and wins otherwise."

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